hi everyone, i am a new feflow`s user i am starting to model a mining
area with aprox. 232000 Ha
I can not import the data file of the surfaces, i have tried but it
was not possible. The data file weigh 323579 Kbytes and contain 4
millions dates in a file X,Y,Z (*.dat*) from Surfer, is it possible
that the problem can be the data file because is too large?, what is
the maxim capacity in order to allow load the surfaces?
thank you in advance,
tatiana
Because of the broad interest I've put Kumar's report on our ftp
server for convenient download:
ftp://ftp.wasy.de/FEFLOW/Goa.pdf
Best regards,
Peter Schätzl
WASY GmbH
Dear Member,
This is just to inform that complete report of my
study "Modelling of a Coastal Aquifer using FEFLOW"
can be downloaded at the following link -
ftp://ftp.wasy.de/FEFLOW/Goa.pdf
I am grateful to WASY Support team for helping in my
study and uploading my report at their server.
Regards
Kumar
================================================
C. P. KUMAR
Scientist 'E1'
National Institute of Hydrology
Jal Vigyan Bhawan
Roorkee - 247667 (Uttarakhand)
INDIA
Web Page : http://www.angelfire.com/nh/cpkumar/
================================================
Unfold the Goddess Within:
http://groups.yahoo.com/group/Shambhavi/
================================================
Dear C P Kumar,
After going through your research abstract I am interested to have the complete
report and the results. It will be very interesting for me if you can send me
the same.
Waiting for your reply.
Sincerely,
Tapas Karmaker, M.Tech.
----- Original Message ----
From: C. P. Kumar <cpkumar@...>
To: hydforum@yahoogroups.com; hydrologymodel@...;
gwmodel@yahoogroups.com; gwrm@...; rhydrology@yahoogroups.com;
feflow@...; seawat@...; coastal@googlegroups.com
Sent: Sunday, April 29, 2007 11:12:54 AM
Subject: [feflow] Modelling of seawater intrusion using FEFLOW
Dear Member,
I am pleased to inform that I have recently completed
the study "Modelling of a Coastal Aquifer using
FEFLOW". A brief introduction of the study is given
below.
Coastal tracts of Goa (India) are rapidly being
transformed into settlement areas. The poor water
supply facilities have encouraged people to have their
own source of water by digging or boring a well.
During the last decade, there have been large-scale
withdrawals of groundwater by builders, hotels and
other tourist establishments. Though the seawater
intrusion has not yet assumed serious magnitude, but
in the coming years it may turn to be a major problem
if corrective measures are not initiated at this
stage. It is necessary to understand how fresh and
salt water move under various realistic pumping and
recharge scenarios. Objectives of the study include
simulation of seawater intrusion in a part of the
coastal area in Bardez taluk of North Goa, evaluation
of the impact on seawater intrusion due to various
groundwater pumping scenarios and sensitivity analysis
to find the most sensitive parameters affecting the
simulation.
For the study, a finite-element model (FEFLOW) was
used for model simulations. The FEFLOW is an
interactive finite element simulation system (Version
5.1) for three-dimensional (3D) or two-dimensional
(2D), i.e. horizontal (aquifer-averaged) , vertical or
axi-symmetric, transient or steady-state, fluid
density- coupled or linear, flow and mass, flow and
heat or completely coupled thermohaline transport
processes in subsurface water resources (groundwater
systems).
Salient conclusions of the study are given below.
(1) Presently, seawater intrusion in Bardez taluk of
North Goa is confined only upto 290 m from the coast
under normal rainfall conditions and present draft
pattern. It may slightly extend farther for low
rainfall years.
(2) Seawater intrusion may further advance inland if
withdrawals of groundwater by builders, hotels and
other tourist establishments continue to increase in
the coming years.
(3) Groundwater salinity needs to be continuously
monitored near the coastal area, especially within 2
km from the coast.
(4) Corrective measures with proper planning and
management of groundwater resources in the area need
to be initiated so that it may not turn to be a major
water quality problem in the coming times.
(5) The model is very sensitive to hydraulic
conductivity and dispersivity values. Field and
laboratory investigations need to be undertaken for
measurement of these parameters for use in further
modelling studies.
(6) The study will guide in making management
decisions to monitor and control seawater intrusion
and planning of groundwater development in the area.
I can send the complete report (in pdf format) by
e-mail to the interested persons. Your comments or
suggestions are welcome.
Regards
Kumar
============ ========= ========= ========= =========
C. P. KUMAR
Scientist 'E1'
National Institute of Hydrology
Jal Vigyan Bhawan
Roorkee - 247667 (Uttarakhand)
INDIA
Web Page : http://www.angelfir e.com/nh/ cpkumar/
============ ========= ========= ========= =========
Unfold the Goddess Within:
http://groups. yahoo.com/ group/Shambhavi/
============ ========= ========= ========= =========
Dear Member,
I am pleased to inform that I have recently completed
the study "Modelling of a Coastal Aquifer using
FEFLOW". A brief introduction of the study is given
below.
Coastal tracts of Goa (India) are rapidly being
transformed into settlement areas. The poor water
supply facilities have encouraged people to have their
own source of water by digging or boring a well.
During the last decade, there have been large-scale
withdrawals of groundwater by builders, hotels and
other tourist establishments. Though the seawater
intrusion has not yet assumed serious magnitude, but
in the coming years it may turn to be a major problem
if corrective measures are not initiated at this
stage. It is necessary to understand how fresh and
salt water move under various realistic pumping and
recharge scenarios. Objectives of the study include
simulation of seawater intrusion in a part of the
coastal area in Bardez taluk of North Goa, evaluation
of the impact on seawater intrusion due to various
groundwater pumping scenarios and sensitivity analysis
to find the most sensitive parameters affecting the
simulation.
For the study, a finite-element model (FEFLOW) was
used for model simulations. The FEFLOW is an
interactive finite element simulation system (Version
5.1) for three-dimensional (3D) or two-dimensional
(2D), i.e. horizontal (aquifer-averaged), vertical or
axi-symmetric, transient or steady-state, fluid
density- coupled or linear, flow and mass, flow and
heat or completely coupled thermohaline transport
processes in subsurface water resources (groundwater
systems).
Salient conclusions of the study are given below.
(1) Presently, seawater intrusion in Bardez taluk of
North Goa is confined only upto 290 m from the coast
under normal rainfall conditions and present draft
pattern. It may slightly extend farther for low
rainfall years.
(2) Seawater intrusion may further advance inland if
withdrawals of groundwater by builders, hotels and
other tourist establishments continue to increase in
the coming years.
(3) Groundwater salinity needs to be continuously
monitored near the coastal area, especially within 2
km from the coast.
(4) Corrective measures with proper planning and
management of groundwater resources in the area need
to be initiated so that it may not turn to be a major
water quality problem in the coming times.
(5) The model is very sensitive to hydraulic
conductivity and dispersivity values. Field and
laboratory investigations need to be undertaken for
measurement of these parameters for use in further
modelling studies.
(6) The study will guide in making management
decisions to monitor and control seawater intrusion
and planning of groundwater development in the area.
I can send the complete report (in pdf format) by
e-mail to the interested persons. Your comments or
suggestions are welcome.
Regards
Kumar
================================================
C. P. KUMAR
Scientist 'E1'
National Institute of Hydrology
Jal Vigyan Bhawan
Roorkee - 247667 (Uttarakhand)
INDIA
Web Page : http://www.angelfire.com/nh/cpkumar/
================================================
Unfold the Goddess Within:
http://groups.yahoo.com/group/Shambhavi/
================================================
Lenin,
For optimisation, just try to constrant pumping well by water level in the
well using feflow. It should give you the correct answer about pumping rate
and position.
Regards
Michael Verreault, ing., M.Sc.A.
Hydrogéologue
Resp. Hydrogéologie et Environnement
Les Laboratoires SL inc.
1309, blv. St-Paul
Chicoutimi (QC) G7J 3Y2
Tel: 418-698-6827
Fax: 418-543-6812
Lenin,
you can do that with the parameter estimator of Modflow or Feflow as well
ciao
gio
2007/4/17, lenin kalyanasundaram <leninks_1979@...>:
>
> Hello,
>
> My study area has sea water intrusion problem as it is located on the sea
> coast. So, in order to minimise/prevent the effect of this i need to
> optimise the pumping rate, pumping location, recharge rate (artificial
> recharge location & rate).
>
> i hope thi will give better idea, if u want any other details, send me
> mail.
>
>
> with regards
> lenin
>
>
> Giovanni <g.firmani@...> wrote:
>
> Lenin,
>
> I didnt quite understand the type of optmization you have to study, by the
> way I suggest you to give a look to this link:
>
> http://www.eng.buffalo.edu/groundwater/software/software.html
>
> it contains some interesting free groundwater software programs. In
> particular you can find a parameter estimation program called Ostrich that
> is very powerful. The web page provides you the user guides as well.
>
> Ciao
> Gio
>
> 2007/4/15, lenin kalyanasundaram <leninks_1979@...>:
> >
> > Dear Members,
> >
> > i am doing research on ground water optimization for coastal region. i
> > need to optimize pumping rate, etc..,. so i want any GW optimization
> program
> > with source code to learn and understand. Please share your ideas and
> help
> > me in this regard. if you have any query do mail me.
> >
> > With Regards
> > Lenin
> > Reserach Scholar
> > Anna University
> > Chennai
Hello,
My study area has sea water intrusion problem as it is located on the sea coast.
So, in order to minimise/prevent the effect of this i need to optimise the
pumping rate, pumping location, recharge rate (artificial recharge location &
rate).
i hope thi will give better idea, if u want any other details, send me mail.
with regards
lenin
Giovanni <g.firmani@...> wrote:
Lenin,
I didnt quite understand the type of optmization you have to study, by the way I
suggest you to give a look to this link:
http://www.eng.buffalo.edu/groundwater/software/software.html
it contains some interesting free groundwater software programs. In
particular you can find a parameter estimation program called Ostrich that is
very powerful. The web page provides you the user guides as well.
Ciao
Gio
2007/4/15, lenin kalyanasundaram <leninks_1979@...>:
>
> Dear Members,
>
> i am doing research on ground water optimization for coastal region. i
> need to optimize pumping rate, etc..,. so i want any GW optimization program
> with source code to learn and understand. Please share your ideas and help
> me in this regard. if you have any query do mail me.
>
> With Regards
> Lenin
> Reserach Scholar
> Anna University
> Chennai
Lenin,
I didnt quite understand the type of optmization you have to study, by the way I
suggest you to give a look to this link:
http://www.eng.buffalo.edu/groundwater/software/software.html
it contains some interesting free groundwater software programs. In
particular you can find a parameter estimation program called Ostrich that is
very powerful. The web page provides you the user guides as well.
Ciao
Gio
2007/4/15, lenin kalyanasundaram <leninks_1979@...>:
>
> Dear Members,
>
> i am doing research on ground water optimization for coastal region. i
> need to optimize pumping rate, etc..,. so i want any GW optimization program
> with source code to learn and understand. Please share your ideas and help
> me in this regard. if you have any query do mail me.
>
> With Regards
> Lenin
> Reserach Scholar
> Anna University
> Chennai
MODFLOW have a special version that may suit your purpose. Please check the usgs
website, I think it is called GWM.
http://pubs.usgs.gov/of/2005/1072/
Regards
Jinhui
From: feflow@... [mailto:feflow@...] On Behalf
Of lenin kalyanasundaram
Sent: 2007Äê4ÔÂ15ÈÕ 20:12
To: gwmodel; hydforum; seawat; visual-modflow; feflow
Subject: [feflow] Help source code for ground water optimization - Reg
Dear Members,
i am doing research on ground water optimization for coastal region. i need
to optimize pumping rate, etc..,. so i want any GW optimization program with
source code to learn and understand. Please share your ideas and help me in
this regard. if you have any query do mail me.
With Regards
Lenin
Reserach Scholar
Anna University
Chennai
Dear Members,
i am doing research on ground water optimization for coastal region. i need to
optimize pumping rate, etc..,. so i want any GW optimization program with source
code to learn and understand. Please share your ideas and help me in this
regard. if you have any query do mail me.
With Regards
Lenin
Reserach Scholar
Anna University
Chennai
I would like to apologize for the last email I sent. I noticed a stupid
thing I have done in the model. The fixed constant head I assigned for
the drain is lower that the constant heads of the upstream and
downstream BC for this reason the sum of the fluxes from these borders
are equal to the total flux in the model.
Please forgive me ,,, I am a new user of the program :)
Thank you for the attention
Giovanni Firmani
Dear all
I am a new feflow user ! I hope you can help me.
I am currently using the version 5.2 installed in a pc with win XP SP2.
I am trying to test the reliability of the "budget analyser" with a very
simple model. I have attached the following model:
Dimension of the domain: 2D vertical
B.C. :constant Head (30 m) upstream , costant head (28m) downstream, a
drainage modelled as a costant head (25 m) in the middle of the domain
I would like to evaluate the flux I can extract from the drain. Using the
budget analyser I have got the absolute value of 226.16 m3/day for the in
and out flux. then I used the fluid flux analyser in order to get the flux
upstream and downstream . the values are rispectively 144.185 m3/day
(positive) and 81.977 m3/day (negative). For the upstream BC I was expecting
the same value I have got with the budget analyser why is it different? Is I
sum the two previous values I obtai exactly 226.16 m3/day, how is it
possible?
if you have any idea please let me know
Kind regards
Giovanni
When I make a back ground in femap of feflow , I get some troubles.
1. I launch feflow map assistant,then open a .bmp format file .
2. define the image coordinates in four points; typing the image
coordinates in the corresponding fields of the reference points table.
3. Click on the "Register" button; Click on the "Rectify" button.
4. a black board pops up,nothing on the picture.
5. I save this picture in .tif,then I open it in the feflow by
quick access load map,still I can¡¯t see the background,only black
board .
Who can explain this ,thanks
Hi to everybody!
I am attending the first official course of FEFLOW in Italy (Ferrara)
organized by WASY. With the other attendees we decided to create a new
italian FEFLOW mailing list. If you are italian and you want to
discuss about that program , join our first italian Feflow group:
feflow_italy@...
Kind regards
Giovanni Firmani
Hi,
1. Both can be done, you can assign initial hydraulic
head or topography, but I usually put topography.
2. No, you do not have to define initial hydraulic
head as different slice, just go...
Regards
Nanda Rinaldi
--- "C. P. Kumar" <cpkumar@...> wrote:
> Dear little willow,
>
> Thank you very much for your kind response and
> suggestions. It makes
> the things more clear to me. I understand that I
> have two options -
>
> (1) Assign elevations of initial hydraulic heads as
> Slice 1 (Free &
> movable). But in that case whether topography of the
> area will not be
> accounted in the simulations?
>
> (2) Assign topographic elevations of ground level as
> Slice 1
> as "Phreatic" (not sure if I am correct). In this
> case, whether
> initial hydraulic heads also need to be defined as
> another slice or
> they can automatically be accounted by initial flow
> conditions?
>
> Regards
> Kumar
>
>
> --- In feflow@..., little willow
> <little_willow71@...>
> wrote:
> >
> > Hi,
> >
> > It looks like that if the water table inside the
> first
> > layer is a 'strong' condition, then a moving mesh
> > according to water table can be used. Assigning
> > topography to the surface layer and assigning
> phreatic
> > surface can also be defined. If you assigned river
> > boundary just a bit below the height of topography
> > then obviously your problem become phreatic.
> > In general, phreatic surface is used in your case.
> >
> >
> > --- Tapas Karmaker <tapas_karmaker@...> wrote:
> >
> > > Dear Mr. Kumar,
> > >
> > > I have same type of problem. I assined top layer
> as
> > > Phreatic. You may not assign any boundary
> condition
> > > at the top layer.
> > >
> > > Sincerely,
> > >
> > > Tapas
> > >
> > >
> > > ----- Original Message ----
> > > From: C. P. Kumar <cpkumar@...>
> > > To: feflow@...
> > > Sent: Wednesday, January 24, 2007 11:50:37 AM
> > > Subject: [feflow] FEFLOW Model Setup Query
> > >
> > > Dear Group Member,
> > >
> > > I have few queries regarding model setup for
> FEFLOW.
> > >
> > >
> > > (1) To model unconfined coastal aquifer with two
> > > layers (top sand and
> > > bottom clay), I have prepared the following
> files:
> > >
> > > relief.trp - topographic elevations of ground
> level
> > > sand.trp - elevations of bottom of sand layer
> > > clay.trp - elevations of bottom of clay layer
> > >
> > > The groundwater lies in the top sand layer
> (around
> > > 15 m thick) which
> > > lies above the clay layer (around 1 - 2 m
> thick).
> > > With these two
> > > layers, I understand that Slice 2 and Slice 3
> can be
> > > assigned
> > > as "Fixed" slices but I am not sure about the
> top
> > > Slice 1.
> > >
> > > Can we assign relief.trp (topographic elevations
> of
> > > ground level) as
> > > Slice 1 - if yes, then should it be "Free &
> movable"
> > > or "Phreatic"
> > > (though actually it is fixed stratigraphic
> unit)? In
> > > that case,
> > > should flow initials (hydraulic head) should be
> > > assigned to Slice 1
> > > also (similar to Slice 2 & 3)?
> > >
> > > Can we assign elevations of initial hydraulic
> heads
> > > as Slice 1 (Free
> > > & movable) - in that case whether topographic
> > > elevations (relief.trp)
> > > are not required in the simulations?
> > >
> > > (2) The mesh is generated in two-dimensional
> plane
> > > and the third
> > > dimension is accounted by layers. Then how is
> > > vertical discretization
> > > accounted by the model? How can we get the
> vertical
> > > distribution of
> > > mass concentration values within a layer?
> > >
> > > I shall be grateful for any suggestions from the
> > > learned members in
> > > this group.
> > >
> > > Thanks & Regards
> > > Kumar
> > > ============ ========= ========= =========
> =========
> > > C. P. KUMAR
> > > Scientist 'E1'
> > > National Institute of Hydrology
> > > Jal Vigyan Bhawan
> > > Roorkee - 247667 (Uttaranchal)
> > > INDIA
> > >
> > > Web Page : http://www.angelfir e.com/nh/
> cpkumar/
> > > ============ ========= ========= =========
> =========
Dear mr Kumar,
The top of slice 1 could be assign by using your relief.trp file. You
could use free&movable for slice 1.
Your initial flow Hydraulic head could be the same for your two layers,
then you could assign the same initial flow for each slice.
you could use for slice 1 (top) free&movable , slice 2 undefined, slice
3 fixed
regards
Thierry BONTEMPS
Project Manager - Civil & Environmental Technologies Dpt
TRACTEBEL DEVELOPMENT ENGINEERING S.A.
---------------------------------------------------
Avenue Jean Monnet 1 - B 1348 Louvain-la-Neuve - BELGIUM
tel. + 32 10 477 830 - fax + 32 10 477 819
mailto:thierry.bontemps@...
<mailto:thierry.bontemps@...>
www.tde.tractebel.com <http://www.tde.tractebel.com/>
________________________________
From: feflow@... [mailto:feflow@...] On
Behalf Of C. P. Kumar
Sent: mercredi 24 janvier 2007 07:21
To: feflow@...
Subject: [feflow] FEFLOW Model Setup Query
Dear Group Member,
I have few queries regarding model setup for FEFLOW.
(1) To model unconfined coastal aquifer with two layers (top sand and
bottom clay), I have prepared the following files:
relief.trp - topographic elevations of ground level
sand.trp - elevations of bottom of sand layer
clay.trp - elevations of bottom of clay layer
The groundwater lies in the top sand layer (around 15 m thick) which
lies above the clay layer (around 1 - 2 m thick). With these two
layers, I understand that Slice 2 and Slice 3 can be assigned
as "Fixed" slices but I am not sure about the top Slice 1.
Can we assign relief.trp (topographic elevations of ground level) as
Slice 1 - if yes, then should it be "Free & movable" or "Phreatic"
(though actually it is fixed stratigraphic unit)? In that case,
should flow initials (hydraulic head) should be assigned to Slice 1
also (similar to Slice 2 & 3)?
Can we assign elevations of initial hydraulic heads as Slice 1 (Free
& movable) - in that case whether topographic elevations (relief.trp)
are not required in the simulations?
(2) The mesh is generated in two-dimensional plane and the third
dimension is accounted by layers. Then how is vertical discretization
accounted by the model? How can we get the vertical distribution of
mass concentration values within a layer?
I shall be grateful for any suggestions from the learned members in
this group.
Thanks & Regards
Kumar
================================================
C. P. KUMAR
Scientist 'E1'
National Institute of Hydrology
Jal Vigyan Bhawan
Roorkee - 247667 (Uttaranchal)
INDIA
Web Page : http://www.angelfire.com/nh/cpkumar/
<http://www.angelfire.com/nh/cpkumar/>
================================================
Dear Mr. Kumar,
as I understand it, you should use the option "Free & movable" if you don't mind
remembering where the topographic surface is: FEFLOW will move the first slice
down according to the actual position of the water table, given that you're
simulating saturated flow only. I think topography won't be taken into account.
Using "Phreatic", FEFLOW leaves the slice on the same vertical position you set
it initially (unless it goes over the top, in that case you can choose to let
FEFLOW change the layer to "confined" or let the layer expand over the
topographic surface).
Both cases should require initial heads to be assigned by the same way and
without adding any other slice.
Hope I've helped you,
kind regards
Giovanni Formentin
G.E.CO. snc
Legnano - Italy
----- Original Message -----
From: C. P. Kumar
To: feflow@...
Sent: Thursday, January 25, 2007 11:56 AM
Subject: [feflow] Re: FEFLOW Model Setup Query
Dear little willow,
Thank you very much for your kind response and suggestions. It makes
the things more clear to me. I understand that I have two options -
(1) Assign elevations of initial hydraulic heads as Slice 1 (Free &
movable). But in that case whether topography of the area will not be
accounted in the simulations?
(2) Assign topographic elevations of ground level as Slice 1
as "Phreatic" (not sure if I am correct). In this case, whether
initial hydraulic heads also need to be defined as another slice or
they can automatically be accounted by initial flow conditions?
Regards
Kumar
--- In feflow@..., little willow <little_willow71@...>
wrote:
>
> Hi,
>
> It looks like that if the water table inside the first
> layer is a 'strong' condition, then a moving mesh
> according to water table can be used. Assigning
> topography to the surface layer and assigning phreatic
> surface can also be defined. If you assigned river
> boundary just a bit below the height of topography
> then obviously your problem become phreatic.
> In general, phreatic surface is used in your case.
>
>
> --- Tapas Karmaker <tapas_karmaker@...> wrote:
>
> > Dear Mr. Kumar,
> >
> > I have same type of problem. I assined top layer as
> > Phreatic. You may not assign any boundary condition
> > at the top layer.
> >
> > Sincerely,
> >
> > Tapas
> >
> >
> > ----- Original Message ----
> > From: C. P. Kumar <cpkumar@...>
> > To: feflow@...
> > Sent: Wednesday, January 24, 2007 11:50:37 AM
> > Subject: [feflow] FEFLOW Model Setup Query
> >
> > Dear Group Member,
> >
> > I have few queries regarding model setup for FEFLOW.
> >
> >
> > (1) To model unconfined coastal aquifer with two
> > layers (top sand and
> > bottom clay), I have prepared the following files:
> >
> > relief.trp - topographic elevations of ground level
> > sand.trp - elevations of bottom of sand layer
> > clay.trp - elevations of bottom of clay layer
> >
> > The groundwater lies in the top sand layer (around
> > 15 m thick) which
> > lies above the clay layer (around 1 - 2 m thick).
> > With these two
> > layers, I understand that Slice 2 and Slice 3 can be
> > assigned
> > as "Fixed" slices but I am not sure about the top
> > Slice 1.
> >
> > Can we assign relief.trp (topographic elevations of
> > ground level) as
> > Slice 1 - if yes, then should it be "Free & movable"
> > or "Phreatic"
> > (though actually it is fixed stratigraphic unit)? In
> > that case,
> > should flow initials (hydraulic head) should be
> > assigned to Slice 1
> > also (similar to Slice 2 & 3)?
> >
> > Can we assign elevations of initial hydraulic heads
> > as Slice 1 (Free
> > & movable) - in that case whether topographic
> > elevations (relief.trp)
> > are not required in the simulations?
> >
> > (2) The mesh is generated in two-dimensional plane
> > and the third
> > dimension is accounted by layers. Then how is
> > vertical discretization
> > accounted by the model? How can we get the vertical
> > distribution of
> > mass concentration values within a layer?
> >
> > I shall be grateful for any suggestions from the
> > learned members in
> > this group.
> >
> > Thanks & Regards
> > Kumar
> > ============ ========= ========= ========= =========
> > C. P. KUMAR
> > Scientist 'E1'
> > National Institute of Hydrology
> > Jal Vigyan Bhawan
> > Roorkee - 247667 (Uttaranchal)
> > INDIA
> >
> > Web Page : http://www.angelfir e.com/nh/ cpkumar/
> > ============ ========= ========= ========= =========
Dear little willow,
Thank you very much for your kind response and suggestions. It makes
the things more clear to me. I understand that I have two options -
(1) Assign elevations of initial hydraulic heads as Slice 1 (Free &
movable). But in that case whether topography of the area will not be
accounted in the simulations?
(2) Assign topographic elevations of ground level as Slice 1
as "Phreatic" (not sure if I am correct). In this case, whether
initial hydraulic heads also need to be defined as another slice or
they can automatically be accounted by initial flow conditions?
Regards
Kumar
--- In feflow@..., little willow <little_willow71@...>
wrote:
>
> Hi,
>
> It looks like that if the water table inside the first
> layer is a 'strong' condition, then a moving mesh
> according to water table can be used. Assigning
> topography to the surface layer and assigning phreatic
> surface can also be defined. If you assigned river
> boundary just a bit below the height of topography
> then obviously your problem become phreatic.
> In general, phreatic surface is used in your case.
>
>
> --- Tapas Karmaker <tapas_karmaker@...> wrote:
>
> > Dear Mr. Kumar,
> >
> > I have same type of problem. I assined top layer as
> > Phreatic. You may not assign any boundary condition
> > at the top layer.
> >
> > Sincerely,
> >
> > Tapas
> >
> >
> > ----- Original Message ----
> > From: C. P. Kumar <cpkumar@...>
> > To: feflow@...
> > Sent: Wednesday, January 24, 2007 11:50:37 AM
> > Subject: [feflow] FEFLOW Model Setup Query
> >
> > Dear Group Member,
> >
> > I have few queries regarding model setup for FEFLOW.
> >
> >
> > (1) To model unconfined coastal aquifer with two
> > layers (top sand and
> > bottom clay), I have prepared the following files:
> >
> > relief.trp - topographic elevations of ground level
> > sand.trp - elevations of bottom of sand layer
> > clay.trp - elevations of bottom of clay layer
> >
> > The groundwater lies in the top sand layer (around
> > 15 m thick) which
> > lies above the clay layer (around 1 - 2 m thick).
> > With these two
> > layers, I understand that Slice 2 and Slice 3 can be
> > assigned
> > as "Fixed" slices but I am not sure about the top
> > Slice 1.
> >
> > Can we assign relief.trp (topographic elevations of
> > ground level) as
> > Slice 1 - if yes, then should it be "Free & movable"
> > or "Phreatic"
> > (though actually it is fixed stratigraphic unit)? In
> > that case,
> > should flow initials (hydraulic head) should be
> > assigned to Slice 1
> > also (similar to Slice 2 & 3)?
> >
> > Can we assign elevations of initial hydraulic heads
> > as Slice 1 (Free
> > & movable) - in that case whether topographic
> > elevations (relief.trp)
> > are not required in the simulations?
> >
> > (2) The mesh is generated in two-dimensional plane
> > and the third
> > dimension is accounted by layers. Then how is
> > vertical discretization
> > accounted by the model? How can we get the vertical
> > distribution of
> > mass concentration values within a layer?
> >
> > I shall be grateful for any suggestions from the
> > learned members in
> > this group.
> >
> > Thanks & Regards
> > Kumar
> > ============ ========= ========= ========= =========
> > C. P. KUMAR
> > Scientist 'E1'
> > National Institute of Hydrology
> > Jal Vigyan Bhawan
> > Roorkee - 247667 (Uttaranchal)
> > INDIA
> >
> > Web Page : http://www.angelfir e.com/nh/ cpkumar/
> > ============ ========= ========= ========= =========
>
Hi,
It looks like that if the water table inside the first
layer is a 'strong' condition, then a moving mesh
according to water table can be used. Assigning
topography to the surface layer and assigning phreatic
surface can also be defined. If you assigned river
boundary just a bit below the height of topography
then obviously your problem become phreatic.
In general, phreatic surface is used in your case.
--- Tapas Karmaker <tapas_karmaker@...> wrote:
> Dear Mr. Kumar,
>
> I have same type of problem. I assined top layer as
> Phreatic. You may not assign any boundary condition
> at the top layer.
>
> Sincerely,
>
> Tapas
>
>
> ----- Original Message ----
> From: C. P. Kumar <cpkumar@...>
> To: feflow@...
> Sent: Wednesday, January 24, 2007 11:50:37 AM
> Subject: [feflow] FEFLOW Model Setup Query
>
> Dear Group Member,
>
> I have few queries regarding model setup for FEFLOW.
>
>
> (1) To model unconfined coastal aquifer with two
> layers (top sand and
> bottom clay), I have prepared the following files:
>
> relief.trp - topographic elevations of ground level
> sand.trp - elevations of bottom of sand layer
> clay.trp - elevations of bottom of clay layer
>
> The groundwater lies in the top sand layer (around
> 15 m thick) which
> lies above the clay layer (around 1 - 2 m thick).
> With these two
> layers, I understand that Slice 2 and Slice 3 can be
> assigned
> as "Fixed" slices but I am not sure about the top
> Slice 1.
>
> Can we assign relief.trp (topographic elevations of
> ground level) as
> Slice 1 - if yes, then should it be "Free & movable"
> or "Phreatic"
> (though actually it is fixed stratigraphic unit)? In
> that case,
> should flow initials (hydraulic head) should be
> assigned to Slice 1
> also (similar to Slice 2 & 3)?
>
> Can we assign elevations of initial hydraulic heads
> as Slice 1 (Free
> & movable) - in that case whether topographic
> elevations (relief.trp)
> are not required in the simulations?
>
> (2) The mesh is generated in two-dimensional plane
> and the third
> dimension is accounted by layers. Then how is
> vertical discretization
> accounted by the model? How can we get the vertical
> distribution of
> mass concentration values within a layer?
>
> I shall be grateful for any suggestions from the
> learned members in
> this group.
>
> Thanks & Regards
> Kumar
> ============ ========= ========= ========= =========
> C. P. KUMAR
> Scientist 'E1'
> National Institute of Hydrology
> Jal Vigyan Bhawan
> Roorkee - 247667 (Uttaranchal)
> INDIA
>
> Web Page : http://www.angelfir e.com/nh/ cpkumar/
> ============ ========= ========= ========= =========
Dear Mr. Kumar,
I have same type of problem. I assined top layer as Phreatic. You may not assign
any boundary condition at the top layer.
Sincerely,
Tapas
----- Original Message ----
From: C. P. Kumar <cpkumar@...>
To: feflow@...
Sent: Wednesday, January 24, 2007 11:50:37 AM
Subject: [feflow] FEFLOW Model Setup Query
Dear Group Member,
I have few queries regarding model setup for FEFLOW.
(1) To model unconfined coastal aquifer with two layers (top sand and
bottom clay), I have prepared the following files:
relief.trp - topographic elevations of ground level
sand.trp - elevations of bottom of sand layer
clay.trp - elevations of bottom of clay layer
The groundwater lies in the top sand layer (around 15 m thick) which
lies above the clay layer (around 1 - 2 m thick). With these two
layers, I understand that Slice 2 and Slice 3 can be assigned
as "Fixed" slices but I am not sure about the top Slice 1.
Can we assign relief.trp (topographic elevations of ground level) as
Slice 1 - if yes, then should it be "Free & movable" or "Phreatic"
(though actually it is fixed stratigraphic unit)? In that case,
should flow initials (hydraulic head) should be assigned to Slice 1
also (similar to Slice 2 & 3)?
Can we assign elevations of initial hydraulic heads as Slice 1 (Free
& movable) - in that case whether topographic elevations (relief.trp)
are not required in the simulations?
(2) The mesh is generated in two-dimensional plane and the third
dimension is accounted by layers. Then how is vertical discretization
accounted by the model? How can we get the vertical distribution of
mass concentration values within a layer?
I shall be grateful for any suggestions from the learned members in
this group.
Thanks & Regards
Kumar
============ ========= ========= ========= =========
C. P. KUMAR
Scientist 'E1'
National Institute of Hydrology
Jal Vigyan Bhawan
Roorkee - 247667 (Uttaranchal)
INDIA
Web Page : http://www.angelfir e.com/nh/ cpkumar/
============ ========= ========= ========= =========
Dear Group Member,
I have few queries regarding model setup for FEFLOW.
(1) To model unconfined coastal aquifer with two layers (top sand and
bottom clay), I have prepared the following files:
relief.trp - topographic elevations of ground level
sand.trp - elevations of bottom of sand layer
clay.trp - elevations of bottom of clay layer
The groundwater lies in the top sand layer (around 15 m thick) which
lies above the clay layer (around 1 - 2 m thick). With these two
layers, I understand that Slice 2 and Slice 3 can be assigned
as "Fixed" slices but I am not sure about the top Slice 1.
Can we assign relief.trp (topographic elevations of ground level) as
Slice 1 - if yes, then should it be "Free & movable" or "Phreatic"
(though actually it is fixed stratigraphic unit)? In that case,
should flow initials (hydraulic head) should be assigned to Slice 1
also (similar to Slice 2 & 3)?
Can we assign elevations of initial hydraulic heads as Slice 1 (Free
& movable) - in that case whether topographic elevations (relief.trp)
are not required in the simulations?
(2) The mesh is generated in two-dimensional plane and the third
dimension is accounted by layers. Then how is vertical discretization
accounted by the model? How can we get the vertical distribution of
mass concentration values within a layer?
I shall be grateful for any suggestions from the learned members in
this group.
Thanks & Regards
Kumar
================================================
C. P. KUMAR
Scientist 'E1'
National Institute of Hydrology
Jal Vigyan Bhawan
Roorkee - 247667 (Uttaranchal)
INDIA
Web Page : http://www.angelfire.com/nh/cpkumar/
================================================
Dear Group Member,
I have a small query regarding FEFLOW simulation. After setting-up
the model for simulating seawater intrusion in Goa coast (India), I
made initial test run for the following mass boundary condition along
the sea -
Mass (1st kind) = 3.5425 e+04 mg/l - Constrained by mass flux: Min. =
0, Max. = 3.5425 e+04 mg/l
Mass transport initials = 0 mg/l throughout the model domain.
Density ratio = 247.975 exp-4
However, with initial test simulation for 7300 days, I found that
many values of mass concentration are negative and many values are
exceeding 3.5425 e+04 mg/l in the model domain. I understand that the
simulated values must lie within 0 and 3.5425 e+04 mg/l (instead of
becoming negative and exceeding maximum).
Can you please suggest what could be the possible error in my model
setup? I shall be grateful for any suggestions from the learned
members in this group. I can send the .fem file if any member is
willing to examine the same.
Thanks & Regards
Kumar
================================================
C. P. KUMAR
Scientist 'E1'
National Institute of Hydrology
Jal Vigyan Bhawan
Roorkee - 247667 (Uttaranchal)
INDIA
Web Page : http://www.angelfire.com/nh/cpkumar/
================================================
Unfold the Goddess Within:
http://groups.yahoo.com/group/Shambhavi/
================================================
I am considering purchasing FEFLOW as part of simulating changes in
flow fields associated with soil compaction. I have the following
questions related to its capability to allow for transient material
property inputs (such as hydraulic conductivity or specific storage).
1) what is the time level at which something like conductivity can
be changed, time-step, stress period?;
2) Are there constraints on the magnitude and/or spatial extent over
which such changes can be applied?
3) With a change in something like conductivity or storage, an
accompanying change in the head field will also need to occur. If
you change the conductivity at the start of a new stress period, how
does the model develop a revised head field? As part of the initial
time-steps or independent somehow?
4) What sort of model instabilities does changing hydraulic
conductivity in a zoned fashion create?
Thanks, I appreciate any feedback
Dear Group Member,
Using FEFLOW (for the first time), I have completed the model setup
for simulation of seawater intrusion in Goa coast (India). For
initial testing, the simulation run worked properly for "Flow Only".
However, for "transient flow and mass transport" simulation, I get
the following error message -
"FEFLOW - Groundwater Simulation System has encountered a problem and
needs to close. We are sorry for the inconveinence."
To rectify the above error, I tried vaious options under "Temporal &
control data" but could get the successful simulation run. Finally,
when I tested with "Density ratio" as zero under "Flow Materials",
the simulation run proceeded properly. It implies that a non-zero
density ratio (247.975 exp-4 given for the present study) for non-
linear coupled simulation is causing the problem.
Can you please suggest how to rectify this problem? I shall be
grateful for any suggestions from the learned members in this group.
I can send the .fem file if any member is willing to examine the same
for any possible errors.
Thanks & Regards
Kumar
================================================
C. P. KUMAR
Scientist 'E1'
National Institute of Hydrology
Jal Vigyan Bhawan
Roorkee - 247667 (Uttaranchal)
INDIA
Web Page : http://www.angelfire.com/nh/cpkumar/
================================================
Unfold the Goddess Within:
http://groups.yahoo.com/group/Shambhavi/
================================================
M Kumar,
Answer about question 1
You can also import most values from shape files (Arc View or Arc info or
Mapinfo (using universal translator)) using ''assing'' ''database''. If you
re unagle to do that, check the structure of a TRP in the tutorial as
previously discussed.
Michael Verreault, ing., M.Sc.A.
Hydrogéologue
Resp. Hydrogéologie et Environnement
Les Laboratoires SL inc.
1309, blv. St-Paul
Chicoutimi (QC) G7J 3Y2
Tel: 418-698-6827
Fax: 418-543-6812
-------Message original-------
De : feflow@...
Date : 12/11/06 05:00:58
A : feflow@...
Sujet : [feflow] Digest Number 10
FEFLOW Users Group
Messages In This Digest (3 Messages)
1.1.
Model Setup for FEFLOW From: C. P. Kumar
1.2.
Re: Model Setup for FEFLOW From: little willow
1.3.
Re: Model Setup for FEFLOW From: Bontemps Thierry
View All Topics | Create New Topic Messages
1.1.
Model Setup for FEFLOW
Posted by: "C. P. Kumar" cpkumar@... cpkumar
Mon Dec 11, 2006 10:27 am
Dear Group Members,
Using FEFLOW (for the first time), I am in the process of model setup
for simulation of seawater intrusion in Goa coast (India). The
relevant details are briefly presented below.
[A] Background for taking-up the Study:
Coastal tracts of Goa (India) are rapidly being transformed into
settlement areas. The poor water supply facilities has encouraged
people to have their own source of water by digging wells. During the
last decade, there have been large-scale withdrawals of groundwater
by builders, hotels and other tourist establishments. Though the
seawater intrusion has not yet assumed serious magnitude, but in the
coming years it may turn to be a major problem if corrective measures
are not initiated at this stage.
[B] Objectives of the Study:
Simulation of seawater intrusion in a region along Goa coast (Bardez
taluk of North Goa); evaluation of the impact on seawater intrusion
due to various groundwater pumping scenarios; sensitivity analysis;
and suggestions for remedial measures.
[C] Laboratory and Field Investigations carried out:
* Identification of 20 observation wells; measurement of monthly
groundwater level data in observation wells (September 2004 to August
2005); collection of bi-monthly groundwater samples during September
2004 to May 2005.
* Based upon the bi-monthly measurements of salinity in laboratory,
groundwater quality in all the observation wells was found to be
reasonably fresh, both in pre- and post-monsoon periods. It can be
attributed to the fact that the transition zone of fresh water-saline
water lies below the shallow open wells (in shallow unconfined
aquifer to a depth of about 10 - 12 m below ground), as evidenced by
vertical electrical soundings.
* Resistivity profiling: Apparent electrical resistivity measured
along four profiles (at 10 m depth plane) from sea coast to 525
meters inland. The seawater mixed zone was witnessed along two
sections in the low lying sandy alluvial areas.
* Vertical electrical sounding: Carried out at 7 monitoring well
locations upto a depth of 20 metres. Only three wells in the study
area show low values of resistivity below 12 metres depth, indicating
the presence of seawater or mixed zone below this depth.
[D] Model Setup:
The study area map (boundary - dxf, rivers - dxf, location of
observation wells - pnt) has been digitized and an initial finite
element mesh has been created for the entire area. Design of slices
and layers (3D model) and flow and transport data (initials,
boundaries, materials) are still to be done. There is mostly single
aquifer system. In low lying areas, it is unconfined aquifer
consisting of sandy loam (upto 15 m) over unfractured hard rock. In
plateau areas, it is confined aquifer - laterite, clay and fractured
hard rock.
[E] MY QUERIES:
1. Many of the input data files for FEFLOW (initial distribution of
hydraulic head and mass concentration, river water levels, well
pumping rates, transmissivity, conductivity, aquifer top and bottom
elevation etc.) are required to be in the trp (ASCII) format. How
these input files are to be created? Whether FEFLOW itself allows
creation of such files or some outside method is needed and how to do
that?
2. There are large number of dugwells in the study area (reported
density = 18 wells/km2, draft rate = 155 to 259 m3/day). However,
locations of these wells (on map) and their actual drafts are not
available. In such case, how well drafts can be incorporated in the
simulations?
3. How to proceed with FEFLOW setup if we intend simulation only in
part of the study area, say upto around 2 to 3 km within the coast
(15 km long), which is more vulnerable to seawater intrusion.
4. How to define boundary condition in the landward side - how far
and what?
5. Any other useful tips for carrying out the above study.
I shall be grateful for any suggestions from the learned members in
this group.
Thanks & Regards
Kumar
================================================
C. P. KUMAR
Scientist 'E1'
National Institute of Hydrology
Jal Vigyan Bhawan
Roorkee - 247667 (Uttaranchal)
INDIA
Web Page : http://www.angelfire.com/nh/cpkumar/
================================================
Unfold the Goddess Within:
http://groups.yahoo.com/group/Shambhavi/
================================================
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Reply to sender | Reply to group | Reply via web post
Messages in this topic (3)
1.2.
Re: Model Setup for FEFLOW
Posted by: "little willow" little_willow71@... little_willow71
Mon Dec 11, 2006 12:15 pm
Hi Kumar,
-yes you can make trp file outside feflow. Just look
at the file format for trp file.
-if you have density of well for an area with average
pumping then you can 'simulate' them as well by
putting them as well boundaries. Of course having fix
coordinates is better
-you have to have a boundary taken from bigger
model(or assumption) for smaller part(nested model)
-be creative to define the boundary, it can be
topographic divide, groundwater divide, river
location, fixed head location or the worst but could
be better, assumption by considering good hydrogeologi
knowledge
-wait to hear from you
bye
LW
--- "C. P. Kumar" <cpkumar@...> wrote:
> Dear Group Members,
>
> Using FEFLOW (for the first time), I am in the
> process of model setup
> for simulation of seawater intrusion in Goa coast
> (India). The
> relevant details are briefly presented below.
>
> [A] Background for taking-up the Study:
>
> Coastal tracts of Goa (India) are rapidly being
> transformed into
> settlement areas. The poor water supply facilities
> has encouraged
> people to have their own source of water by digging
> wells. During the
> last decade, there have been large-scale withdrawals
> of groundwater
> by builders, hotels and other tourist
> establishments. Though the
> seawater intrusion has not yet assumed serious
> magnitude, but in the
> coming years it may turn to be a major problem if
> corrective measures
> are not initiated at this stage.
>
> [B] Objectives of the Study:
>
> Simulation of seawater intrusion in a region along
> Goa coast (Bardez
> taluk of North Goa); evaluation of the impact on
> seawater intrusion
> due to various groundwater pumping scenarios;
> sensitivity analysis;
> and suggestions for remedial measures.
>
> [C] Laboratory and Field Investigations carried out:
>
> * Identification of 20 observation wells;
> measurement of monthly
> groundwater level data in observation wells
> (September 2004 to August
> 2005); collection of bi-monthly groundwater samples
> during September
> 2004 to May 2005.
>
> * Based upon the bi-monthly measurements of salinity
> in laboratory,
> groundwater quality in all the observation wells was
> found to be
> reasonably fresh, both in pre- and post-monsoon
> periods. It can be
> attributed to the fact that the transition zone of
> fresh water-saline
> water lies below the shallow open wells (in shallow
> unconfined
> aquifer to a depth of about 10 - 12 m below ground),
> as evidenced by
> vertical electrical soundings.
>
> * Resistivity profiling: Apparent electrical
> resistivity measured
> along four profiles (at 10 m depth plane) from sea
> coast to 525
> meters inland. The seawater mixed zone was witnessed
> along two
> sections in the low lying sandy alluvial areas.
>
> * Vertical electrical sounding: Carried out at 7
> monitoring well
> locations upto a depth of 20 metres. Only three
> wells in the study
> area show low values of resistivity below 12 metres
> depth, indicating
> the presence of seawater or mixed zone below this
> depth.
>
> [D] Model Setup:
>
> The study area map (boundary - dxf, rivers - dxf,
> location of
> observation wells - pnt) has been digitized and an
> initial finite
> element mesh has been created for the entire area.
> Design of slices
> and layers (3D model) and flow and transport data
> (initials,
> boundaries, materials) are still to be done. There
> is mostly single
> aquifer system. In low lying areas, it is unconfined
> aquifer
> consisting of sandy loam (upto 15 m) over
> unfractured hard rock. In
> plateau areas, it is confined aquifer - laterite,
> clay and fractured
> hard rock.
>
> [E] MY QUERIES:
>
> 1. Many of the input data files for FEFLOW (initial
> distribution of
> hydraulic head and mass concentration, river water
> levels, well
> pumping rates, transmissivity, conductivity, aquifer
> top and bottom
> elevation etc.) are required to be in the trp
> (ASCII) format. How
> these input files are to be created? Whether FEFLOW
> itself allows
> creation of such files or some outside method is
> needed and how to do
> that?
>
> 2. There are large number of dugwells in the study
> area (reported
> density = 18 wells/km2, draft rate = 155 to 259
> m3/day). However,
> locations of these wells (on map) and their actual
> drafts are not
> available. In such case, how well drafts can be
> incorporated in the
> simulations?
>
> 3. How to proceed with FEFLOW setup if we intend
> simulation only in
> part of the study area, say upto around 2 to 3 km
> within the coast
> (15 km long), which is more vulnerable to seawater
> intrusion.
>
> 4. How to define boundary condition in the landward
> side - how far
> and what?
>
> 5. Any other useful tips for carrying out the above
> study.
>
> I shall be grateful for any suggestions from the
> learned members in
> this group.
>
> Thanks & Regards
> Kumar
>
> ================================================
> C. P. KUMAR
> Scientist 'E1'
> National Institute of Hydrology
> Jal Vigyan Bhawan
> Roorkee - 247667 (Uttaranchal)
> INDIA
>
> Web Page : http://www.angelfire.com/nh/cpkumar/
> ================================================
> Unfold the Goddess Within:
> http://groups.yahoo.com/group/Shambhavi/
> ================================================
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Reply to sender | Reply to group | Reply via web post
Messages in this topic (3)
1.3.
Re: Model Setup for FEFLOW
Posted by: "Bontemps Thierry" thierry.bontemps@... tbontemps
Mon Dec 11, 2006 3:02 pm
for your query on dug wells, if you attribute those wells to your first top
layer you can you use in flow material menu the "In/out flow on the top"
button. You have to do the balance between the pumping rate due to those
dugwells with infiltration rate (rain) and infiltration rate due to
irrigation(or other sources).
best regards
Thierry BONTEMPS
Project Manager - Civil & Environmental Technologies Dpt
TRACTEBEL DEVELOPMENT ENGINEERING S.A.
---------------------------------------------------
Avenue Jean Monnet 1 - B 1348 Louvain-la-Neuve - BELGIUM
tel. + 32 10 477 830 - fax + 32 10 477 819
mailto:thierry.bontemps@... <mailto:thierry.bontemps@tractebel
com>
www.tde.tractebel.com <http://www.tde.tractebel.com/>
________________________________
From: feflow@... [mailto:feflow@...] On Behalf
Of C. P. Kumar
Sent: lundi 11 décembre 2006 05:50
To: feflow@...
Subject: [feflow] Model Setup for FEFLOW
Dear Group Members,
Using FEFLOW (for the first time), I am in the process of model setup
for simulation of seawater intrusion in Goa coast (India). The
relevant details are briefly presented below.
[A] Background for taking-up the Study:
Coastal tracts of Goa (India) are rapidly being transformed into
settlement areas. The poor water supply facilities has encouraged
people to have their own source of water by digging wells. During the
last decade, there have been large-scale withdrawals of groundwater
by builders, hotels and other tourist establishments. Though the
seawater intrusion has not yet assumed serious magnitude, but in the
coming years it may turn to be a major problem if corrective measures
are not initiated at this stage.
[B] Objectives of the Study:
Simulation of seawater intrusion in a region along Goa coast (Bardez
taluk of North Goa); evaluation of the impact on seawater intrusion
due to various groundwater pumping scenarios; sensitivity analysis;
and suggestions for remedial measures.
[C] Laboratory and Field Investigations carried out:
* Identification of 20 observation wells; measurement of monthly
groundwater level data in observation wells (September 2004 to August
2005); collection of bi-monthly groundwater samples during September
2004 to May 2005.
* Based upon the bi-monthly measurements of salinity in laboratory,
groundwater quality in all the observation wells was found to be
reasonably fresh, both in pre- and post-monsoon periods. It can be
attributed to the fact that the transition zone of fresh water-saline
water lies below the shallow open wells (in shallow unconfined
aquifer to a depth of about 10 - 12 m below ground), as evidenced by
vertical electrical soundings.
* Resistivity profiling: Apparent electrical resistivity measured
along four profiles (at 10 m depth plane) from sea coast to 525
meters inland. The seawater mixed zone was witnessed along two
sections in the low lying sandy alluvial areas.
* Vertical electrical sounding: Carried out at 7 monitoring well
locations upto a depth of 20 metres. Only three wells in the study
area show low values of resistivity below 12 metres depth, indicating
the presence of seawater or mixed zone below this depth.
[D] Model Setup:
The study area map (boundary - dxf, rivers - dxf, location of
observation wells - pnt) has been digitized and an initial finite
element mesh has been created for the entire area. Design of slices
and layers (3D model) and flow and transport data (initials,
boundaries, materials) are still to be done. There is mostly single
aquifer system. In low lying areas, it is unconfined aquifer
consisting of sandy loam (upto 15 m) over unfractured hard rock. In
plateau areas, it is confined aquifer - laterite, clay and fractured
hard rock.
[E] MY QUERIES:
1. Many of the input data files for FEFLOW (initial distribution of
hydraulic head and mass concentration, river water levels, well
pumping rates, transmissivity, conductivity, aquifer top and bottom
elevation etc.) are required to be in the trp (ASCII) format. How
these input files are to be created? Whether FEFLOW itself allows
creation of such files or some outside method is needed and how to do
that?
2. There are large number of dugwells in the study area (reported
density = 18 wells/km2, draft rate = 155 to 259 m3/day). However,
locations of these wells (on map) and their actual drafts are not
available. In such case, how well drafts can be incorporated in the
simulations?
3. How to proceed with FEFLOW setup if we intend simulation only in
part of the study area, say upto around 2 to 3 km within the coast
(15 km long), which is more vulnerable to seawater intrusion.
4. How to define boundary condition in the landward side - how far
and what?
5. Any other useful tips for carrying out the above study.
I shall be grateful for any suggestions from the learned members in
this group.
Thanks & Regards
Kumar
================================================
C. P. KUMAR
Scientist 'E1'
National Institute of Hydrology
Jal Vigyan Bhawan
Roorkee - 247667 (Uttaranchal)
INDIA
Web Page : http://www.angelfire.com/nh/cpkumar/ <http://www.angelfire
com/nh/cpkumar/>
================================================
Unfold the Goddess Within:
http://groups.yahoo.com/group/Shambhavi/ <http://groups.yahoo
com/group/Shambhavi/>
================================================
for your query on dug wells, if you attribute those wells to your first top
layer you can you use in flow material menu the "In/out flow on the top" button.
You have to do the balance between the pumping rate due to those dugwells with
infiltration rate (rain) and infiltration rate due to irrigation(or other
sources).
best regards
Thierry BONTEMPS
Project Manager - Civil & Environmental Technologies Dpt
TRACTEBEL DEVELOPMENT ENGINEERING S.A.
---------------------------------------------------
Avenue Jean Monnet 1 - B 1348 Louvain-la-Neuve - BELGIUM
tel. + 32 10 477 830 - fax + 32 10 477 819
mailto:thierry.bontemps@... <mailto:thierry.bontemps@...>
www.tde.tractebel.com <http://www.tde.tractebel.com/>
________________________________
From: feflow@... [mailto:feflow@...] On Behalf Of C.
P. Kumar
Sent: lundi 11 décembre 2006 05:50
To: feflow@...
Subject: [feflow] Model Setup for FEFLOW
Dear Group Members,
Using FEFLOW (for the first time), I am in the process of model setup
for simulation of seawater intrusion in Goa coast (India). The
relevant details are briefly presented below.
[A] Background for taking-up the Study:
Coastal tracts of Goa (India) are rapidly being transformed into
settlement areas. The poor water supply facilities has encouraged
people to have their own source of water by digging wells. During the
last decade, there have been large-scale withdrawals of groundwater
by builders, hotels and other tourist establishments. Though the
seawater intrusion has not yet assumed serious magnitude, but in the
coming years it may turn to be a major problem if corrective measures
are not initiated at this stage.
[B] Objectives of the Study:
Simulation of seawater intrusion in a region along Goa coast (Bardez
taluk of North Goa); evaluation of the impact on seawater intrusion
due to various groundwater pumping scenarios; sensitivity analysis;
and suggestions for remedial measures.
[C] Laboratory and Field Investigations carried out:
* Identification of 20 observation wells; measurement of monthly
groundwater level data in observation wells (September 2004 to August
2005); collection of bi-monthly groundwater samples during September
2004 to May 2005.
* Based upon the bi-monthly measurements of salinity in laboratory,
groundwater quality in all the observation wells was found to be
reasonably fresh, both in pre- and post-monsoon periods. It can be
attributed to the fact that the transition zone of fresh water-saline
water lies below the shallow open wells (in shallow unconfined
aquifer to a depth of about 10 - 12 m below ground), as evidenced by
vertical electrical soundings.
* Resistivity profiling: Apparent electrical resistivity measured
along four profiles (at 10 m depth plane) from sea coast to 525
meters inland. The seawater mixed zone was witnessed along two
sections in the low lying sandy alluvial areas.
* Vertical electrical sounding: Carried out at 7 monitoring well
locations upto a depth of 20 metres. Only three wells in the study
area show low values of resistivity below 12 metres depth, indicating
the presence of seawater or mixed zone below this depth.
[D] Model Setup:
The study area map (boundary - dxf, rivers - dxf, location of
observation wells - pnt) has been digitized and an initial finite
element mesh has been created for the entire area. Design of slices
and layers (3D model) and flow and transport data (initials,
boundaries, materials) are still to be done. There is mostly single
aquifer system. In low lying areas, it is unconfined aquifer
consisting of sandy loam (upto 15 m) over unfractured hard rock. In
plateau areas, it is confined aquifer - laterite, clay and fractured
hard rock.
[E] MY QUERIES:
1. Many of the input data files for FEFLOW (initial distribution of
hydraulic head and mass concentration, river water levels, well
pumping rates, transmissivity, conductivity, aquifer top and bottom
elevation etc.) are required to be in the trp (ASCII) format. How
these input files are to be created? Whether FEFLOW itself allows
creation of such files or some outside method is needed and how to do
that?
2. There are large number of dugwells in the study area (reported
density = 18 wells/km2, draft rate = 155 to 259 m3/day). However,
locations of these wells (on map) and their actual drafts are not
available. In such case, how well drafts can be incorporated in the
simulations?
3. How to proceed with FEFLOW setup if we intend simulation only in
part of the study area, say upto around 2 to 3 km within the coast
(15 km long), which is more vulnerable to seawater intrusion.
4. How to define boundary condition in the landward side - how far
and what?
5. Any other useful tips for carrying out the above study.
I shall be grateful for any suggestions from the learned members in
this group.
Thanks & Regards
Kumar
================================================
C. P. KUMAR
Scientist 'E1'
National Institute of Hydrology
Jal Vigyan Bhawan
Roorkee - 247667 (Uttaranchal)
INDIA
Web Page : http://www.angelfire.com/nh/cpkumar/
<http://www.angelfire.com/nh/cpkumar/>
================================================
Unfold the Goddess Within:
http://groups.yahoo.com/group/Shambhavi/
<http://groups.yahoo.com/group/Shambhavi/>
================================================
Hi Kumar,
-yes you can make trp file outside feflow. Just look
at the file format for trp file.
-if you have density of well for an area with average
pumping then you can 'simulate' them as well by
putting them as well boundaries. Of course having fix
coordinates is better
-you have to have a boundary taken from bigger
model(or assumption) for smaller part(nested model)
-be creative to define the boundary, it can be
topographic divide, groundwater divide, river
location, fixed head location or the worst but could
be better, assumption by considering good hydrogeologi
knowledge
-wait to hear from you
bye
LW
--- "C. P. Kumar" <cpkumar@...> wrote:
> Dear Group Members,
>
> Using FEFLOW (for the first time), I am in the
> process of model setup
> for simulation of seawater intrusion in Goa coast
> (India). The
> relevant details are briefly presented below.
>
> [A] Background for taking-up the Study:
>
> Coastal tracts of Goa (India) are rapidly being
> transformed into
> settlement areas. The poor water supply facilities
> has encouraged
> people to have their own source of water by digging
> wells. During the
> last decade, there have been large-scale withdrawals
> of groundwater
> by builders, hotels and other tourist
> establishments. Though the
> seawater intrusion has not yet assumed serious
> magnitude, but in the
> coming years it may turn to be a major problem if
> corrective measures
> are not initiated at this stage.
>
> [B] Objectives of the Study:
>
> Simulation of seawater intrusion in a region along
> Goa coast (Bardez
> taluk of North Goa); evaluation of the impact on
> seawater intrusion
> due to various groundwater pumping scenarios;
> sensitivity analysis;
> and suggestions for remedial measures.
>
> [C] Laboratory and Field Investigations carried out:
>
> * Identification of 20 observation wells;
> measurement of monthly
> groundwater level data in observation wells
> (September 2004 to August
> 2005); collection of bi-monthly groundwater samples
> during September
> 2004 to May 2005.
>
> * Based upon the bi-monthly measurements of salinity
> in laboratory,
> groundwater quality in all the observation wells was
> found to be
> reasonably fresh, both in pre- and post-monsoon
> periods. It can be
> attributed to the fact that the transition zone of
> fresh water-saline
> water lies below the shallow open wells (in shallow
> unconfined
> aquifer to a depth of about 10 - 12 m below ground),
> as evidenced by
> vertical electrical soundings.
>
> * Resistivity profiling: Apparent electrical
> resistivity measured
> along four profiles (at 10 m depth plane) from sea
> coast to 525
> meters inland. The seawater mixed zone was witnessed
> along two
> sections in the low lying sandy alluvial areas.
>
> * Vertical electrical sounding: Carried out at 7
> monitoring well
> locations upto a depth of 20 metres. Only three
> wells in the study
> area show low values of resistivity below 12 metres
> depth, indicating
> the presence of seawater or mixed zone below this
> depth.
>
> [D] Model Setup:
>
> The study area map (boundary - dxf, rivers - dxf,
> location of
> observation wells - pnt) has been digitized and an
> initial finite
> element mesh has been created for the entire area.
> Design of slices
> and layers (3D model) and flow and transport data
> (initials,
> boundaries, materials) are still to be done. There
> is mostly single
> aquifer system. In low lying areas, it is unconfined
> aquifer
> consisting of sandy loam (upto 15 m) over
> unfractured hard rock. In
> plateau areas, it is confined aquifer - laterite,
> clay and fractured
> hard rock.
>
> [E] MY QUERIES:
>
> 1. Many of the input data files for FEFLOW (initial
> distribution of
> hydraulic head and mass concentration, river water
> levels, well
> pumping rates, transmissivity, conductivity, aquifer
> top and bottom
> elevation etc.) are required to be in the trp
> (ASCII) format. How
> these input files are to be created? Whether FEFLOW
> itself allows
> creation of such files or some outside method is
> needed and how to do
> that?
>
> 2. There are large number of dugwells in the study
> area (reported
> density = 18 wells/km2, draft rate = 155 to 259
> m3/day). However,
> locations of these wells (on map) and their actual
> drafts are not
> available. In such case, how well drafts can be
> incorporated in the
> simulations?
>
> 3. How to proceed with FEFLOW setup if we intend
> simulation only in
> part of the study area, say upto around 2 to 3 km
> within the coast
> (15 km long), which is more vulnerable to seawater
> intrusion.
>
> 4. How to define boundary condition in the landward
> side - how far
> and what?
>
> 5. Any other useful tips for carrying out the above
> study.
>
> I shall be grateful for any suggestions from the
> learned members in
> this group.
>
> Thanks & Regards
> Kumar
>
> ================================================
> C. P. KUMAR
> Scientist 'E1'
> National Institute of Hydrology
> Jal Vigyan Bhawan
> Roorkee - 247667 (Uttaranchal)
> INDIA
>
> Web Page : http://www.angelfire.com/nh/cpkumar/
> ================================================
> Unfold the Goddess Within:
> http://groups.yahoo.com/group/Shambhavi/
> ================================================
Dear Group Members,
Using FEFLOW (for the first time), I am in the process of model setup
for simulation of seawater intrusion in Goa coast (India). The
relevant details are briefly presented below.
[A] Background for taking-up the Study:
Coastal tracts of Goa (India) are rapidly being transformed into
settlement areas. The poor water supply facilities has encouraged
people to have their own source of water by digging wells. During the
last decade, there have been large-scale withdrawals of groundwater
by builders, hotels and other tourist establishments. Though the
seawater intrusion has not yet assumed serious magnitude, but in the
coming years it may turn to be a major problem if corrective measures
are not initiated at this stage.
[B] Objectives of the Study:
Simulation of seawater intrusion in a region along Goa coast (Bardez
taluk of North Goa); evaluation of the impact on seawater intrusion
due to various groundwater pumping scenarios; sensitivity analysis;
and suggestions for remedial measures.
[C] Laboratory and Field Investigations carried out:
* Identification of 20 observation wells; measurement of monthly
groundwater level data in observation wells (September 2004 to August
2005); collection of bi-monthly groundwater samples during September
2004 to May 2005.
* Based upon the bi-monthly measurements of salinity in laboratory,
groundwater quality in all the observation wells was found to be
reasonably fresh, both in pre- and post-monsoon periods. It can be
attributed to the fact that the transition zone of fresh water-saline
water lies below the shallow open wells (in shallow unconfined
aquifer to a depth of about 10 - 12 m below ground), as evidenced by
vertical electrical soundings.
* Resistivity profiling: Apparent electrical resistivity measured
along four profiles (at 10 m depth plane) from sea coast to 525
meters inland. The seawater mixed zone was witnessed along two
sections in the low lying sandy alluvial areas.
* Vertical electrical sounding: Carried out at 7 monitoring well
locations upto a depth of 20 metres. Only three wells in the study
area show low values of resistivity below 12 metres depth, indicating
the presence of seawater or mixed zone below this depth.
[D] Model Setup:
The study area map (boundary - dxf, rivers - dxf, location of
observation wells - pnt) has been digitized and an initial finite
element mesh has been created for the entire area. Design of slices
and layers (3D model) and flow and transport data (initials,
boundaries, materials) are still to be done. There is mostly single
aquifer system. In low lying areas, it is unconfined aquifer
consisting of sandy loam (upto 15 m) over unfractured hard rock. In
plateau areas, it is confined aquifer - laterite, clay and fractured
hard rock.
[E] MY QUERIES:
1. Many of the input data files for FEFLOW (initial distribution of
hydraulic head and mass concentration, river water levels, well
pumping rates, transmissivity, conductivity, aquifer top and bottom
elevation etc.) are required to be in the trp (ASCII) format. How
these input files are to be created? Whether FEFLOW itself allows
creation of such files or some outside method is needed and how to do
that?
2. There are large number of dugwells in the study area (reported
density = 18 wells/km2, draft rate = 155 to 259 m3/day). However,
locations of these wells (on map) and their actual drafts are not
available. In such case, how well drafts can be incorporated in the
simulations?
3. How to proceed with FEFLOW setup if we intend simulation only in
part of the study area, say upto around 2 to 3 km within the coast
(15 km long), which is more vulnerable to seawater intrusion.
4. How to define boundary condition in the landward side - how far
and what?
5. Any other useful tips for carrying out the above study.
I shall be grateful for any suggestions from the learned members in
this group.
Thanks & Regards
Kumar
================================================
C. P. KUMAR
Scientist 'E1'
National Institute of Hydrology
Jal Vigyan Bhawan
Roorkee - 247667 (Uttaranchal)
INDIA
Web Page : http://www.angelfire.com/nh/cpkumar/
================================================
Unfold the Goddess Within:
http://groups.yahoo.com/group/Shambhavi/
================================================
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