Diffusion coefficient for Henry problem is actually the total dispersion
coefficient.  Henry assumed a constant dispersion coefficient (D) to obtain
his semi-analytical solution.  You will notice that the dispersivity values
are 0 for the Henry problem.

-Rohit


> --- In seawat@... <seawat%40yahoogroups.co.in>,
> "hydrogeomatt" <matt_d_webb@...> wrote:
> >
> > Hi,
> >
> > Does anyone know where I can find some literature values for the
> diffusion coefficient for saline water in an aquifer? I have searched and
> found very little, only conflicting information. The tutorial tells you to
> use 10^-10 m2/d, but the manual (older version) which discusses Henry's
> problem says that they used 1.62925 m2/d. They are obviously many orders of
> magnitude different, which is worrying!
> >
> > Also, is it possible to change the diffusion coefficient once you have
> set up a transport variant in SEAWAT? The option is there under the species
> parameters when you first apply the values, but if you return later the
> option is no longer on the list. Do I have to add a new species from scratch
> or is there a quick way?
> >
> > Thanks,
> >
> > Matt