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beckers.e
Junior Member

Belgium
3 Posts
Posted - 03/02/2010 :  15:19:44  Show Profile  Reply with Quote
Hello everybody,

I'm trying some options in Hydrus 1D and I don't understand very well some aspects. I tried three simulations :
1. In soil Hydraulic property model I choose van Genuchten function and in solute transport I choose dual porosity with MIM. So I fill in the immobile water content and the mass transfer coefficient only in the solute windows
2. In the second simulation I choose Dual porosity with MIM in soil hydraulic property and in the solute transport window. I fill in the parameters only in the soil hydraulic parameters window.
3. In this simulation I choose Dual porosity with MIM in soil hydraulic property and in the solute transport window. I put the parameters in the soil hydraulic parameters window and in the solute parameters windows.

The three simulations are giving me different results in solute concentration. I suppose that the difference between the first and second simulations are the consideration of transfer only for the solute or for the water flow too, is it true ? But for the second and the third I don't undersand what I'm simulating. What are the differences between these options ?

Thank you for your answers

Eléonore

Jirka
Moderator

USA
1788 Posts
Posted - 03/02/2010 :  15:35:26  Show Profile  Visit Jirka's Homepage  Reply with Quote
Eléonore,

I believe that this is all describe in detail in the two papers given below.

Just briefly here:
1. Here you solve uniform water flow and then subdivide water content into two domains. What is the immobile water content and mass transfer is specified in the solute transport part.
2. Here you solve nonuniform water flow (dual-porosity), you need to specify mass trasnfer for water in the water flow part. In the solute transport part, you should specify (from parameters related to nonequilibrium) Frac (fracture of sites in mobile and immobile zones) and Alpha (mass transfer for solute). ThetaIm in the solute transport part should be zero (as indicated) since thetaIm is provided from the water flow module.
3. This should be the same. It only seems that in (2) since you do not specify any parameters, you assume only convective solute transport between the two domain (solute flow with water). Alpha will add the diffusive transport between two domains.

Jirka

Šimůnek, J., N. J. Jarvis, M. Th. van Genuchten, and A. Gärdenäs, Review and comparison of models for describing non-equilibrium and preferential flow and transport in the vadose zone, Journal of Hydrology, 272, 14-35, 2003.

Šimůnek, J. and M. Th. van Genuchten, Modeling nonequilibrium flow and transport with HYDRUS, Vadose Zone Journal, doi:10.2136/VZJ2007.0074, Special Issue “Vadose Zone Modeling”, 7(2), 782-797, 2008.
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