Thierry

hi

it means only that you have no flow through the boundary. the in the model you flow is parallel to the boudary (included vertical flow). 

For the rest of your question, I don't know, it's necessary to visualize something, but may be it's a question of representation of the vectors. The vector seems to cross the boundary, but in reality it's not the case.


hope this would help you
best regards

dear group members

We are currently discussing (at the office) the possibility to upgrade our GIS software or to acquire a new one!

in the discusion, we want to know the difference between MAPINFO and ARCINFO using FEFLOW.

is there a difference for FEFLOW, one is the best, or the easiest any ...experience is welcome.

Thanks for any answer

Good afternoon !

I hope this is not a too late answer

in Hydrogeology an groundwater Modelling by Neven Kresic second edition 2006 page 485 (CRC Press), you could read :
"As defined in the USEPA directive, on applying monitored natural attenuation (MNA) at contaminated sites (...),natural attenuation processes in general include a variety of physical, chemical, or biological processes that, under favorable conditions, act without human intervention to reduce the mass, toxicity, mobility, volume, or concentration of contaminants in soil or groundwater.  These [i]in-situ [/i] processes include biodegradation; dispersion; dilution;sorption;volatization; radioactive decay; and chemical or biological stabilization , transformation, or destruction of contaminants."

by the way in the same "good" book page 476 "(...) Because of sorption, the contaminant movement in groundwater is slowed down relative to the average groundwater velocity. This effect is callaed retardation (...)

For Modelling natural attenuation of chlorinated solvent you can use your  search Engine on BIOCHLOR

My colleague Daniel find this two interresting links

[color=blue]doctorflood.rice.edu/envi518/Handouts/Lisbon/06_Biochlor.ppt
www.afcee.brooks.af.mil/products/techtrans/download/biochlor_database.pdf[/color]

we hope this answer could help you

Some ideas to help you :

Is the oscillating head close to the interface between two layers?
May be you could change the hydraulic conductivity (increase hydraulic conductivity in the 3rd layer) to test if you have always that problem

How many days are you using for one run of your model? maybe it's not enough

Have you checked your free surface definition in the Problem definition menu, what is the "free surface definition" for the 3rd layer, where you put Q=340

Best regards

How do you have imposed your boundary conditions?