zheng

Thanks a lot, Peter.

Two more questions:

1. If the hydrostratigraphic units in the 3D model include unconfined aquifer, confining layer, and confined aquifer, I would also have to choose "unconfined" and then make the corresponding settings for each of the slices, right?

2. If the hydrostratigraphic units in the 3D model include confining layer, confined aquifer, confining layer, and another confined aquifer, and I want to include the first confining layer in the 3D model, do I have to choose "unconfined" or "confined"?

I appreciate your help.

Hi All,

I have a 3D model, including unconfined aquifer, confining layer, and unconfined aquifer. In the FEFLOW problem classifier, should I choose confined or unconfined?

Any help will be definitely appreciated!

Hi, I set a "fresh water" conditions along the whole outer border of the modeling area. But, when I checked the total mass balance, I found that the mass flux in and mass flux out became larger comparing with the model without the "fresh water" conditions. It makes no sense for me. Why is that?

I appreciate any relpy.

Zheng   

When I change the storativity of a 3D phreatic surface flow-only model, the calculated hydraulic heads at the observation points do not have any change at all. What is the STORATIVITY for?

Thanks,

Zheng 

I cliked the VIEW button, a new window popped up. But on the left bottom of the plan view, there is no cross section appearing. But I think the cross section should appear there. Am I right?

I appreciate your help.

Zheng

Hi Alex,

Thanks a lot for your reply.

I did run it as a steady state flow-only model first, and everything looks fine. My work flow is:

1. Build this 3D steady state flow-transient transport model;

2. Reduce this model to a steady-state flow-only model, and run it. The results look fine.

3. Run the original steady state flow-transient transport model. And check the results.

And the results I mentioned in my first post happened. I do not want to incorporate mass-density relationships in my model. I do not know how to incorporate this relationship. I think my model does not incorporate mass-density relationships.

I appreciate your help in this regard.

Zheng   

Hi,

If you specified an aquifer as confined aquifer, and in the process of pumping, parts of it becomes unconfined (i.e., there exists free surface in some parts of the domain). Is there a mechanism in FEFLOW to deal with this? The computation will change automatically from confined equation to unconfined equation? I appreciate your response.

Zheng

Hi,

If the hydraulic conductivity (K) of the river bed is known, how to determine the thickness of the colmation layer in oder to calculate the the transfer rate? Your response is appreciated.

Thanks,

Zheng 

Hi,

I run a 3D steady state flow-transient transport model, and used the Budget Analyzer to calculate the flux through a 3rd BC, and obtained a value of -1646 m3/d. I then reduced the model to a flow only model (still steady state), and run the model again. I then calculated the flux through the same 3rd BC, and obtained a value of -4 m3/d. Any one had the same problem as I did? I think the flux should be the same, but FEFLOW gave a really different value. I appreciate your help.

Zheng

Hi all,

I set up a 3D steady flow-transient transport model. I put a flow sink on the top  layer, and the results showed that contaminant accumulated along the sink, and had a very high concentration (5 times higher than the contaminant sources) along the sink. What is the reason for this problem? When you put a sink there, is the contaminant also removed from the model domain? Or you have to put a contaminant sink there simutaneously? Any help  would be appreciated.

Zheng