Jiale Wang

Thanks for your reply, Jarrah and Blair!

By using "isochrone markers", I have gotten the groundwater residence time.

Thanks!

Thanks for your reply,  Jarrah!

By using backward pathline, I can detect where does the groundwater come from. But how could I identify the running time of groundwater from recharge area  moving to the discharge area?

Looking forward to your reply! Thanks!

Hi! I'm now using FEFLOW 5.3 to study karst water system.

In the research of modeling groundwater by FEFLOW, I met a problem that was how to calculate groundwater residence time in FEFLOW. In other words, how is the running time  of groundwater from recharge area to discharge area calculated in FEFLOW?

Looking forward to your reply! Thanks!

Hi! I'm now modeling solute transport in a Karst area. Chlorine was used as a tracer for its steady and unreactive property.

The source of Cl is mainly from rainfall leaching soil. So it is a planar input with the rainfall. But I'm very confused how to fulfill importing Chlorine into my model through rainfall. Is it in the "Mass transport boundaries" or "Mass transport materials"? Please tell me the specific steps.

Looking forward to your reply! Thanks!

Thanks for your reply, Blair!

Then I still have a question. That is for free and movable surface, how is parameter interpolation achieved during the simulation in elements where the water table cuts through slices of the initial stratigraphy? Or what law is this parameter interpolation based on?

Looking forward to your reply, thanks!

Thanks for your reply, Blair!

I have read the help file titled "Free Surface Definition". But I'm still confused. So could you tell me the advantages and disadvantages of using "Free & movable" or "Phreatic" for the first slice?

Thanks!

Hi! When defining the first slice, I'm very confused of when to use "Free & movable" and when to use "Phreatic". Could you tell me the difference between them and the rule of using them?

In my model, the first layer is an unconfined layer. The groundwater depth from ground surface is 2- 200 m because my model area includes plain and mountain. So in my model, which should I use to define the first slice, "Free & movable" or "Phreatic"?

Looking forward to your reply, thanks!

Hi! I'm wondering about how to calculate evaporation in FEFLOW.

In my model. the limit depth of phreatic evaporation is 1.5m, and the evaporation rate is 0.0008mm/d. Then I want to get the result of evaporation in my model area. It is an important item in water balance.

So can you tell me how to achieve it in FEFLOW and list the formula in detail which I think should be used in "In/out flow on top/bottom"?

Looking forward to your reply! Thanks!

Pete and Blair, thanks for your reply!

Yes! The change of groundwater level also depends on the location of model. The results in recharge area and discharge area are different.

Thanks! I have got it!

Hi! Now I'm modeling a steady model. But when I adjusted hydrogeological parameters according to observing groundwater level, I met a strange problem. That is, when I changed conductivities larger, the caculated water level in observing well became larger; when I changed conductivities smaller, the caculated water level in observing well became smaller.

This caculated result was illogical. I suppose the water level should be in negative correlation with conductivities. So I'm very confused about the caculated result above.

Please tell me what kind of error may lead to the wrong result I got above. Looking forward to your reply! Thanks!