How to calculate groundwater residence time in FEFLOW

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!

Try using pathlines
[url=http://www.feflow.info/html/help/default.htm?turl=HTMLDocuments%2Fworkflows%2Fvisualization%2Fpathlines.htm]http://www.feflow.info/html/help/default.htm?turl=HTMLDocuments%2Fworkflows%2Fvisualization%2Fpathlines.htm[/url]

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!

Look in the help file I linked for descriptions relating to "isochrone markers". These marks are measures of residence time along the pathline.

You might also want to create a population of seed points around your target, including at different depths.  This will provide a range of travel times and origins.  You may notice this varies quite a bit depending on where you place your seed points so it is important to capture this variation.

Lilke your picture by the way Jarrah.. the likeness is uncanny.

Thanks for your reply, Jarrah and Blair!

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

Thanks!

Alternatively, you might want to check out chapter 8 in the FEFLOW White Papers, Volume I.