MODFLOW forward vs. backward tracking in Modelmuse

[RM]

Hi All-

I was able to forward track particles in modelmuse. But I am struggling with backwards tracking for some reason.

Here are some basic info of the current model setup:

1. I have one steady state (0-1 sec) and one transient stress period (1 - 1576800000 sec) with a max time step of 315360000 sec (10 years) i.e. 5 time steps in transient

2. the output mode (MODFLOW packages and programs) is selected as "pathlines" for Modpath version 6.

3. the initial particle placement is at "top" with a "grid" choice

4. I release my particle at 1 sec (release tracking time) and it provides me 50 years of simulation result going forward

However, when i select backward tracking from "tracking direction", the model does not run for 50 years (1576800000 sec) backward in time; instead it runs for 1 sec only. Is only 1 time step allowed for backwards tracking? How could I track backwards for 50 years or more? am I missing something?? Please let me know if you need more information.

thanks in advance -RM

[Richard Winston]

Try changing the release time to the end of the simulation.

Sent from BlueMail

[RM]

Thanks for your suggestion. I did change the release time to the end of simulation but it did not work for some reason. It always stops after the first time step whether "steady" or "transient".

[Filippo Forlani]

Did you solve the problem? I have the same...

[ashutosh singh]

I also have the same problem.

I was trying to focus on some other issues in my python code and thats the reason I dint ask it yet.

Hpc

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[Filippo Forlani]

[Solved] I solved it: Reference time in ModPath is the starting of the simulation. In backward simulation delta time is negative, so 'reference time' is at the end.

I used modelmuse, so for the object put the 'real' time, in defining postprocessor->modpath "reference time" should be set to the final time (for example in my problem was at the end of simulation, 360days).