Transient Modflow model - Stress Periods

[m GMS User 0]

Hello everyone,

I am building a transient MODFLOW model with GMS 7.0 using the conceptual model approach.

There is a huge problem with the number of stress periods I want to run :

- Until I've less than 1001 stress periods, MODFLOW runs, everything is ok

- If I have more than 1000 stress periods, MODFLOW aborts immediatly (I mean it is not a problem of convergence)

Hereunder the error message :

"Excutable started

.....

This file is not a GMS MF2K superfile. Assuming NAM file

......

ALLOCATION OF ARRAYS X, Z, IX AND XHS FAILED

RETURNED ERROR MESSAGE NUMBER : 41

MODFLOW 2000 finished"

I have made many many tests with my files and I have also tested it with entering the data manually directly in the Stress Priod box in Global Options.

Moreover, I don't understand because the option of output control "Enable saving of computed flows for all source sink object" is already unchecked...

Thanks in advance for any help !

[Alan Lemon 3]

By default the maximum number of stress periods in MODFLOW is 1000. The version of MODFLOW distributed with GMS has this same limitation.

[m GMS User 0]

Ok thanks Alan,

I seen you posted a version of modflow with the max number of SP=10 000 but now the link is not available.

How can I get this ? because I Need use more than 1000 SP ...

Thanks in advance !

[Alan Lemon 3]

Sorry for the slow response. Here is a version that is compiled for 10000 stress periods.

ftp://pubftp.aquaveo.com/download/temp/mf2k_h5.zip

[IKA 0]

Hi

I also have this problem as I wish to run with 3652 stress period. How can I get hold of this addition of GMS, the link does not seem to work.

Thank

Ida

[Alan Lemon 3]

Have you tried the version of MODFLOW that is distributed with GMS 8.1? I think I changed the one that we distribute so that it will handle 10000 stress periods.

[Groundwater Modeler 0]

Hello all,

I realize it is been a number of years since this thread was last active, but I am running into a similar issue in SEAWAT V4. I need ~35,000 stress periods and it appears the max number of stress periods in SEAWAT is 10,000. I'm receiving the error below. Does anyone know where I can increase the number of allowable stress periods in the SEAWAT source code so that it can be recompiled to accept a larger number of stress periods? I'm modeling tides, so many stress periods are needed to resolve the tidal signal over a year.

 **** STRESS PERIOD(S) IN SIMULATION
 THE MAXIMUM NUMBER OF STRESS PERIODS IS:10000

Thank you.

[Michal 0]

Hello,

There is a parameter in the swt_v4.f on line 200 called MXPER. It should be just a matter of changing its value to lets say 100 000 and compiling.

 

[Groundwater Modeler 0]

Thanks very much, Michal!

Edited September 23, 2020 by Groundwater Modeler