MIKE SHE/MIKE 11 error

I set up a coupled MIKE SHE/MIKE 11 model for simulating saturated zone heads and runoff for a small agriculture watershed. I have UZ, SZ, overland flow and irrigation components included in the model. While running the simulation i get an  error message like this:

check_time_out_sequencial: new output time incorrect, storing time step changed?
Specified time : 2664.00
Expected time : 2656.00
Error writing datatype, subtype, time: 17,1,2664.00000000

The simulation stops with this error message.  If i run the simulation again, sometimes i don't get any error and simulation succeeds. This error is causing a good number of failed simulation runs while running the Autocal tool. Can someone please help me in understanding what might have been causing this error?

Thanks,

Hi,
This is a problem that we have seen a few times, in models where the UZ time step gets very small.  The error is caused by a tolerance on the time step numbers (floating numbers), which causes a difference between the storing and actual time step, and this is noticed by the model in the error message, and the model stops.  We are aware of the problem but there is no solution available at the moment. If you are able to reproduce the problem in a very simple model, then feel free to send the model to mikebydhi@dhigroup.com and we will be happy to take a look at it.

If you have a model that is forced into these very small time steps it might be that some of the parameter sets used in the AutoCal are not valid, and it might help if you try to restrict the boundaries for your parameters.  The models that are crashing in your optimisation might not be useful in the evaluation as the parameters or the conceptualisation causes the model to run with these very small time steps.
Please feel free to contact DHI (mikebydhi@dhigroup.com) if you have more information or if you have a simple setup that are able to reproduce the problem.

Best regards
Oluf (DHI)