open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi all!

I'm starting to use telemac 2d to simulate estuarine salinity fields.

I'm having a problem to input fresh water small river discharges in my model as a source.

The problem is that I have to impose zero concentrations for tracer values and my salinity fields are very diluted near sources. This is a common problem for modellers because mixing processes are note computed.

A typical solution I found is to use a localized rainfall over a node or element instead of a source. By this way, it is possible to get more realistic mixing effects near small rivers mounts.

However, I didn't found an option for input spatially variable rainfall in telemac2d.

Does someone have any good idea to solve this question?

Thanks!

Hello,

There should be no differences between sources and rain and sources are better (rain is treated as a source anyway).

A source has a discharge and a concentration of salt, the quantity you get inside your domain is exactly discharge * concentration * time.

If you enter the fresh water at a liquid boundary, this is different and you may enter too much fresh water by prescribing that salinity = 0 at the entrance. The remedy to this problem is to use :

TREATMENT OF FLUXES AT THE BOUNDARIES : 2;2;2;2 (if 4 such boundaries, you can also target only one boundary : 1;2;1;1). 1 is priority to values, 2 is priority to fluxes. Default is 1.

With best regards,

Jean-Michel Hervouet

P.S. A rain variable in space can be set in subroutine prosou.f, where the constant value of steering file is put into an array for all points, here you may change.

Ok Jean-Michel!

I will try your sugestion.

Thank you for your attention.

Taoan