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Setup of sediment water interaction

SM
Stefan Mirbach, modified 3 Years ago.

Setup of sediment water interaction

Youngling Posts: 13 Join Date: 1/3/12 Recent Posts
Hi everybody,

I'm trying to setup the sediment water exchange module on a 3d-zLayer-model of a lake and encountered some problems. Can anybody help me with the following two questions?

1. In the third group of the input-file (*.inp) I have to specify a sediment-grid by including a file with the appropriate numbering of the bottom segments. Since I am using z-layers the bottom cells are not simply the cells in the last layer, but depend on the water depths of the vertical column. Do I have to specify the exact bottom cell? How do you deal with cells outside of the lake? Does anybody have an example file?

2. I tried different configurations of the sediment-grid and didnt' t get any error messages related to the grid when running delwaq1. Nonetheless delwaq1 stops with an error saying ' ERROR. End card of block 5 not found'. It seems to look for open boundaries, although I didn't specify any. In the lst-file, I get negative numbers for the bottom exchange segments. According to the manual, negative numbers are reserved for open boundaries, so maybe that's the reason. Is this because of the wrong specification of the sediment-grid (question 1) or is there another reason?

Let me know if you need further informations.
Thanks!

Best regards
Stefan
SM
Stefan Mirbach, modified 3 Years ago.

RE: Setup of sediment water interaction

Youngling Posts: 13 Join Date: 1/3/12 Recent Posts
Ok, I forgot to specify the boundary conditions at the lower boundary of the sediment, obviously. Now it is running, but nothing happens. The concentrations in the sediment layers remain constant throughout the simulation and there's no exchange between water column and sediment. Maybe I forgot to activate the complete set of processes needed.

I have another, more general question: Is it possible to write output from the sediment layers into the map file, and if yes, how so?

Your help is greatly appreciated.

Stefan