how to to model pollutant diffusion ?

[rcxy]

Hi,I want to do pollutant model to study the environmental capacity.
I want to model the COD, DO, Nutrient,Chla.
However, i don't know how to start?
I have read viewtopic.php?f=1&t=1679&hilit=POLLUTANT . I don't konw how to do ?
Please help me. Thanks!

[rcxy]

i know roms can add a passive tracer (such as COD ). However, i want to do a model 'couple' the COD wtih NPZD (or EcoSIM, NEMURO ) model. How to do ?
Thanks !

[kate]

Do you know what equations you want to be solving for COD? Look at the equations for say NEMURO and see how they are being solved in the ROMS code. The bio modelers I know best have to do many, many parameter studies, typically in a 1-D setting, when adding new components. They do not however read this forum.