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Note that to activate the heat sub-model in EFDC, the temperature constituent must be activated (Active Modules | Sub-Model Computational Options | Details). The ASER.INP file must be used for all of the thermal sub-models to compute the surface and bottom heat exchange processes. Also, depending on whether the current model is EFDC_GVC or EFDC+, the EFDC_Explorer form will have different options shown in the Main Heat Exchange Options frame.
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Figure 1 Atmospheric Parameters Surface Heat Exchange Options.
The Full Heat Balance with Variable Extinction Coefficient option was added in EE8.2 and provides the user with the option of allowing light extinction to be dependent on the total suspended solids in the water column, thereby making light extinction temporally and spatially varying. The extinction factors are determined on a cell by cell basis for each time step based on TSS, and if the water quality model is active, based on POM, DOM and Chlorophyll-a as well.
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