This tab contains the Ice Simulation Options frame, Initial Conditions Bed Temperature frame, and the Bed Heat Exchange Coefficients frame which are described in the following sections.
The EFDC_GVC model uses a thermal bed model to determine the bed/water column heat exchange (Tetra Tech, 2007c). A sediment thermal thickness is assigned for the entire model. This thickness is not related to either the sediment transport model's bed or the water quality sediment bed. This thermal layer is then divided into KBH layers (must be >2). A constant initial bed temperature can be used or alternatively the TEMPB.INP file can be used to assign a spatially variable initial temperature, by layer. Check the Use TEMPB.INP checkbox in the Bed Thermal Options frame for this option.
The EFDCPlus version of the model has two different approaches for the bed heat sub-models. If the standard EFDC full heat balance (ISTOPT(2)=1) sub-model is used, the water/sediment bed heat exchange model of the pre-GVC version is used. If the user has selected the equilibrium temperature sub-model (ISTOPT(2)=4) then the bottom heat exchange is computed using the heat exchange coefficient and the user can assign spatially varying sediment thicknesses and initial temperatures using the TEMB.INP file.
Various atmospheric parameters can be adjusted with the options changing slightly depending on which heat sub-model is being used.