The General tab in the Temperature Parameters form allows the user to configure the Ice Computation Options, Bed Heat Exchange Coefficient, and Evaporation Options as shown in 244023409 Figure 1. These options are each described in detail below. Note that by default the Display Options in EE are the water depth and water surface elevation include the ice thickness. This can be manually changed by the user in this option.
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Figure 1. Temperature Parameters: General.
Ice Computation Options
A robust ice sub-model is available in EEMS. Older versions of EFDC had relatively limited ice modeling ability. Ice formation and melt is currently simulated by EFDC using a coupled heat model and fully handled by EFDC_Explorer.
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Ice options are now available under the Ice Computational Options frame shown in Figure 2. For all these options, ice is only enabled if the user is simulating temperature.
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Figure 2. Temperature Parameters: Ice Computation Options.
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Figure 9. Ice Sub model: 2DV View Properties.
Evaporation Options
The Evaporation Options (Water Balance Only) frame is only displayed if the appropriate surface heat exchange sub-model has been shown in the Surface Heat Exchange tab. Evaporation Options will only appear for the following surface heat exchange options:
- Full Heal Balance (Legacy)
- Full Heat Balance with Variable Extinction Coefficient
- Equilibrium Temp (CE-QUAL-W2 Method)
The heading states the evaporation options are for water balance only because for the water balance evaporation is optional. If activated, there are a number of ways to define or compute evaporation. Since EFDC+ is a coupled model, any changes to the water balance is automatically accounted for in all other modules, including the eutrophication module. Note that evaporation is always included in the surface heat exchange processes.