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With the release of EEMS10.3, the number of biota groups has become unlimited. This means that when a model that was created in EEMS10.2 or earlier is opened in 10.3 or later, the way EEMS handles and displays the biota groups is different. When displayed initially, all biota groups will be shown as in Figure 2 below. The values of 0 and 1 indicate which parameters are inactivated or activated respectively. When the user saves the model, only the activated biota group will be saved and displayed in the EEMS10.3 model. |
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Figure 1. Water Quality Tab: Kinetics.
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Figure 3. Miscellaneous frame.
EFDC+ allows users to assign any of the water quality parameters for water column zones. Check the box Use Zones for Kinetics and then click on the Define Zones button brings up the Apply Cell Properties via Polygons form (see Apply Cell Properties via Polygons). The user must first enter the maximum number of desired zones in the Number of Kinetic Zones box. This number may be changed at any time during the model building process.
Figure 4. Define Zones.
Zones are assigned by the water column layer and cell, so it is possible for the same cell to have more than one zone assigned to it if KC>1. The parameters that vary by zone are shown in the Water Quality Kinetics frame. There are three groups of parameters that can be varied by zone: Kinetics, Settling, and Algal Dynamics. For each group, the use of zones or not is separately controlled using the checkboxes for that group. The specific parameters for the Current Zone for each group are modified by clicking on the Modify button. When the kinetic zones are enabled, these values are used in preference to the default values that will still be displayed under COD parameters under the Nutrients tab.
Figure 5. Water Quality Kinetics.
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