General Purpose
Masks are thin dams that may be configured on a cell face in order to fully or partially block the flow between cells in the model domain. This feature is accessed from the 2DH View, where a Grid Mask layer appears in the Layer Control frame by default.
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Anchor Elevation: if set to zero the object on the water will be considered as floating (e.g ships), otherwise it is a fixed object (e.g bridges, docks).
Draft: the thickness of the floating or fixed object on the water.
Clearance: is the thickness of space between the Draft and Bottom Sill when it is equal to 0, the object plays the role of a fully blocking mask, otherwise it is a partial blocking mask.
Bottom Sill: the thickness of a solid structure on the surface of the riverbed.
Bottom: means the riverbed.
2DH View
Adding New Masks to Grid Cells
Masks can be added from the 2DH View, where the Masks layer is displayed on the Layer Control as default. To add the masks, select the Masks layer then turn on the light bulb, pointer, and pen icons as shown in Figure 2. Masks can be assigned to a single grid cell or multiple cells.
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Add masks to multiple cells: To add masks to multiple grid cells at the same time multiple cells must be selected first. This is done by holding the Ctrl key and LMC to select various single cells, or by holding the Shift key and LMC to select a range of adjacent cells. Other ways to select grid cells are described in Grid Cell Selection. The next steps for adding masks to these cells are similar to that for adding a mask to single cell as presented above.
GUI Editing
LMC on the Mask layer in the Layer Control to have some following options as shown in Figure 5.
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Figure 10. Remove grid masks.
EFDC+ Input File
The EFDC input file for masks is mask.inp, in the file will show the number of cells having masks with three columns including I, J and MTYPE columns. In which the MTYPE column is the type of mask configured to the grid cell. (see Figure 11)
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