There are several ways to build sediment beds in EFDC+ Explorer as shown in the Initialization of Sediment Beds form in 246350450 Figure 1. The simplest option is to create a uniform bed, other options include Use Polygon Digital Surface Model and Use a Sediment Cores with Grainsize, each of which is described below. For each of these options the Grid Cells Options frame allows the user to build sediment beds for the whole domain or just for cells inside user-selected polygons.
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To set up a simple horizontally uniform sediment bed for the model the user can use the with Inorganic Sediment Bed Constructor: Uniform Layers tool shown in 246350450 Figure 2. This tool is accessed from the Create Uniform Bed button in the Initialization of Sediment Beds. The Bed Constructor asks the user input the number of layers, the number and types of sediments, and allows the user to specify the sediment fractions, thickness, and bulk densities for each layer. The user must still set the cohesive and non-cohesive erosion, and deposition parameters, but once the user finishes this option, the sediment bed configuration is ready for EFDC.
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Another option provided in EE is the ability to build a sediment bed from sediment core data. Figure 3 shows an example of a digital sediment model derived from sediment cores. The data contained grain size distributions by depth interval. The black solid circle symbols show the locations of the cores. The plot shows the resulting depth-averaged d50 grainsize.
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