The most state-of the-art sediment transport sub-model for EFDC is the SEDZLJ module that uses Sedflume data to determine erosion rates has been developed by Sandia National Laboratories. A detailed description of the SEDZLJ implementation in EFDC code is available in Sandia National Laboratories Environmental Fluid Dynamics Code: Sediment Transport User Manual (Thanh et al. 2008). The SNL approach, shown in Figure 1, accounts for multiple sediment size classes, has a unified treatment of suspended load and bedload, and appropriately replicates bed armoring. The resulting flow, transport, and sediment dynamics in the model is an improvement to previous models because this model directly incorporates site-specific erosion rate and shear stress data, while maintaining a physically consistent, unified treatment of bedload and suspended load.
Figure 1 Structure of the SEDZLJ sediment transport model.
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1.1 General Settings Tab
The General tab (Figure 3) is used for primary computational options for the SEDZLJ sub-model. In this tab, the user can turn on or off the simulation of SEDZLJ with the Simulate Sediment Transport Using the SEDZLJ Sub-Model check box. Other options Options include allowing bed morphology changes with hydrodynamic feedback, computing bedload for coarser classes, and accounting for bed slope change.
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The Erosion Rates tab provides the user with the Active and Deposited Sediments Erosion matrix as shown in Figure 56. Highlighted cells provide a warning to the user that the erosion rate is not increasing with the increasing shear category, or that erosion rates are not decreasing with the increasing grain size. This is simply a QC check for the user and EFDC+ will still run despite the inconsistent values that have been input.
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