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Users can open the SEDZLJ Sediment and Bed Properties setting window by RMC on the Sediment sub-tab under Modules tab and select Setting. In Major Settings (Figure 3), users may specify the number of sediment bed layers and the number of sediment classes. However, the users should practice a caution when changing the numbers in Major Settings because it may cause loss of existing initial conditions and boundary conditions.
Figure 3 SEDZLJ Sediment Transport Module – Major Settings.
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Hard Bottom Option allows the user to specify in which cell erosion or deposition processes are activated or not. For example, no interaction between sediment bed and water column can occur at deactivated cells where zero value is assigned (bedmap.inp), so suspended sediment load is advected during the simulation but the particles in suspension are not allowed to settle down on riverbed in such deactivated areas. On the other hand, erosion or deposition processes are fully simulated at activated cells where a value of one is assigned (bedmap.inp).
Figure 4 SEDZLJ Sediment Transport Module – General Tab.
Sediment Properties Tab
In this tab, Sediment Class Properties for Sediment Distributionframe (Figure 5) allows the users to set the representative particle size, critical shear stresses for erosion and suspension, and settling velocity for each sediment class. These transport parameters are used to simulate the behaviors of the sediments in active movements (sediment materials in water column layers and active sediment bed layer). As SEDFlume test data are generally reported in CGS units, EFDC_Explorer also employs the unit of dynes/cm2 for critical shear stresses to be consistent with the reported data.
In Sediment Information frame, there is Sediment Info button reports the critical shear stresses and settling velocities computed based on the particle sizes entered in the Sediment Class Properties for the Sediment Distribution table table. The critical shear stresses and settling velocities are calculated using Van Rijn’s equations (Van Rijn, et al 1984), and the resulting values are provided in the pop-up window. However, those values are calculated only to provide users a guideline for those transport parameters, and EFDC_explorer would not use the values in the pop-up window when generating the SEDZLJ model input file (bed.sdf).
If users click the Initialize Defaults button, the critical shear stresses and the settling velocities in the Sediment Class Properties for Sediment Distribution table table will be filled automatically with the values calculated using Van Rijn’s equations. Then, those imported values will be written in the model input file and used for the model simulation. The users may enter those values manually using the associated measurement data they have, or they can also adjust them for model calibration.
Figure 5 SEDZLJ Sediment Transport Module – Sediment Properties Tab.
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In Sediment Bed tab (Figure 6), users can specify the sediment properties for active & deposition bed layers Active & Deposition Sediment Bed Layers including Active Layer Thickness Multiplier, Number of Deposited Sediment ClassesSize Categories, Number of Shear Stress Categories to Calculation Erosion of Newly Deposited SedimentsCalculate Erosion Rates (only for Erosion Rates Option 1), and Bedload Options.
At Sediment Erosion Characteristics table, the users can specify the lookup table to determine critical shear stress for active and deposited layers as a function of their D50 size.
Bedload Options allow the users to activate bedload computation for coarser classes and set the cutoff grainsize for the bedload computation.
Figure 6 SEDZLJ Sediment Transport Module – Sediment Bed Tab.
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The users can set the Number of SEDFlume Cores and thenassign the key measurements for erosion rate properties associated with each core. For example, if the Number of SEDFlume Cores is set to three, the drop-down will be populated with three cores in the Sediment Erosion Bed Characteristics frame where the name of each core can also be modified by users.
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The matrix for SEDFlume Measured Erosion Rates can have different formats depending on the Erosion Rates Options selected in General tab, and detail descriptions for each option are described in sections: Erosion Rates Option 1, Erosion Rates Option 2, and Erosion Rates Option 3.
Figure 7 SEDZLJ Sediment Transport Module – Core Definitions Tab.
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Through this process, EFDC_Explorer will generate the associated input file (core_field.sdf) following either DSI Standard format (I, J, and Core Number) or Sandia Lab Standard format.
Figure 8 SEDZLJ Sediment Transport Module – Core Assignment Tab.
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If the standard SEDZLJ wind wave option is selected, then the EE wind wave option is not used. In this case the user must ensure they have all the correct files such as FETCH.INP. Refer to the SEDZLJ user guide for details on this format. Conversely, if the STWAVE option is selected then correctly formatted STWAVE files are required.
Figure 9 SEDZLJ Sediment Transport Module – Wave Options Tab.
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Under Class Maximum Grain Size frame, users can set the maximum grain size for each sediment class that are used in the model. However, the user-defined maximum grain sizes are used only for computing median grain size, D50 (the SEDZLJ model simulation computes the sediment transport process using the representative particle size of each class).
Figure 10 SEDZLJ Sediment Transport Module – Miscellaneous Tab.
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