The sediment transport parameters and options are set using the Modify button, which forms shown in Sediment Transport Options to Sediment Transport Options.
The user also has further option for setting the sediment bed with EE's Sediment Bed Initialization Tools. These are described in detail in the ViewPlan discussion.
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Figure 1 Sediment Transport – General.
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For many of the fields in the Erosion & Deposition Parameters grid, clicking on a cell and pressing F2 pops up helpful information for that field.
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Figure 2 Sediment Transport – Cohesives.
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The Sediment Info button provides a sediment properties calculator which uses the Van Rijn equations to compute the critical stress and setting parameters. Pressing the Set Parameters button will initialize the sediment properties using the Van Rijn equations if the sediment diameter is specified prior to pressing the button.
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Figure 3 Sediment Transport – Non-Cohesives Suspended.
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The Bedload Phi Options frame allows the user to choose from the following options Constant/Manual, Van Rijn, Engelund-Hansen, and Wu, Wang &Jia.
The Cell Face Transport Rate Option allows calculation based on the following options: Downwind Projection; Downwind Projection with Corner Correction; and by Averaging Vector Components. The Maximum Allowable Adverse Slope for Bedload setting will prevent bedload movement if cell to cell slope is > BLBSNT when BLBSNT is > 0.
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Figure 4 Sediment Transport – Non-Cohesives Bedload.
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Sediment Transport Options shows shows the tab for the Morphology & Consolidation of the sediment properties option. In this tab the user may specify various bed consolidation and bed morphology settings.
The Bed Morphology Options form allows the user to choose between no bed changes (option 0) and allowing bed elevation changes (option 1). The Max. Water Depth is the maximum allowable depth to allow for the "lost" due to "NEG DEPTH" morphological change (EFDC_DSI version only).
Bed Consolidation & Mechanics Options frame provides input to the main sediment bed consolidation options. The Bed Mechanics option must be 0-None, 1-Simple, or 2-Finite Strain. Option 2 is very a specialized approach and requires a detailed understanding of the of the Finite Strain implementation in the FORTRAN code. The consolidation rate is in seconds, not 1/seconds as earlier versions of EFDC.INP reported. The rate will usually be >100,000 seconds. The impact of the rate of consolidation can easily be tested using EFDC_Explorer's Single Column Sediment Layers post-processing function (see Sediment Bed Process Tools).
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Figure 4 5 Sediment Transport – Morphology and Consolidation.
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The user options for the Bed processes tab are shown in Sediment Transport Options. EFDC_Explorer now employs bed armoring functionality, allowing the user the options of: No Armoring; Non-Cohesive Armoring for Garcia-Parker; and Armoring with Active Parent Layering. The layer options frame is displayed based on which armoring option is selected. For the case of armoring with Active-Parent layering, the user needs to specify an active layer thickness, usually <5 cm but based on the d50's, and whether the active layer is controlled by mass or thickness. EFDC can optionally initialize the active layer using the initial condition bed layering. This is a good approach for initial setup of a model when the bed configuration is not well defined.
The user may also specify the Non-Cohesive Resuspension Options, with a choice of modifications based on coefficients input by the user. This option modifies the critical shear stress for resuspension (i.e TAUR) based on the fraction of cohesives.
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Figure 5 6 Sediment Transport – Bed Processes.
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Sediment Transport Options shows the sediment parameters form with the Initial Conditions tab selected. On this form the user selects how they would like to initialize the bed sediments for the model. This is done by selecting the option from the Sediment Initial Conditions Options frame. These options include: Constant Water Column and Bed; Spatially Varying Water Column; Spatially Varying Bed Conditions; and Spatially Varying Bed and Water Column.
If the user elects to set the Bed Mass Specification Option to specify the mass fraction, then and the BEDLAY.INP will required as an additional IC file.
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Figure 6 7 Sediment Transport – Initial Conditions.
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