Benthic flux settings are made in the Sediment Fluxes tab is shown in Figure 1. The nutrient benthic flux computational options are set using the Modify Parameters button in the Benthic Flux frame.
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Clicking the button displays the form shown in Figure 2. The top frame, Benthic Nutrient Flux Method is the option that controls EFDC's benthic flux approach. If the nutrient mass fluxes are to be specified either as constants or variable in time and space, then the diagenesis tabs are not used and consequently disabled. If the Full Diagenesis Model (DiToro & Fitzpatrick, 1993) option is selected then the three diagenesis tabs are visible to allow the user to specify the diagenesis parameters.
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Figure 2. Sediment nutrient flux – Sediment Diagenesis Options and Parameters.
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In addition to the diagenesis kinetic parameters, the sediment bed diagenesis initial concentrations also need to be specified. This can be accomplished by applying measured data for each parameter using the Spatially Varying IC's button. When pressed, the form shown in Figure 4 is displayed. Each parameter reaction class, i.e. G1 (most reactive), G2, and G3 (least reactive or inert) can be separately specified or specified at once by selecting options in A Class Options frame. The Value to Set frame allows the user to select the assignment method by using a Constant value, interpolating From Scatter (XYZ) Data or From Profile Data. The data can be interpolated for the entire model in a single operation or using only selected cells by selecting in Grid Options frame.
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The diagenesis kinetic parameters can be divided into zones using the Diagenesis-Zones tab. Figure 7 show shows how the users accesses access the options to sett set the zones and assign the zone-specific parameters. The maximum number of zones needed is set by entering the appropriate number in the # of Zones field. To edit a specific zone, the user should scroll to the desired zone using the up/down arrow control.
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