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Figure 1. Waves Tab: External Linkage to SWAN Wave Model.
There are four different sub-options to take into account while assigning the wave parameters into EFDC model as following;
(1) Use Wave Input File
If the user already has a WAVE.INP file (of format shown in Appendix B 12), then the data is imported first time by checking the New Dataset checkbox. If a WAVE.INP has already been imported then the import options described below are greyed out until the New dataset box is selected.
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This is an option for EE7 and earlier and it is not advised be used due to the longer time required to prepare the input data. For ISWAVE=1 and ISWAVE=2 the external model results may be imported into EFDC_Explorer which will generate the required wave linkage file, depending on the ISWAVE option. Figure External Wave Model Option#Figure 2 shows the main import/field interpolation form for the wave parameters for ISWAVE=2. The user must match the input data file (which should be in XYZ format tab, space or comma delimited) to the parameter specified on drop down list Wave Field Parameters (options shown in adjacent inset). The user can either have wave height (2*wave amplitude) or wave energy. EE will compute the one from the other. The user has the option of using a polygon to select which EFDC cells will be used for the assignment. If a Poly file is not selected, then the assignment operation will be for the entire model domain. EE interpolates and converts the wave model results into the formats needed for EFDC. The interpolation process has two options, nearest neighbor interpolation or cell averaging. Cell averaging should be used when the imported data is denser than the EFDC model grid (this will usually be the case). The nearest neighbor interpolation scheme should be used if the imported data is sparser than the EFDC model grid.
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Figure 2. Wave generated turbulence, import data form.
DSI has extensively tested and verified the ISWAVE=2 option for both EE and EFDC using the RefDif/ShoreCirc modeling of rip tide currents (Svendsen, et. al., 2000). Figure External Wave Model Option#Figure 3 shows EFDC_DSI model results for the rip tide test case. The velocity vectors (in white) have been overlaid on the bathymetry. The velocity pattern and magnitude are similar to what was computed by Svendsen.
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Figure 3 3. Wave generated rip tide currents overlaid on idealized beach.
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Currently EE only imports data from the SWAN wave model, however, it is anticipated that other models will be included at a later date. If the user chooses to import the SWAN output files through EE then the Import Wave Model (SWAN) button should be selected. This displays the form shown in Figure External Wave Model Option#Figure 4. The default Work Path is the current model directory. The user should browse to a different directory if they want to avoid saving over an existing WAVE.INP file.
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Figure 4 4. Waves Tab: SWAN Import function when using same grid as EE.