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One of the options available when a user creates a new boundary condition is type 8, Jet/plume. The form for editing the Jet/plume BC is shown in Figure 1 2337736. EFDC+ has been enhanced to work smoothly with the EE defined jet/plume settings.
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In the Diffuser Port Settings for Current Cell frame the user may specify the settings for each discharge cell including the number of ports, the elevation and the diameters of the port outlets, as well as the horizontal (azimuth) and vertical (altitude) angles. It should be noted that the flow in the QSER file is multiplied times the number of ports for the total flow for that BC cell. So for example, if a user has 10 ports with each port having a time series of 0.15 cms assigned for the jet, then the total flow is 10 * 0.15 cms = 1.5 cms.
The setting for the jet/plume discharge cell is not dependent on the K value. It is only dependent on the "Elevation" set for the port. For this reason he K box for the cell is greyed out.
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Figure 1 Modify/Edit Jet Plume BC Properties.
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Other options include setting the Entrainment Error Criteria, whichis a factor used in the iterative solution. An adjustment factor for the Froude Number may also be set. EFDC can write out a log file of the Jet/plume in various formats. Specify 1 for full ASCII, 2 for compact ASCII output at each update, 3 for full and compact ASCII output, and 4 for binary output.
Figure 2 2337736 illustrates an application of the jet/plume BC for a temperature distribution in the case of two diffusers in a weak flow stream.
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