From release of EE7.2 the jet plume condition is provided, which was previously only available in EFDC but not accessible from EE. When the user creates a new boundary condition there is now the one of the options available is option of type 8, Jet plume. The form for editing the Jet Plume BC is shown in Jet Plume Boundary Condition Editor. EFDC_DSI + has also been updated enhanced to better work smoothly with the EE defined jet plume settings.
Similar Although similar to a flow boundary condition or withdrawal/return user interfaces, the settings for jet/plume boundary conditions are easier unique to use. Flow this boundary condition. In the Jet/Plume Type drop-down menu the user specifies the flow data of a jet plume boundary can to link to 1. a flow time series (QSER), 2. a withdrawal return time series (W/R time series or be ) or 3. by-passed. The diffuser port
In the Diffuser Port Settings for Current Cell the user may specify the settings for each discharge cell include including the number of ports, the elevation and the diameters of the port outlets and , as well as the horizontal (azimuth) and vertical (altitude) angles.
In the Control Parameters frame the user can set the #Elements, which is the maximum number of vertical computational elements along the length of the jet or plume. The user specify the frequency, in number of time steps, for updating the Jet/plume in #Iterations form.
With the Entrainment Option menu the user may specify whether to use the maximum of shear and forced entrainment, or use the sum of shear and forced entrainment.
The Entrainment Stop menu provides three options for stopping the entrainment: stop at a specified number of elements (ISTJP=0) , stop when the centreline penetrates the bottom or the surface (ISTJP=1), or stop when the boundary penetrates the bottom or the surface (ISTJP=2).
Other options include setting the Entrainment Error Criteria, and an adjustment factor for the Froude Number. EFDC can also write out a log file 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.
Jet Plume Boundary Condition Editor illustrates the temperature distribution in case of two diffusers in a weak flow stream.
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Figure 1 Modify/Edit Jet Plume BC Properties.
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