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Viewing Opt | Velocities displays the velocity vectors and magnitudes for the model. The velocities from a run are stored in the EFDC_+ Explorer linkage file EE_VEL.OUT file. The first option the user needs to select is the layering option. There are three ways to handle the layers; depth averaged, a specified layer or display all layers. For the All Layers option, the vectors for each cell are to correspond to the layer, blue for layer 1 and red for layer KC.

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The Show Flow checkbox, when checked, causes EFDC_+ Explorer to report flows instead of velocities when LMC'ing on the form and when cutting a profile.

EFDC computes the velocities on the south and west faces of a cell. These are the velocities saved in the linkage file. When displaying the velocity field, EFDC_+ Explorer transforms the cell face velocities in IJ space to cell centered velocities in XY space. When computing fluxes, EFDC_+ Explorer uses the IJ space cell face velocities.

Profile Tool

EFDC_+ Explorer provides a quick method for displaying a velocity profile or a flow profile, if the option "Show Flows" is checked. While in the velocity view, RMC on a cell located on one side of the desired profile location. A popup menu will ask the user if they want to generate a "Profile". When clicked the message "Starting i, j = ?,?". Now select the end point with the Right Button". Press OK to continue. If the next mouse click is a RMC, EFDC_+ Explorer will extract the velocities or flows from the cells between the two cells selected, inclusive. Multiple profiles can be extracted, However, they will all be for the current time.

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Another method to extract flows across certain cell boundaries is provided via the Flux Tool. This method calculates the flow across one or more flux lines contained in the P2D file. Selecting the Flux Tool button display the option form shown in Figure 1.

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Figure 1 Figure 1

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Figure 1. Water flux tool control options.

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If the "Poly File" has more than one section/flux line defined, EFDC_+ Explorer will compute the fluxes for all the defined lines (up to 10 max). Figure 2 shows an example of total discharge using the dominant flow option for the San Francisco Bay application.

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Figure 2 Figure 2

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Figure 2. Water Flux tool example results using Dominant Flow.

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The Velocity Profile feature allows the user to pass a straight line over the model domain for the cells in which a 2-D velocity profile is to be displayed. This feature is different from the longitudinal profile that is located on the top menu on View Plan. The user may access this function with RMC within the model domain to select the Profile option as shown in Figure 3. The location where the user RMCs, that would be the starting point for the new profile. The user is then prompted to the end the line with another RMC. Multiple lines may be created and plotted together by starting a new profile where the user is asked whether to add, reset or abort the new profile. If the user selects "add", then the multiple profiles would be plotted on the same plot.

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Figure 3 Figure 3

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Figure 3. ViewPlan: Velocity Profile Selection.

An example of the profile is shown in Figure 4.

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Figure 4 Figure 4

Figure 4. ViewPlan: Velocity Profile.

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If the user has selected All Layers in the Layer Settings then the user can optionally plot the average current velocity for the water column entirely or partly. This feature is primarily used when an exact comparison of model results with measured data is required in cases where the depth below the surface of the measuring device is known. For the settings shown in Figure 5 EE will produce the plot shown in Figure 6 for all layers. From (%) is used to indicate the percentage of the water column to be displayed from the bottom of the water column up to the To (%). For example, in a 10 m water column, from 10% to 90% means the velocity magnitude it will be plotted from 1 m above the bottom and up to 9 m from the bottom.

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Figure 5 Figure 5

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Figure 5. ViewPlan: Time Series – Velocity Orientation Output.

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Figure 6 Figure 6

Figure 6. Velocity Projection Plot for all layers (layers 2, 4, 6, 8 hidden for clarity).

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Figure 7 Figure 7

Figure 7. Time Series: Rose Plots for Velocity.

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Figure 8 Figure 8

Figure 8. Multiple Velocity Rose Plots.