The velocity rose features Downstream Projection for velocity feature (available from EEMS10.4) allows the user to display the speed and direction distribution of a given cell over a user-defined period of timespecify an orientation angle (degrees clockwise from north, looking downstream) in order to plot the velocity magnitude of upstream and downstream flow during the EE data extraction.
This feature is available from the 2DH View, from which a velocity layer must be added and the active mode turned on in the Layer Control as presented in 2081718287Figure 1. The user is then able to select a location of interest and the information of the selected cell will be presented in a yellow box.
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Figure 1. The Velocity layer.
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. RMC on the selected cell and click
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Downstream Projection (as shown in
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Figure 1). Use the form shown in
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Figure 2 to select the times to plot within the range of the whole model time (provided at the top of the form)
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. Please note that the time format is presented in Julian date format.
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Figure 2. Select Times to Plot.
The velocity rose of the select cell is presented in 2081718287. The location of the cell being displayed and the time period are shown at the top of the plot. The velocity rose can be attached to the 2DH view or can be floating as a separate window.
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Figure 3. Velocity Rose of a selected cell.
RMC on the plot of velocity rose and select Settings (shown in 2081718287). The Rose Plot Utility provides options for editing the labels, setting the scale, and adjusting the sectors. The user may also save the defined rose plot format and reload it at a later time, or to apply the same formatting style on another cell, using the Save and Load options (2081718287). In addition, it is also possible to export the rose plot as a bitmap and Windows metafile image.
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Figure 4. Settings of the rose plot.
Multiple velocity roses may be displayed by selecting multiple cells in 2DH View as shown in 2081718287 . In the main toolbar, the user can check the Rose Frames option to display a list of rose plots available with detailed information of the location and time period.
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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.
Finally, click the OK button to start extracting and the result is shown in Figure 3.
Anchor Figure 1 Figure 1
Figure 1. The Velocity layer.
Anchor Figure 2 Figure 2
Figure 2. Time Series – Velocity Orientation Output.
Anchor Figure 3 Figure 3
Figure 3. Velocity Projection Plot for the selected cell with all layers.