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Guest Chris Nielsen

Cell elevation commands - a layered approach to mesh building

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Guest Chris Nielsen

The command line “cell elevation” provides an option to insert elevations at some or all cells (or elements) in the model domain. As outlined in the command reference, this is done by providing a csv file that lists the x and y coordinates of the specific cells, then the z values. xy coordinates (instead of the element IDs) are used in case element renumbering is performed as part of the mesh design, however if preferred cell IDs can be used.

 

More than one “cell elevation” command line can be entered, and/or more than one point per cell can be entered.

 

Depending upon input preference each z value will overwrite the preceding z value entry, or an average of all points within each cell will be assigned.

 

This option can be used to address situations where specific, hydraulically important geometric features exist. For example, the invert along a drain could be specified using a single csv file entry (perhaps called “drain 01.csv”). This csv file could be directly extracted from a GIS polyline.

 

Insertion of cell elevation files allows the user to build a number of specific features into the model geometry in a systematic, structured manner, starting from the underlying geometry in the 2dm file and adding specific features (roads for example).

 

Note that the cell elevation file option does not interpolate between successive points. If using the cell elevation file for continuous linear features (such as a road or levee), ensure that the point resolution is sufficiently fine to accurately represent the elevations along the feature, or use the “cell elevation polyline” command.

 

Another option is to apply a single elevation over a polygon; the command “cell elevation polygon”. An example of its application is to assign a specific elevation to cells representing a reclamation or infill of a proposed development.

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