Welcome to CivilGEO Knowledge Base
Welcome to CivilGEO Knowledge Base
Welcome to CivilGEO Knowledge Base
Welcome to CivilGEO Knowledge Base
Cross sections are located at intervals along a stream to characterize the flow-carrying capability of the stream and the adjacent floodplain. They should extend across the entire floodplain and should be perpendicular to the anticipated flow lines. Sometimes it is necessary to layout cross sections in a curved or a dog-leg alignment to meet this requirement. They should not intersect each other and should remain perpendicular to the main channel.
In GeoHECHMS, cross sections can be defined by either drawing or assigning polylines on the Map View using the following commands:
The Draw/Assign Cross Sections command allows the user to manually draw/assign polylines on the Map View as cross sections one after another until completed as well as to extract the cross section geometry from the underlying ground terrain.
Follow the steps below to use the Draw/Assign Cross Sections command:
Note that the user can press the shortcut key (Ctrl+D) to automatically start the Draw Cross Sections command.
The following sections describe how to use the Draw and Assign Cross Sections commands and interact with the above dialog boxes.
This section is used to interactively draw a polyline on the Map View to assign it as a cross section. It is highly recommended that the rest of the dialog box input parameters be defined before drawing the cross sections on the Map View. These parameters define information, such as how the cross section IDs should be numbered and where the cross section geometry will be extracted from.
To draw cross section polylines, follow the steps below:
The Select Cross Section Polylines section can be used to manually assign polylines on the Map View as a cross section.
To assign polylines as a cross section, follow the steps below:
This section is common to both the Draw Cross Sections and Assign Cross Sections dialog box and is used to specify the cross section ID for each drawn/assigned cross section. The user can assign these IDs either manually or automatically using some predefined formats.
Follow the steps below to assign cross section IDs:
Note that if the auto-name option is enabled and the user returns to the dialog box, the [Apply] button is disabled since the just drawn/assigned cross sections have already been named and created.
This section is common to both the Draw Cross Sections and Assign Cross Sections dialog box and is used to define the geometry extraction specifications for each drawn/assigned cross section.
This tabbed panel is used to define the data extraction specifications for the selected cross sections.
This optional section is used to define the elevation data source(s) to be used for extracting the cross section geometry. The user can use the Primary and Secondary Elevation Data panels to define the primary and secondary (if available in the project) elevation data sources for extracting the cross section geometry. Depending upon the elevation data source type that is selected, different options are provided to specify additional elevation data information.
Refer to this article in our knowledge base for information on the types of terrain elevation data that can be used for constructing cross sections.
When a secondary elevation data source is available, the software will form a concave hull around the primary elevation data source to identify its bounds. For locations where elevation data from the primary data source are unavailable, the software will use the elevation data from the secondary data source.
Note that the user cannot utilize the same data source to define both primary and secondary elevation data.
The user can click the [Swap Sources] button to swap the selected elevation source from primary elevation data to secondary elevation data and vice versa.
If this section checkbox is unchecked, then the subsequent section below it (Cross Section Geometry Extraction Control section) will be unavailable (i.e., grayed out).
This optional section is used to control the amount of cross section geometry to extract for the drawn cross section polylines. This assures that an adequately deep enough cross section is created on both sides of the river reach. The software will attempt to retrieve the cross section geometry data to the depth specified within the specified maximum cross section width.
If the drawn polyline does not extend outward far enough to get the cross section depth specified, the software will automatically extend the constructed cross section further outward. Similarly, if the drawn polyline extends too far outward for the depth specified, the software will automatically trim the constructed cross section.
During the extraction of the cross section geometry, the software will automatically assign a default Manning’s roughness for the left overbank, channel, and right overbank areas. However, the user can adjust these Manning’s roughness values in the Roughness tabbed panel.
Note that while defining Manning’s n values, the user can click the […] button to display the Manning’s Roughness dialog box. This dialog box provides a reference to Manning’s roughness coefficients for some commonly used surface materials.
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