Welcome to CivilGEO Knowledge Base
Welcome to CivilGEO Knowledge Base
Welcome to CivilGEO Knowledge Base
Welcome to CivilGEO Knowledge Base
Breaklines are used to define sudden breaks in the terrain surface and interruptions in surface water flow. Breaklines should be added where there are:
Breaklines force the 2D mesh cell faces to align with the breakline and prevent cells from crossing the breakline. Breaklines are critical to create an accurate 2D mesh so that the mesh properly represents an accurate bathymetric model.
In GeoHECRAS 2D, flow area breaklines can be defined by either drawing or assigning breaklines on the Map View using the following commands:
The Draw/Assign 2D Flow Area Breaklines command is used to manually draw/assign multiple breaklines on the Map View, one after another, until completed.
Follow the steps below to use the Draw/Assign 2D Flow Area Breaklines command:
The following sections describe how to use the Draw and Assign 2D Flow Area Breaklines commands and interact with the above dialog boxes.
The Draw Breakline Polyline section is used to draw 2D flow area breaklines on the Map View using polylines. To draw a breakline polyline, follow the steps below:
The Select Breakline Polylines/Polygons section is used to assign breaklines from previously defined CAD or GIS polylines/polygons on the Map View. To assign breakline polylines/polygons, follow the steps below:
This section is common to both the Draw 2D Flow Area Breaklines and Assign 2D Flow Area Breaklines dialog boxes and allows the user to define additional parameters to control how 2D cells are created in the vicinity of the breakline.
The following options are provided in this section:
When all the data have been defined, click the [Apply] button to complete the process of drawing or assigning breaklines.
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