Typically you’ll begin with a Cartesian or rectilinear structured mesh and where you add more detail and resolution, you’ll have unstructured (irregular) zones within your mesh. RAS is able to work with structured or unstructured meshes with cells that have up to eight sides. Notice that the mesh remains within the perimeter of the terrain. Here in the geometry editor, we can see the computational mesh “draped” over the terrain. The continuous properties of the “infinite” terrain are then discretized onto the mesh so that computations can be made over a finite domain. Think of a mesh as a net that you drape over your terrain. Your computational mesh is what will allow you to do 2D modeling in HEC-RAS. Written by Christopher Goodell, P.E., D.WRE | WEST Consultants Copyright © The RAS Solution 2014.
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