![]() ![]() ![]() This method can also be used for adding high ground, simply by flipping the cross sections "upside down". This new surface can then be used to create a new terrain model that combines the channel surface (with top priority) along with the other terrain files. Using the River centeline, cross sections, and bank lines, RAS Mapper can be used to create in interpolated surface of the channel or channel and overbanks. This is often a convenient method for improving a terrain model where a 1D model exists for the channel portion of the land surface. Cross Section Interpolation SurfaceĬross sections can be used to create a ground surface model for use with HEC-RAS. Terrain Modifications can be performed using Cross Sections to create an interpolation surface or using the Terrain Modification Tools to create vector additions to a RAS Terrain. RAS Mapper supports many different raster formats however, the Terrain Modification tools work specifically with the RAS Terrain layer to create a compilation of vector additions to the underlying GeoTiff representation of the grounds surface. There are currently two methods for improving channel data in HEC-RAS: (1) using cross sections to create an interpolation surface to add to an existing terrain model (2) using the vector Terrain Modification tools in RAS Mapper to improve the terrain by adding channel information, adding high ground (such as a road), adding features that impede flow (such as piers), or otherwise modifying the terrain elevations. If the initial terrain model insufficiently represents the ground surface, HEC-RAS provides tools for improving the terrain data directly in RAS Mapper. A good terrain model accurately describes the elevations of the river channel and floodplain by incorporating important features that control the movement of water, such as the channel bottom and channel banks, and high ground such as roadways and levees. The basis for any accurate river hydraulics model is a good representation of ground surface elevations for the river and floodplain areas. ![]()
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