Apart from the standard features available in GeoHECRAS, the following features are available in GeoHECRAS 2D:
Adaptive 2D Mesh
In addition to HEC-RAS’ default rectangular (structured) 2D computational mesh, the software can create an adaptive 2D mesh to better represent more complicated 2D flow conditions and structures. The software will automatically refine the 2D mesh where required, such as at a roadway crossing bridge opening.
2D Bridge Analysis
- Circular pier
- Rectangular round nosed pier
- Rectangular sharp nosed pier
- Rectangular square nosed pier
- Square pier
Interactively place and rotate the bridge piers relative to the roadway crossing.
2D Flow Training Structures
Incorporate 2D flow training structures for river and stream restoration projects. Define river structural measures to improve the flow of the river and maintain the channel within the floodway, preventing and reducing river channel migration during flood events. Protect critical infrastructure, like bridge roadway crossings, by directing river flow through the bridge opening during extreme flow events.
The following 2D flow training structures can be stamped into the river model:
- Spur Dikes
- Alternating Dikes
- Bendway Weirs
- Chevron Dikes
- Vanes & Cross Vanes
- And much more…
2D Ineffective Flow Areas
Ineffective flow areas can be assigned to the 2D mesh using polylines or polygons. Alternatively, draw ineffective flow areas on the Map View. For example, stagnant flow areas at roadway crossings can be stamped into the 2D mesh to account for the ineffective flow area. The software will automatically refine the 2D flow area to incorporate the ineffective flow area shape.
2D Conveyance Obstructions
Conveyance obstructions can be assigned to the 2D mesh using polylines or polygons. Alternatively, draw conveyance obstructions on the Map View. For example, buildings and other structures can be stamped into the 2D mesh as conveyance obstructions to account for flow blockage. The software will automatically refine the 2D flow area to incorporate the conveyance obstruction shape.
Auto Fix 2D Mesh Bad Elements
The Army Corps of Engineers HEC-RAS software generates 2D meshes that contain elements that are marked “bad” and require manually fixing by the user. GeoHECRAS will automatically detect and fix these bad elements without requiring any interaction by the user.
Remember 2D Mesh User Edits
As you modify the 2D mesh by inserting additional elements, moving elements, and performing other mesh element editing, the software remembers these edits. Then, the next time the 2D mesh is rebuilt, these user-defined changes are automatically incorporated into the mesh.
Assign Land Cover Data as Manning’s Roughness
Assign land cover polygons and/or National Land Cover Database (NLCD) data as Manning’s roughness to cross sections and 2D flow areas. The National Land Cover Database provides land cover data for the entire United States. The software can dynamically download a NLCD raster land cover grid for the area being modeled. Each 75ft x 75ft land cover grid cell represents a specific land type. Up to 20 different land types and corresponding Manning’s roughness values are provided.
Flood Hazard Maps
Create 2D flood hazard maps, including:
- Flood Arrival Time
- Depth x Velocity
- Depth x Velocity²
- Flood Duration
- Flood Recession Time
- % Time Inundated
Animated Flood Maps
For unsteady flow models, the flood map can be animated to show how it changes with time. The animation speed can be adjusted, as well as set up to loop continuously. The final animation can be recorded to a video. In addition to animating the flood results, options are available to show the extent of the maximum and minimum flood area.
Velocity Vector Maps
Plot velocity vectors on the flood map to represent the flow field for both 1D river reaches and 2D flow areas. The velocity vector length is adjusted to represent the velocity at that point. Velocity vector maps can be created for both steady flow and unsteady flow models.
Particle Tracking Maps
Plot moving particles on the flood map to represent the flow field for both 1D river reaches and 2D flow areas. The size and speed of the particle is adjusted to represent the velocity at that point. Particle tracking maps can be created for both steady flow and unsteady flow models.
Google Earth Map Animation
Export flood map animations to Google Earth. This is helpful for presentations on flood risk assessment and flood management.