GeoHECRAS 2D

Breakthrough HEC‑RAS 2D modeling and 3D visualization

GeoHECRAS significantly speeds up HEC‑RAS model creation and review, producing better and more accurate results. Rapidly construct HEC‑RAS models from a variety of data sources. Accelerate engineering workflow and streamline analysis review. Compute water surface profiles for steady and unsteady flow models, bridge and culvert roadway crossings, FEMA floodplain encroachments, stream restorations, inline reservoir structures, off-channel storage areas, and much more.

Apart from the standard features available in GeoHECRAS, the following features are available in GeoHECRAS 2D:

Draw 2D Mesh Faces

The Draw 2D Mesh Face command allows the user to draw a mesh patch (or mesh template) and direct the software to honor the drawn patch when generating the mesh. The user can draw element face lines and construct 3-sided and 4-sided mesh elements to make a mesh patch. The command gives the user the ability to control how the HEC-RAS 2D cells are created in areas where a high level of detail is required, such as when 2D cells need to be placed and aligned to satisfy culvert inlet and outlet locations.

2D Floodplain Encroachments

The 2D Floodplain Encroachment command automates the placement and analysis of floodplain encroachments along the river reach when performing a 2D steady or unsteady flow computation. This allows the modeler to have a better understanding of the true flow effects when attempting to determine the floodway in a complex flow situation. The modeler can examine the VxD (velocity x depth) factor, as this directly indicates greater flood hazard and hydraulic importance.

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.

Adaptive 2d Mesh
2D Mesh Feature Stamping

2D Bridge Analysis

Stamp bridge piers into the 2D mesh for the following pier shapes:

  • 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:

  • W-Weirs
  • Spur Dikes
  • Alternating Dikes
  • Bendway Weirs
  • Chevron Dikes
  • Vanes & Cross Vanes
  • J-Hooks
  • And much more…
2D Flow Training Structures
2D Ineffective Flow Areas

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.

2d Conveyance Obstructions
Auto Fix 2D Mesh Bad Elements

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.

Remember 2D Mesh User Edits
NLCD Land Use

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
  • Velocity
2D Velocity Map
Animated Flood Maps

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 areas.

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.

Velocity Vector Maps
Particle Tracking Maps

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.

Google Earth Map Animation
Technical support by experienced HEC-RAS modelers is just a phone call away

Expert Technical Support

Toll-free unlimited technical support by experienced HEC-RAS modelers is just a phone call away. Quickly resolve your 2D HEC-RAS modeling questions and complete your engineering projects on time—our skilled, professional engineers are here to assist you.

Reach us on WhatsApp at +1 (608) 729-5100 CivilGEO on WhatsApp

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