This manual presents creating HEC-RAS 2D Flow Areas in RiverGIS plugin. For 1D geometry and how to start working with RiverGIS, refer to previous section.
2D flow functionality is introduced in HEC-RAS version 5.0. Users are strongly encouraged to read the 2D Modeling with HEC-RAS 5.0. Also The RAS Solution Blog is a great source of information about new HEC-RAS releases and 2D modeling.
RiverGIS builds 2D HEC-RAS geometry using following river database tables created by a user:
Jun 03, 2009 HEC-RAS Help or Troubleshooting Written by Chris Goodell, P.E., D. WRE WEST Consultants. Now-a-days, you can get to the manuals directly though the Help menu item in HEC-RAS. These manuals are very well written. It is quite possible that the answer to your question is already documented in the manuals. Chapter 20 in the users manual. HEC-RAS 2D Geometry¶ This manual presents creating HEC-RAS 2D Flow Areas in RiverGIS plugin. For 1D geometry and how to start working with RiverGIS, refer to previous section. 2D flow functionality is introduced in HEC-RAS version 5.0. Users are strongly encouraged to read the 2D Modeling with HEC-RAS 5.0. Apr 25, 2016 This is very simple and the most straightforward flow modeling using HEC-RAS 5.0 which is capable of hydraulic modeling in 2-dimensional space. The input files are not that much accurate and you. US Army Corps. Of Engineers Hydrologic Engineering Center. HEC-RAS River Analysis System. Hydraulic Reference Manual Version 5.0 February 2016 Approved for Public Release. Distribution Unlimited. CPD-69 Form Approved OMB No. REPORT DOCUMENTATION PAGE. Public reporting burden for this collection of information is estimated to average 1 hour per response.
Importing 2D geometry data¶
Users can edit the tables with QGIS geometry editing tools or import geometries and attributes from another data source. Here, we will import spatial data for 2D flow objects from modified Bald Eagle example data — the same we used for 1D modeling section. In addition to 1D geometry objects we will use 2D tab of the import dialog to load 2D flow areas, breaklines and breakpoints:
All the target tables should be automatically added to the map canvas after the import. If they are not, use the tool to load all river database tables into QGIS project.
Creating 1D base model¶
First, run all the 1D tools to build the base model for 2D flow areas.
Creating 2D mesh¶
Next, check the user defined attributes of the
FlowAreas2D and BreakLines2D layers using their attributes table, as shown below.
Create 2D Computational Points¶Hec Ras User's Manual
Creates computational points for each 2D flow area.
If the mesh has to be aligned to a structure, use breaklines (
BreakLines2D ):
If special locations of cell faces are needed, use breaklines with breakpoints:
The breakpoints are especially useful when modeling groins, as shown below.
Preview 2D Mesh¶
Creates a preview of 2D mesh with QGIS Processing algorithm (Voronoi polygons).
Save 2D Points to HEC-RAS Geometry¶
Saves the mesh points to a chosen HEC-RAS Geometry file (*.g**). If the chosen file is an existing geometry, the 2D flow areas will be added to it. If the file doesn’t exist, a new empty geometry will be created.
Note
There is no documentation for 2D Flow Areas in HEC-RAS GIS Import file format (SDF). Monica potter. Therefore, the mesh points are written to a geometry file. Please, close the geometry file before writing to it.
HEC-RAS stands for Hydraulic Engineering Center, River Analysis system, as the name suggests, Hydraulic Engineering Center (HEC) has developed this River Analysis System (RAS). Hydraulic Engineering Center (HEC) is situated in Davis, California, USA. HEC-RAS is a computer program/software that allows you to perform one-dimensional steady and unsteady flow river hydraulics calculation including modeling and analysis. HEC-RAS supports multi-tasking, multi-user network environment which means if in your office you have a networked environment you can share the calculations, models, results and reports.
Hec Ras 5.0 User S Manual![]() What is HEC-RASHEC-RAS provides a rich Graphical User Interface (GUI) where it has various components like hydraulic analysis components, data storage, management, graphics and reporting components.
HEC-RAS supports one-dimensional analysis of river flow; that means if the cross-sectional shape changes, if bends are there or other two or three dimensional aspects are there, their hydraulic effects would not be included in the modeling and analysis.
For What Purpose HEC-RAS is UsedWith the help of HEC-RAS you can do; ![]()
Although HEC-RAS is easily available free of cost from US- Army Corps of Engineers’ website, but in some countries it is difficult to access so this page and website will help other to get the full advantage of this free software and get the ultimate benefit.
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You can download HEC-RAS by clicking the button below; or right click and then click Save Link As; after which give a certain destination; you are done;
Download HEC-RAS full free with User Manual
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