• Hec Ras 5.0 3 User's Manual 1
• Hec Ras 5.0 3 User's Manual 2016

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.

Tutorial on using HEC-GeoRAS with ArcGIS 10.x and HEC-RAS Modeling Prepared. Tutorial please refer to the HEC-GeoRAS users manual. Computer Requirements. The geometry file for HEC-RAS contains information on cross-sections, hydraulic structures, river banks and other physical attributes of river channels. 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. View HEC-RAS 5.0 Reference Manual from CIVIL 125 at Chitral Model College, Chitral. US Army Corps of Engineers Hydrologic Engineering Center HEC-RAS River Analysis System Hydraulic Reference.

1. Oct 01, 2014  I provided a link to the updated version of the User's Manual on how to use the 2D modeling capabilities within HEC-RAS 5.0 Beta ('Combine 1D and 2D Modeling with HEC-RAS.pdf'). This document has been dramatically expanded. If you really want to learn how to use the 2D modeling capabilities in HEC-RAS, Please Read This Manual. I have spent a.
2. HEC-RAS is a tool that has been evolving, and to date, version 5.0 (beta) has an extension that allows to simulate water flow models combining 1D / 2D and fully 2D; It based its application on Diffusive Wave and St. Venant equations (up to the user) which solved by the Finite Volume.

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:

1. FlowAreas2D (required) — a polygon layer representing 2D Flow Areas. It has 2 user defined attributes:

• Name — 2D Flow Area name
• CellSize — a default mesh cell size for a flow area.

2. BreakLines2D (optional) — a polyline layer for aligning cell faces along the breaklines with 3 user defined attributes:

• CellSizeAlong — default mesh points spacing along a structure
• CellSizeAcross — default mesh points spacing across a structure
• RowsAligned — number of mesh rows that should be aligned to a breakline

3. BreakPoints2D (optional) — a point layer for creating a cell face at exact locations along the breaklines (optional). No attributes required.
4. DTM (required) — a digital terrain raster layers set.

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¶

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). Therefore, the mesh points are written to a geometry file. Please, close the geometry file before writing to it.

What is HEC-RAS

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 Used

• Steady water surface profile calculations
• Un-steady water surface profile calculation
• Sediment transport computations
• Water quality analysis
• Bed computations
• Water temperature modeling
• Water quality analysis
• Hydraulic design features are also there; after you have developed the basic water surface profiles are computed

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Hec Ras 5.0 3 User's Manual 2016