Hec ras

3,277 views
3,001 views

Published on

HEC-RAS is a computer program that models the hydraulics of water flow through natural rivers and other channels. The program is one-dimensional, meaning that there is no direct modeling of the hydraulic effect of cross section shape changes, bends, and other two- and three-dimensional aspects of flow. The program was developed by the US Department of Defense, Army Corps of Engineers in order to manage the rivers, harbors, and other public works under their jurisdiction; it has found wide acceptance by many others since its public release in 1995.

Published in: Technology
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
3,277
On SlideShare
0
From Embeds
0
Number of Embeds
15
Actions
Shares
0
Downloads
199
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Hec ras

  1. 1. By Karan Tyagi
  2. 2.  Stands for Hydrologic Engineering Centre (Based in California, USA)  RAS stands for River Analysis System.
  3. 3.  HEC-RAS is a computer program that models the hydraulics of water flow through natural rivers and other channels. The program is one-dimensional, meaning that there is no direct modeling of the hydraulic effect of cross section shape changes, bends, and other two- and three-dimensional aspects of flow. The program was developed by the US Department of Defense, Army Corps of Engineers in order to manage the rivers, harbors, and other public works under their jurisdiction; It was developed in 1995 and has found wide acceptance in hydrologic community since.
  4. 4.  The Hydrologic Engineering Center[1] (HEC) in Davis, California developed the River Analysis System (RAS) to help hydraulic engineers in channel flow analysis and floodplain determination. It includes numerous data entry capabilities, hydraulic analysis components, data storage and management capabilities, and graphing and reporting capabilities.
  5. 5.  The basic computational procedure of HEC- RAS for steady flow is based on the solution of the one-dimensional energy equation. Energy losses are evaluated by friction and contraction / expansion. The momentum equation may be used in situations where the water surface profile is rapidly varied. These situations include hydraulic jumps, hydraulics of bridges, and evaluating profiles at river confluences.
  6. 6.  For unsteady flow, HEC-RAS solves the full, dynamic, 1-Dimensional Saint Venant Equation using an implicit, finite difference method.  HEC-RAS is equipped to model a network of channels, a dendritic system or a single river reach. Certain simplifications must be made in order to model some complex flow situations using the HEC-RAS one-dimensional approach. It is capable of modeling subcritical, supercritical, and mixed flow regime flow along with the effects of bridges, culverts, weirs, and structures.
  7. 7.  HEC-RAS is a computer program for modeling water flowing through systems of open channels and computing water surface profiles. HEC-RAS finds particular commercial application in floodplain management and flood insurance studies to evaluate floodway encroachments. Some of the additional uses are: design and analysis of bridge and culvert and channel modification studies. It can also be used for dam breach analysis.
  8. 8.  Necessary for planning, flood risk reduction, design, environmental impact assessment and mitigation, restoration 9/8/2013 1a -8
  9. 9.  Velocity  Depth  Shear  Width  Area  etc 9/8/2013
  10. 10.  1D River Hydraulics  Graphical User Interface  Steady & Unsteady Flow  Bridges, Culverts, Dams, weirs, levees, gates, etc…  Data storage/management  Graphics, Tabular Output & Reporting  GeoRas – ArcGIS  More coming……… 9/8/2013
  11. 11.  Geometry ◦ Cross Section ◦ Spacing ◦ Structures ◦ Manning’s n  Flows ◦ Calibration Data 9/8/2013
  12. 12. 9/8/2013
  13. 13.  Graphical  Tabular  Profile  Section 9/8/2013
  14. 14. 9/8/2013
  15. 15. From NRCS workshop by Reep, 2004 9/8/2013
  16. 16. From NRCS workshop by Reep, 2004 9/8/2013
  17. 17.  HEC-RAS has merits, notably its support by the US Army Corps of Engineers, the future enhancements in progress, and its acceptance by many government agencies and private firms. It is in the public domain and peer-reviewed, and available to download free of charge from HEC's web site. Various private companies are registered as official "vendors" and offer consulting support and add on software. Some also distribute the software in countries that are not permitted to access US Army web sites. However, the direct download from HEC includes extensive documentation, and scientists and engineers versed in hydraulic analysis should have little difficulty utilizing the software.
  18. 18.  Aquaterra  Aquaterra is a professional software for canals and river engineering works design. Seamless integration in CAD environment makes it really easy to learn and use. Engineers use Aquaterra to create detailed designs as well as for conceptual studies and designs. HEC-RAS interface is intended for communication between CAD environment and HEC-RAS. This module prepare the HEC-RAS geometric input file based on cross sections, Manning coefficient data and transfer the resulting water levels back to Aquaterra.
  19. 19.  ArcView  HEC-RAS can also be used in the GIS program, ArcView (With 3-D analyst and spatial analyst extensions). ArcView can read-in AutoCAD drawings for backgrounds and can create a DTM. In a similar way to river CAD, GEO-RAS can be used to create cross sections and other geometrical data for use in HEC-RAS and can be used to export water surface data from HEC-RAS back into ArcView to create flood maps with depths and extents of flooding.
  20. 20.  AutoCAD  HEC-RAS can be used along with AutoCAD. A digital terrain model (DTM) can be constructed in AutoCAD and sections can be cut from the DTM and imported into HEC- RAS.
  21. 21.  RiverCAD  RiverCAD by BOSS International Inc. supports the latest version of HEC-RAS and HEC-2[ and is a standalone AutoCAD compatible application.  (needed: impartial review of this commercial product)
  22. 22.  WMS (Watershed Modeling System) provides pre and post-processing tools for use with HEC-RAS. The development of WMS was funded primarily by The United States Army Corps of Engineers. It is a commercial software.
  23. 23.  Public Domain/Free/Widely used  Supported by Corps of Engineers  Continuing Improvement ◦ 2-D capabilities being developed ◦ Expected by end of 2012  Graphical Abilities  Good Documentation  Training Available 9/8/2013

×