HEC-RAS-Introduction

1、Dehui Su PhD PE, Senior engineer OTHON INCHouston, Texas77042, USA Phone: 713-975-8555 Fax: 713-975- HEC-RASUS Army Corps of EngineersHydraulic Engineering CenterRiver Analysis SystemDOS Version-HEC-2 -1970sVersion 2.0 (Windows 3.1 or later) - April 1997Version 3.0 (Windows 95/98 or NT(4.0) - 2001Ve

2、rsion 3.1 (Windows 95 or higher) January 2003Version 4.1 (Windows 95 or higher) March 2008HEC-RAS is designed to perform one-dimensional hydraulic calculations for a full network of natural and constructed Hydraulic Analysis Abilities Steady Flow Water Surface ProfilesU

3、nsteaday Flow SimulationSediment TransportWater Quality Analysis Hydraulic Models Steady Flow WSPRO (FHA) WSP2 HEC-2 (last one out in 1991) HEC-RAS (released 1995)Unsteady Flow UNET DAMBREAK HEC-RASHydraulic Capabilities Steady flow water surface profiles - single reach, dendritic, mixed flow regime

4、. Unsteady flow simulation- full network of open channels, adapted from UNET Sediment transport/Movable boundary- long term trends of scour and deposition (not ready, only bridge scour)Hydraulic Parameters Velocity Depth Shear Width Area etcHydraulic Computer Models: Hydraulic Analysis Components Gr

5、aphical User InterfaceFile ManagementData Entry and EditingHydraulic AnalysesTabulation and Graphical Displays of Input and Output DataReporting FacilitiesContext Sensitive Help Flows Geometry Cross Section Spacing Structures Mannings n Calibration Data Graphical Tabular Profile SectionOther Applica

6、tions and Capabilities Bridge Scour Culverts Drop Structures Hydraulic Jumps Split Flow Lateral Weirs In Channel Weirs Gated Spillways and Weirs Vertical Variation in Roughness GIS import and export features (HEC-GeoRAS 3.1 with ArcView)How do you get HEC-RAS?The HEC-RAS software and manual are avai

7、lable for free download from HEC at the following internet address: /Also available through NRCS CCE and NWCC web site.HEC-RAS - Documentationu Users Manual: provides an introduction and overview of the modeling system, installation instructions, how to get started, a sim

8、ple example, detailed descriptions of each of the major modeling components, and how to view graphical and tabular outputv Hydraulic Reference Manual: describes the theory and data requirements for hydraulic calculationsw Applications Guide: contains a series of examples that demonstrate various aspects of HEC-RAS.Limitations Flow is constant with respect to time (unsteady is optional) Flow is gradually varied with distance Dominant flows in x direction (1-D) Channel slopes less than 1:10HWhere do you go for help? On line help HEC-RAS documentation HEC-RAS Sup