Lecture 7 HEC-RAS and Geo-RAS by qingqing19771029

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									            CEE 795
Water Resources Modeling and GIS
                  Lecture 7: HEC-RAS and Geo-RAS
                            March 6, 2006



  Learning Objectives:
  • Describe the HEC-River Analysis System (RAS)
    Model
  • Utilize HEC Geo-RAS to import data into RAS


Handouts:                             Assignments:
Ras-example.doc                       Exercise #6
HEC-RAS
• River Analysis System
• Developed by Hydrologic Engineering
  Center (HEC)
• One dimensional steady and unsteady
  flow analysis
• Subcritical, supercritical, and mixed
  flow regime calculations
HEC-RAS cont.
• Manual Data Input Required
  –   stream centerline
  –   cross sections
  –   Manning’s “n”
  –   flow data
Main Menu
Geometric Data (stream configuration)
Cross Sections
Table Output
Profiles
HEC GeoRAS
• Pre-RAS processor
  – Creates HEC-RAS input file
  – Input Needs
     • Triangular Irregular Network (TIN)
     • Land Use Data
HEC GeoRAS
• Developed by Hydrologic Engineering
  Center (HEC)
• pre and post Data Processor for the
  River Analysis System (HEC-RAS)
HEC GeoRAS
(creating a TIN from topography)
HEC GeoRAS
(creating a TIN from topography)
HEC GeoRAS
(input Triangular Irregular Network)
HEC GeoRAS
• Pre-RAS processor
  – Saves time on data input
     • no manual cross section entry
     • no manual Manning’s “n” entry
HEC GeoRAS (Pre-Processing)


               Centerline


                       Banks



      Cross Sections
HEC GeoRAS (Cross Section)
HEC GeoRAS
• Post-RAS processor
  – Accepts HEC-RAS output file
  – Output Formats
     • Creates floodplain TINs
     • Creates depth and velocity maps
  – Saves time on data presentation
HEC GeoRAS (Post Processing)
HEC GeoRAS (Floodplain Delineation)

								
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