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Flood Analysis in Ohio River Basin: ArcView GIS for HEC-RAS

Experience converting HEC-2 data to HEC-RAS, creating cross sections, and generating inundation mapping using ArcView GIS for flow computation in Ohio River Basin. Detailed procedure outlined for spatial data management, cross section generation, pre-processing, hydraulic flow computations, DEM production, post-processing, and final inundation map production.

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Flood Analysis in Ohio River Basin: ArcView GIS for HEC-RAS

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  1. Experience of Flood Analysis in the Ohio River Basin Using ArcView GIS for HEC-RAS Flow Computation by David M. Beekman and Vito A. Cimino Co-authored by Dr. Tiao Chang Department of Civil Engineering, Ohio University Terri Dawson, Coy Miller, Jerry Web US Army Corps of Engineers, Water Resources Engineering

  2. Objectives • Convert existing HEC-2 data to HEC-RAS • Generate channel cross sections using HEC-2 data • Geo-Reference data using ArcView GIS • Present Inundation Mapping

  3. Alum Creek Project Location

  4. What’s Required? Data • Existing HEC-2 data for desired reach • USGS 1:24,000 DLG data Software • HEC-RAS • ArcView GIS

  5. Procedure Outline • Spatial Data Management • Cross Section Generation • Pre-processing • Hydraulic Flow Computations • Final DEM Production • Post-processing • Final Inundation Map Production

  6. Spatial Data Management • Download USGS 1:24,000 DLGs • Hypsography • Hydrography • Roads • Convert to shapefiles in ArcView • Delineate stream centerline and banks

  7. Cross Section Generation • Analysis of HEC-2 Data • Cross section lengths • Distance between • adjacent cross sections • Cross section elevations

  8. Cross Section Generation (cont.) • Application of ArcView • Constructed manually • Based on topography and cross section survey data • Cross section stationing and distance calculations • (use of AVRAS 2.2 – ArcView extension)

  9. Geo-Referenced Cross Sections

  10. Pre-processing • Preparation of temporary terrain TIN • USGS hypsography DLGs • Implement AV-RAS options in ArcView • (use of AVRAS 2.2 – ArcView extension)

  11. Pre-processing (cont.) • Select AV-RAS theme setup • TIN • Cross sections • Centerline • Banks • Flow path

  12. Pre-processing (cont.) • Complete remaining AV-RAS options • Generate *.geo file • Import file for HEC-RAS • Consists of ArcView geometric data

  13. HEC-2 X-sections • Preprocessed X-sections

  14. Hydraulic Flow Computation • Adjust GIS geometry file according to HEC-2 data in HEC-RAS • Ground elevations • Cross section lengths

  15. Hydraulic Flow Computation • Adding parameters • Manning’s‘n’ values • Contraction/Expansion coefficients • Bridges/Piers • Steady flow data • Run water surface profile computations • Model verification • Generate *.gis file (HEC-RAS export file)

  16. Final DEM Production • Run Avenue script to export cross sections into ArcView • Cross section and point elevation shapefiles generated • Based on HEC-RAS geometry data • Point elevation data (original HEC-2 data) • Topographical elevation data (USGS data) • Final DEM produced

  17. Final DEM

  18. Post-processing • Implement RAS-AV options in ArcView • (use of AVRAS 2.2 – ArcView extension)

  19. Post-processing (cont.) • Select RAS-AV theme setup • HEC-RAS *.gis export file • Creation of output directory • Terrain TIN • Rasterization cell

  20. Post-processing (cont.) • Complete remaining RAS-AV options • Select desired water surface elevations • Floodplain delineation

  21. Alum Creek Floodplain 4,200 cfs 6,500 cfs 8,100 cfs 13,600 cfs

  22. Final Inundation Mapping 4,200 cfs

  23. Final Inundation Mapping 6,500 cfs

  24. Final Inundation Mapping 8,100 cfs

  25. Final Inundation Mapping 13,600 cfs

  26. Conclusions • Converted HEC-2 data to HEC-RAS • Created cross sections to geographically reference HEC-2 data with ArcView GIS • Performed hydraulic flow analysis with HEC-RAS • Presented Inundation Mapping for floodplain delineation

  27. Acknowledgements Ohio University U.S. Army Corps of Engineers, Huntington District

  28. Questions?

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