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Flood Modeling and Mapping: Histor y and Research Opportunities

Flood Modeling and Mapping: Histor y and Research Opportunities. Venkatesh Merwade S chool of Civil Engineering, Purdue University. Water Community Seminar Series, Oct 14, 2009. What else is going on?. Bathymetry mapping and modeling GIS based hydrologic model development

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Flood Modeling and Mapping: Histor y and Research Opportunities

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  1. Flood Modeling and Mapping: History and Research Opportunities VenkateshMerwade School of Civil Engineering, Purdue University Water Community Seminar Series, Oct 14, 2009

  2. What else is going on? • Bathymetry mapping and modeling • GIS based hydrologic model development • Cyberinfrastructure for hydrologic modeling • Investigating effects of historical land use changes on Midwest hydro-climatology • Soil moisture data assimilation • Water Resources Issues for Developing World (India and Kenya)

  3. Flood Risk Assessment • Flood risk is communicated through flood hazard maps • FEMA Flood Insurance Rate Maps • National Flood Insurance Program • 100,000 maps covering 150,000 sq. miles for 19,200 communities • Map Mod 2004 • Developments in Europe

  4. Model Parameters! Flood Inundation Mapping Train • Hydrologic Modeling – Q • Hydraulic Modeling – WSE • Flood Inundation Mapping – Flood Map Hydrologic Modeling Hydraulic Modeling Flood Inundation Mapping Q WSE Soil Streamflow GIS Precipitation LU/LC Topography

  5. Issues in Flood Risk Assessment • Estimation of Q • Stationary or non-stationary (climate change) • Combined effect of climate and land use • Data, modeling approach and parameters • Estimation of WSE • Q, data, modeling approach and parameters • Maps • Q, WSE, data, geospatial techniques

  6. N Initial Work on Strouds creek and Brazos River L = 6.5 km W= 10m v-shaped valley L = 62 km W= 175m Flat topography

  7. Effect of topography on Flood Inundation Extent Strouds Creek Brazos River

  8. Effect of Geometry Strouds Creek Brazos River

  9. Effect of Modeling Approach 1D HEC-RAS 2D FESWMS

  10. Probabilistic Flood Inundation Maps

  11. FEMA vs SSURGO From SSURGO From FEMA There is more than 90% match between SSURGO and FEMA maps for Tippecanoe County. 11

  12. Flood Risk Information System

  13. Collaborative Ideas • What is the role of tile drains in Midwest flooding? • Effect of low versus high frequency floods on ecology and bio-diversity of Midwest Rivers • Bathymetry dynamics and its effects on aquatic habitats • Effect of climate change on flood risk assessment • Research in flood warning systems?

  14. Thank you! Contact: Venkatesh Merwade – vmerwade@purdue.edu http://web.ics.purdue.edu/~vmerwade

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