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GALVESTON ISLAND GEOHAZARDS MAP

James C. Gibeaut Bureau of Economic Geology Jackson School of Geosciences The University of Texas at Austin City of Galveston March 8, 2007. GALVESTON ISLAND GEOHAZARDS MAP. Texas Coast. Barrier Island Cross Section. Protective Ridge. Bay. Gulf. Wetland. Upland. Island Core.

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GALVESTON ISLAND GEOHAZARDS MAP

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  1. James C. Gibeaut Bureau of Economic Geology Jackson School of Geosciences The University of Texas at Austin City of Galveston March 8, 2007 GALVESTON ISLAND GEOHAZARDS MAP

  2. Texas Coast

  3. Barrier Island Cross Section Protective Ridge Bay Gulf Wetland Upland Island Core Upland Wetland Upland Beach/ Dune Future Wetland Today Future Beach/Dune After 60 Years of Sea-Level Rise and Erosion Protective Ridge Wetland Island Core Beach/ Dune Upland Wetland Upland

  4. Galveston Island

  5. Matagorda Peninsula

  6. Average Annual Shoreline Change Rate1930 - 2000 and 1974 - 2000 End of Seawall San Luis Pass

  7. 2060 Projected Shoreline

  8. Galveston Island State Park, Pre-Frances, August 8, 1998 (profile BEG-02)

  9. Galveston Island State Park, Post-Frances, September 16, 1998 (profile BEG-02)

  10. Galveston Island State Park, April 27, 2006 (profile BEG-02)

  11. Beach/Dune Profile Translation

  12. Foredune Mapping

  13. Foredune Mapping landward dune line shoreline

  14. Barrier Island Cross Section Protective Ridge Bay Gulf Wetland Upland Island Core Upland Wetland Upland Beach/ Dune Future Wetland Today Future Beach/Dune After 60 Years of Sea-Level Rise and Erosion Protective Ridge Wetland Island Core Beach/ Dune Upland Wetland Upland

  15. Barrier Island Environments

  16. Total Estuarine Marsh Area From White et al., 2004

  17. Causes of Wetland Loss • Development/Land Use • Global Sea-Level Rise • Land Subsidence • Topographic/Morphology Effects • Sediment Deficit • Marsh Edge Erosion by Waves and Currents

  18. Development 1956

  19. Development 1979

  20. Pier 21 - Galveston 180.0 160.0 140.0 120.0 100.0 Average water level (cm) y = 0.652x - 1145.6 Global ocean-level rise 80.0 2 R = 0.9436 60.0 4.36 + 2.16 = 6.52 mm/yr 40.0 20.0 Local land subsidence 0.0 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 Year Relative Sea-Level Change

  21. Changes Due to Relative Sea-Level Rise

  22. Shoreline Change From Gibeaut et al., 2003

  23. Model Flow Future date reached? DEM (original) Classify habitat types according to elevation Habitat grid Yes No Adjusted DEM Apply vertical accretion adjustment Output habitat grid 1-year loop Apply global sea level adjustment Shoreline change grid Retreat shoreline Compute statistics of habitat status Apply local subsidence adjustment Maps Statistics Graphs

  24. Projected Marsh Change

  25. New Development(post geohazard mapping)

  26. Geohazards Map Units West Bay Gulf of Mexico

  27. Post Hurricane Carla, 1961

  28. Area of enhanced potential for washover Natural protective ridge Storm washover paths

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