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Methods of Coastal Hazards Assessment

Methods of Coastal Hazards Assessment. David M. Bush Risk Assessment GEOL 4093. Island-scale mapping 1990’s. Originally done by hand on clear plastic overlays and tracing paper We didn’t know at the time that it was GIS Andy and R/V Bicycle Elevation Forest Cover.

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Methods of Coastal Hazards Assessment

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  1. Methods of Coastal Hazards Assessment David M. Bush Risk Assessment GEOL 4093

  2. Island-scale mapping 1990’s • Originally done by hand on clear plastic overlays and tracing paper • We didn’t know at the time that it was GIS • Andy and R/V Bicycle • Elevation • Forest Cover

  3. Island-scale mapping1990’s

  4. Island-scale mapping1990’s • Analog GIS • Andy--R/V • Bicycle • Elevation • Forest Cover

  5. Florida Panhandle, after Opal (1995)

  6. Pawleys Island, SC, after Hugo (1989)

  7. South of Cancun after Gilbert, 1988

  8. B Zone A Zone V Zone Jekyll Island flood zones

  9. Forest No Forest Jekyll Island forest cover

  10. Preliminary Risk Assessment

  11. Water Low Hazard Moderate Hazard High Hazard Extreme Hazard Jekyll Island preliminary hazard assessment

  12. Mainland Mapping Tracy Rice developed this using fetch instead of SLOSH

  13. Risk Rating

  14. Elevation Vegetation Tidal range Bluff configuration Evidence of historical storm impacts Type of structures Density of structures Site relative to stream mouth Soil and drainage Other surrounding features Geo-indicators

  15. Geoindicators AssessmentGeneral Site Parameters

  16. Camden County, GA Study Sites

  17. St. Marys, GA

  18. Elliots Bluff, GA

  19. Puerto Rico Coastal Hazards Maps • Shoreline-setting hazards (long-term problems) • Marine hazards (short-term impacts of storms) • Earthquake and slope hazards (ground shaking, landslides, liquefaction) • Riverine hazards (historical floods) • Development hazards (high-density or dangerous settings) • Engineering hazards (stabilization, nourishment, sand mining)

  20. Methodology, conclusion Each coastal stretch is designated a relative hazard rating based on the following: E = Extreme—more than 4 identifiable hazards H = High—3 to 4 identifiable hazards M = Moderate—at least 2 hazards L = Low—1 or no hazard

  21. Culebra Puerto Rico Vieques

  22. A portion of the Carolina, PR, Coastal Hazard Map.

  23. The portion of Coastal Hazard Map 1, San Juan.

  24. Mitigation • Engineering • Strengthen or move buildings • Armor the coast • Land Use Planning • Limit or reduce development density • Can help implement new techniques such as clustered housing • Easiest with new developments

  25. Our Approach to Mitigation • Coastal landform protection, restoration, augmentation • Mostly low cost • Many things individuals can do • Environmentally sensitive • Considers geologic/oceanographic processes

  26. PAR For the Shore • Preserve, Augment, Restore • Dunes (frontal and interior) • Coastal barriers of all types • Mangroves • Shoals • River mouth bars • Maritime forest • Add new sand to island

  27. Pandora’s Island—Mitigation on the Beach

  28. Pandora’s Island—Mitigation back from the beach

  29. Pandora’s Island becomes Fantasy Island

  30. Harrison County, Mississippi Topographic Map of Study Area

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