Tacloban geohazard assessment report [12.05.13]

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Tacloban geohazard assessment report [12.05.13]

  1. 1. Geohazard Assessment of Leyte Province Nationwide Operational Assessment of Hazards
  2. 2. BACKGROUND • Supertyphoon Yolanda (international name Haiyan) • Tacloban City, Leyte
  3. 3. Yolanda’s typhoon path moving west north west
  4. 4. Location Map of Leyte Province. Leyte is highlighted in red. Tacloban is highlighted in blue, while Eastern Visayas (Region VIII) is in yellow.
  5. 5. Tacloban Demographic Data 2012 Census of Population and Housing (CPH, 2013a) Google Maps image of Tacloban and its surrounding municipalities
  6. 6. Materials Used in Building the Occupied Housing Units in Tacloban Outer Walls
  7. 7. Materials Used in Building the Occupied Housing Units in Tacloban Roofing
  8. 8. STORM SURGE SIMULATION The JMA Storm Surge Model is a numerical model developed by the Japan Meteorological Agency (JMA) to simulate and predict storm surges mainly caused by tropical cyclones.
  9. 9. Parameters for Storm Surge Modeling Storm track Maximum wind speed, Central atmospheric pressure, Bathymetry.
  10. 10. JMA Storm Surge Model of Yolanda
  11. 11. http://blog.noah.dost.gov.ph Highest predicted storm surges for November 8, 2013 1:00 pm.
  12. 12. NOAA Comet Program Difference between a storm surge and storm tide. NOAA Comet Program difference between a surge on a steep seafloor and gently-sloping seafloor.
  13. 13. Storm tide height for San Juanico Strait, Tacloban City
  14. 14. Storm Surge Hazard for North of Leyte (READY PROJECT) Source: http://www.geoportal.gov.ph/ (5:01 PM – 09-25-13)
  15. 15. Rain-Induced Landslide Hazard Map for North of Leyte (source: MGB) Source: http://www.geoportal.gov.ph/ (5:25 PM – 09-25-13)
  16. 16. SHALLOW LANDSLIDE SUSCEPTIBILITY SIMULATION
  17. 17. Shallow Landslide Susceptibility Map for North of Leyte
  18. 18. ALLUVIAL FAN AND DEBRIS FLOW SIMULATION
  19. 19. • Based from the apex of the alluvial fan in the municipality of Kananga, Leyte, a total of 13 barangays are at a risk of debris flows.
  20. 20. Landslide Inventory Map for Leyte Province
  21. 21. Number of Landslides per Municipality Tomas Oppus Tacloban St. Bernard Sogod Silago Padre Burgos Ormoc City Merida Matalom Malitbog Mahaplag Liloan Libagon Kananga Hinunangan Hindang Dagami Bontoc Albuera Alangalang Abuyog 0 5 10 15 20 25
  22. 22. % Area Affected Tomas Oppus Tacloban St. Bernard Sogod Silago Padre Burgos Ormoc City Merida Matalom Malitbog Mahaplag Liloan Libagon Kananga Hinunangan Hindang Dagami Bontoc Albuera Alangalang Abuyog 0 5 10 15 20 25 30
  23. 23. Inventory of Landslides in Leyte
  24. 24. Landslide Statistics Map for Leyte Province
  25. 25. STRUCTURALLYCONTROLLED LANSLIDE SIMULATION Coltop3D – simulates a 3D model of the DEM showing the dip and dip direction of its different discontinuity sets. Matterocking - computes and estimates the locations where rock instabilities can occur based on the identified discontinuity sets that allow sliding
  26. 26. Potential Rockslide Zones in Tacloban City, Leyte
  27. 27. Portion of Leyte and Southern Leyte Potential Rockslide Zones
  28. 28. Saint Bernard, Hinunangan, Libangon and Liloan Potential Rockslide Zones
  29. 29. Guinsaugon Area Potential Rockslide Zones and Rock Mass Propagation Extent

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