Tacloban geohazard assessment report [11.28.13]
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Transcript of Tacloban geohazard assessment report [11.28.13]
Geohazard Assessment of Leyte ProvinceDOST - Nationwide Operational Assessment of Hazards
BACKGROUND• Supertyphoon Yolanda (international name Haiyan)
• Tacloban City, Leyte
Yolanda’s typhoon path moving west north west
Location Map of Leyte Province. Leyte is highlighted in red. Tacloban is highlighted in blue, while Eastern Visayas (Region VIII) is in yellow.
Tacloban Demographic Data
Image of Tacloban and its surrounding municipalities
2012 Census of Population and Housing (CPH, 2013a)
Materials Used in Building the Occupied Housing Units in Tacloban
Outer Walls
Materials Used in Building the Occupied Housing Units in Tacloban
Roofing
Soil Map for Leyte Province
STORM SURGE SIMULATIONThe 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.
Storm trackMaximum wind speed, Central atmospheric pressure, Bathymetry.
Parameters for Storm Surge Modeling
JMA Storm Surge Model of Yolanda
Highest predicted storm surges for November 8, 2013 1:00 pm.
http://blog.noah.dost.gov.ph
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.
Storm tide height for San Juanico Strait, Tacloban City
Storm Surge Hazard for North of Leyte (READY PROJECT)Source: http://www.geoportal.gov.ph/ (5:01 PM – 09-25-13)
Rain-Induced Landslide Hazard Map for North of Leyte (source: MGB)Source: http://www.geoportal.gov.ph/ (5:25 PM – 09-25-13)
SHALLOW LANDSLIDE SUSCEPTIBILITYSIMULATION
Shallow Landslide Susceptibility Map for North of Leyte
STRUCTURALLY-CONTROLLED LANSLIDE SIMULATIONColtop3D – 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
Potential Rockslide Zones of Tacloban City, Leyte
ALLUVIAL FAN AND DEBRIS FLOW SIMULATION
• 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.
Landslide Inventory Map for Leyte
Province
AbuyogAlangalang
AlbueraBontoc
DagamiHindang
HinunanganKanangaLibagon
LiloanMahaplag
MalitbogMatalom
MeridaOrmoc City
Padre BurgosSilagoSogod
St. BernardTacloban
Tomas Oppus
0 5 10 15 20 25
Number of Landslides per Municipality
Abuyog
Albuera
Dagami
Hinunangan
Libagon
Mahaplag
Matalom
Ormoc City
Silago
St. Bernard
Tomas Oppus
0 5 10 15 20 25 30
% Area Affected
Inventory of Landslides in Leyte
Landslide Statistics Map for Leyte
Province
SHALLOW LANDSLIDE SUSCEPTIBILITYSIMULATION
Shallow Landslide Susceptibility Map for North of Leyte
STRUCTURALLY-CONTROLLED LANSLIDE SIMULATIONColtop3D – 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
Potential Rockslide Zones of Tacloban City, Leyte
Portion of Leyte and Southern Leyte Potential Rockslide Zones
Saint Bernard, Hinunangan, Libangon and Liloan Potential Rockslide Zones
Guinsaugon Area Potential Rockslide Zones and Rock Mass Propagation Extent