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| Titel |
Probabilistic storm surge inundation maps for Metro Manila based on Philippine public storm warning signals |
| VerfasserIn |
J. Tablazon, C. V. Caro, A. M. F. Lagmay, J. B. L. Briones, L. Dasallas, J. P. Lapidez, J. Santiago, J. K. Suarez, C. Ladiero, L. A. Gonzalo, M. T. F. Mungcal, V. Malano |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 3 ; Nr. 15, no. 3 (2015-03-12), S.557-570 |
| Datensatznummer |
250119371
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| Publikation (Nr.) |
 copernicus.org/nhess-15-557-2015.pdf |
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| Zusammenfassung |
| A storm surge is the sudden rise of sea water over the astronomical tides, generated by an approaching
storm. This event poses a major
threat to the Philippine coastal areas, as manifested by Typhoon Haiyan on 8 November 2013.
This hydro-meteorological hazard is one of the main reasons
for the high number of casualties due to the typhoon, with 6300 deaths. It
became evident that the need to develop a storm surge inundation map is of
utmost importance. To develop these maps, the Nationwide Operational
Assessment of Hazards under the Department of Science and Technology (DOST-Project NOAH)
simulated historical tropical cyclones that entered the
Philippine Area of Responsibility. The Japan Meteorological Agency
storm surge model was used to simulate storm surge heights. The frequency
distribution of the maximum storm surge heights was calculated using
simulation results of tropical cyclones under a specific public storm warning
signal (PSWS) that passed through a particular coastal area. This determines
the storm surge height corresponding to a given probability of occurrence.
The storm surge heights from the model were added to the maximum astronomical
tide data from WXTide software. The team then created maps of inundation for
a specific PSWS using the probability of exceedance derived from the
frequency distribution. Buildings and other structures were assigned a
probability of exceedance depending on their occupancy category, i.e., 1%
probability of exceedance for critical facilities, 10% probability of
exceedance for special occupancy structures, and 25% for standard occupancy
and miscellaneous structures. The maps produced show the storm-surge-vulnerable areas in Metro Manila, illustrated by the flood depth of up
to 4 m and extent of up to 6.5 km from the coastline. This
information can help local government units in developing early
warning systems, disaster preparedness and mitigation plans, vulnerability
assessments, risk-sensitive land use plans, shoreline defense efforts, and
coastal protection measures. These maps can also determine the best areas to
build critical structures, or at least determine the level of protection of these
structures should they be built in hazard areas. Moreover, these will support
the local government units' mandate to raise public awareness, disseminate
information about storm surge hazards, and implement appropriate
countermeasures for a given PSWS. |
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