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Title: Rapid appraisal of rainfall threshold and selected landslides in Baguio, Philippines
Contributor(s): Javier, Dymphna (author); Kumar, Lalit  (author)orcid ; Tengonciang, Arlene Mae P (author)
Publication Date: 2015
DOI: 10.1007/s11069-015-1790-y
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Abstract: Among the most landslide prone in the Philippines is the Baguio district, a center of trade, commerce, education and governance. It also has the highest recorded rainfall in the country. Rainfall-induced landslides (RILs) occur yearly and are triggered by rainfall due to southwest monsoon, tropical cyclones and their interactions; and orographic lifting by the Cordillera mountain range. Both natural and human factors contribute to the region's susceptibility to RIL. Fatalities can reach hundreds, and economic damages may reach billions of dollars per event. The rainfall and reported RIL occurrence were compiled for the period 2000-2013. The characteristics and impact of major RIL such as those instigated by Typhoon Parma in October 2009 are highlighted. Most landslides were associated with tropical cyclones, enhanced monsoon flow and 24-h rainfall that ranged from 73 to 1086 mm, corresponding to average rainfall rates of 3-45 mm per hour. The number of daily-reported landslide incidents ranged from 1 to 41. Slides, debris flows and earth flows were observed as the predominant types. As the observed landslide-triggering rainfall is below or within the range of the observed yearly maximum 24-h rainfall, which is 164-1086 mm, RIL will likely continue to occur annually and pose a major challenge for Baguio. The minimum of 70-mm daily rainfall may serve as a threshold for early landslide advisory. Given the limited number of landslides and analysis of landslide occurrence in relation to other controlling/predisposing factors undertaken, the threshold identified can only be regarded as indicative.
Publication Type: Journal Article
Source of Publication: Natural Hazards, 78(3), p. 1587-1607
Publisher: Springer
Place of Publication: Amsterdam, The Netherlands
ISSN: 0921-030X
Field of Research (FOR): 120505 Regional Analysis and Development
090903 Geospatial Information Systems
120504 Land Use and Environmental Planning
Socio-Economic Objective (SEO): 960909 Mountain and High Country Land and Water Management
960301 Climate Change Adaptation Measures
960911 Urban and Industrial Land Management
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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