Modeling the dynamics of geobiophysical factors and human activities as key influences in predicting rainfall-induced landslides in Infanta, Quezon, Philippines
2010
Abucay, E. R., Philippines Univ. Los Baños, College, Laguna (Philippines)
The municipality of Infanta, Quezon [Philippines] was devastated by numerous landslides and flooding caused by successive typhoons (Unding, Violenta, Winnis and super typhoon Yoyong) in 2004 which resulted to damages to properties, infrastructure, agriculture and loss of lives. This study was conducted to develop a landslide susceptibility model based on the inter-relationships between this geobiophysical factors (geotechnical soil properties slope, vegetation, land use), human activities (agricultural practices, charcoal making) and climate variability (rainfall amount) utilizing tools such as Geographic Information System (GIS) for the spatial analysis and dynamic systems modelling in STELLA. Results showed that barangay [village] Magsaysay (upland) was susceptible to landslide attributed to the geotechnical properties of the soil e.g. deep clay soil with low to moderate expansion potential (Psub1 = 16.53 - 33.04) and drastic change in land use in a span of six years (e.g 52.27% reduction in forest cover, 97% increase in areas planted to annual crops). The Simulated Landslide Susceptibility Index (LSI) values of the systems model further revealed that the geobiophysical characteristics of the area, impacts of human activities such as charcoal making coupled high rainfall intensity during susceptibilities (LEI 0.7) of the study area.
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