GIS Modelling of Karstification Potential of Samal Island, Davao Del Norte
DOI:
https://doi.org/10.64612/ijiv.v1i5.44Keywords:
AHP, Geohazard, Karstification Potential,Abstract
In the Philippines, Samal Island is a karst environment that has undergone significant changes due to human activity over the last few years. At this rate of growth, it may be challenging to recognize that karstification is still being caused by natural processes, which may not be fully evident on current karst sinking risk maps. The goal of this study is to determine the different levels of karstification (or karstification potential) on the island by categorizing areas into high, moderate, and low karstification using a GIS-based analysis guided by the Analytical Hierarchy Process (AHP). To make a new geologic map, detailed geologic mapping was done. Other related datasets were rasterized, reclassified, and weighted using a pairwise comparison matrix. The central part of Samal Island exhibits a high level of karstification, as confirmed by accuracy tests and an inventory of caves, sinkholes, and other karst features. On the other hand, there is moderate karstification in the edges of coastal places, especially where sedimentary rocks with limestone are present. The study revealed that rock and rainfall are the primary factors that cause karstification. After creating a map that identifies areas that may become karst, local governments can utilize it as a guide when developing long-term land use plans and mitigating risks on Samal Island.
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