RAINFALL EFFECT ON SLOPE STABILITY USING (SINMAP) FOR LANDSLIDES SUSCEPTIBILITY MAPPING AT BALIK PULAU, PULAU PINANG, MALAYSIA.

PROCEEDING JOINT CONVENTION BALI 2007
The 32nd HAGI and The 36th IAGI Annual Convention and Exhibition

RAINFALL EFFECT ON SLOPE STABILITY USING (SINMAP) FOR
LANDSLIDES SUSCEPTIBILITY MAPPING AT BALIK PULAU, PULAU
PINANG, MALAYSIA.

Adnan, M.S1, Abustan, I1, M. Ismail, M.A2, Hendrayana. H2.
1Civil Engineering Program, University Science Malaysia, Penang
2Geology Engineering, Gadjah Mada University, Yogyakarta

ABSTRACT

The purpose of this paper is to produce the susceptibility map of Balik Pulau area in order to access the potential and/or prone area to landslide. Has been located in the western part of Pulau Pinang, is an area prone with tourism development and activities. The importance of this area is however jeopardized by previous record of landslide events. As Balik Pulau holds the most important asset, i.e. water resources sources for the whole island, losses due to landslide incidents resulted in a rising demand of landslide mitigation works to be carried out. The ability to map landslide hazard area is crucial in the decision making process of landslide mitigation. The method used in the research involves the integration of Geographic Information System (GIS) technology namely SINMAP (Stability INdex MAPping).
SINMAP is an ArcView extension that implements the computation and mapping of a slope stability index based upon geographic information, primarily digital elevation data to identify the exact location marked as unstable area. The study found that most of the areas with hill slope steeper than 30o are unstable, and contains weathering profiles of granite. Weathering profiles of granite are prone to numerous landslides by rainstorms and very preferable to result in shallow landslide. The findings indicated the usefulness of the method utilized and therefore it can be implemented for regional landslide mitigation works. Nevertheless, future modification, improvement, and updating of this work are highly suggested in order to accommodate new changes either in natural or man-made process.