Variability and rainfall against slope failure for Penang island
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Date
2017-06
Authors
Maimunah Binti Abu Kassim
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Abstract
Rainfall is one of the factors that can cause slope instability problems in
Malaysia especially Penang Island is one of the areas which have corrugated and hilly
topography. Thus, this study had been done throughout the two locations in Penang
Island and they are Air Itam and Batu Lanchang with the helps by one of the IDRISI
Selva software. The objectives of this study are first to identify variability of climate
change parameter, second to analyse using suitable model for landslide analysis and
lastly to provide landslide susceptibility maps based on the rainfall distribution. This
Yearly and monsoonal variations of long term rainfall (30 years) and (17 years) data
were studied. From time series plot and for mean yearly variations, both Air Itam and
Batu Lanchang provides positive trend. For mean monsoonal variations for Northeast
monsoon and Southwest monsoon, both Air Itam and Batu Lanchang provide positive
trends. The climate extreme indices analysis shows that climate change makes this
region become wetter with high amount of rainfall in Northeast monsoon and
Southwest monsoon. Overall, parameters used in landslide mapping of Air Itam and
Batu Lanchang are elevation, land use, soil properties and rainfall intensity with the
application of IDRISI Selva to identify risky areas that prone to landslide.