Empirically based rainfall threshold for landslides occurrence in peninsular Malaysia

Abu Mansor Maturidi, Abdul Muaz and Kasim, Norhidayu and Abu Taib, Kamarudin and Wan Azahar, Wan Nur Aifa and Ahmad Tajuddin, Husna (2021) Empirically based rainfall threshold for landslides occurrence in peninsular Malaysia. KSCE Journal of Civil Engineering. pp. 1-15. ISSN 1226-7988 E-ISSN 1976-3808

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Abstract

Empirical rainfall thresholds for the purpose of shallow landslide forecasting are proposed for Peninsular Malaysia where numerous slope failures are reported due to the intense rainfall in conjunction with the humid tropical climate. Thirty-seven cases of landslide-triggering-rainfall were selected from 1993 to 2018 to identify the correlation between rainfall and shallow landslide through the analysis of specific rainfall events. The derived rainfall parameters were applied to establish two rainfall thresholds of (Imean-D) and (Imax-D) via practical methods. For the identical range of event duration 1 < D < 263 h, the (Imean-D) threshold formula was expressed as I = 17.5 D−0.722, while the (Imax-D) threshold was defined as I = 37.8 D−0.114. Both thresholds performed different functionalities with a primary goal of predicting shallow landslides. When both (Imean-D) and (Imax-D) thresholds were compared with the thresholds proposed by various studies worldwide, both dominated the upper positions. More rainfall is required for land sliding due to the high thickness of the Malaysian soil that is associated with the abundant tropical downpour. From the perspective of the antecedent, the period of prolonged precipitation or short heavy rainfall from 1 to 10 days can result in shallow landslides for Peninsular Malaysia. In the context of geology, the igneous rock type of granite has the highest susceptibility to the shallow landslide at 65%, despite other rock types of sedimentary and metamorphic. The threshold validation depicted all True Positive events for the (Imax-D) threshold, and one Negative False event for the (Imean-D) threshold. The (Imean-D) threshold was revised to acquire the new value, but it needed to deal with the possibility of False Alarm and the (Imax-D) threshold seemed to be more credible to represent the rainfall�induced shallow landslide threshold for Peninsular Malaysia.

Item Type:	Article (Journal)
Additional Information:	8812/92141
Uncontrolled Keywords:	Landslide Rainfall intensity-duration threshold Rainfall threshold Early warning system Peninsular Malaysia Empirical correlation
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA170 Environmental engineering. Sustainable engineering T Technology > TA Engineering (General). Civil engineering (General) > TA495 Disasters and engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Civil Engineering Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User:	Ir.Ts.Dr. Norhidayu Kasim
Date Deposited:	10 Sep 2021 12:16
Last Modified:	10 Sep 2021 12:16
URI:	http://irep.iium.edu.my/id/eprint/92141

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