Abstract Book of The Second World Landslide Forum : Monitoring of rainfall induced landslides at Ulu Klang Malaysia
Muhammad Muklisin (1) , Alfi Rahmi (2) , Sri Atmaja P. Rosyidi (3) , and Mohd. Raihan Taha (4)
(1) Senior Lecturer, Universiti Kebangsaan Malaysia, Civil And Structural Engineering, Bangi, Malaysia; (2) Alumni, Universiti Kebangsaan Malaysia, Civil And Structural Engineering, Bangi, Malaysia; (3) Assistant Professor, Universitas Muhammadiyah Yogyakarta, Civil Engineering, Yogyakarta, Indonesia (Corresponding Author: email@example.com); (4) Professor, Universiti Kebangsaan Malaysia, Civil And Structural Engineering, Bangi, Malaysia;
Ulu Klang is among the most risky areas in Malaysia which is in front with rapid landslide occurrences particularly at the hillside areas. Due to it is an urban area with highly density of population, the impacts of these tragedies is unfavorable to human life, building, public and utilization facilities. The causes of landslides in slopes are attributed to a number of factors. However, in case of Malaysia with tropical season, from the previous studies, the main factor on slopes failure and landslides at numbers site in Malaysia are predominantly caused by storm water activities and rainfall. Lack of storm water planning and design are identified as the one of important causes inducing the landslides, e.g., Taman Zoo View, Kampung Pasir landslide events. Moreover, rainfall is known to be one of the most significant triggering factors for landslides. In recent years, the increase in the frequency and intensity of rainfall events has also brought significant landslide disasters in Malaysia. From 1993 to 2008, there were 13 major landslides (both in cuttings and natural slopes) reported near to or within densely populated cities in Malaysia. These landslides resulted in nearly 100 fatalities. The rainfall infiltration could result in changing the suction and the moisture of soil, raising the unit weight of soil, and reducing the shear strength of soil. Therefore, to assess the potential susceptibility to landslide, a monitoring of rainfall-induced landslide is essential stage of landslide investigation in Malaysia. The aim of this study is to observe the effect of rainfall induced the landslides at the Ulu Klang area. The rainfall data used in the analysis was collected from the two rain gauge stations of JPS Ampang and Empangan Genting Klang which both are located in the study area. The rainfall parameters observed were the maximum rainfall intensity, duration and antecedent rainfall for the landslide events during the period of 1993 to 2008. In this study the effect of antecedent rainfall induced slope instability was analyzed for the 13 landslide events. The results showed that the antecedent rainfall predominantly contributed to the landslide at Ulu Klang. However, in some landslide events, other causes, i.e., deforestation due to development activities in hillside areas, un-engineered walls and man-made slopes, are to be found as a main reason of landslide occurrences instead of rainfall intensity. Keyword: rainfall induced landslide, antecedent rainfall, monitoring, rainfall intensity.
The Second World Landslide Forum Abstracts WLF2 – 2011– 0727 Rome, 2011, Abstract Book of the Second World Landslide Forum, 3-9 October 2011, Rome, ISPRA – Istituto Superiore per la Protezione e la Ricerca Ambientale (Italian National Institute for Environmental Protection and Research) Via Vitaliano Brancati, 48 – 00144 Rome, Italy www.isprambiente.gov.it. ISBN 978-88-448-0515-9.
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