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Regional modeling of rainfall-induced landslides using TRIGRS model by incorporating plant cover effects: case study in Hulu Kelang, Malaysia

Saadatkhah, N. and Mansor, S. and Kassim, A. and Lee, L. M. and Saadatkhah, R. and Sobhanmanesh, A. (2016) Regional modeling of rainfall-induced landslides using TRIGRS model by incorporating plant cover effects: case study in Hulu Kelang, Malaysia. Environmental Earth Sciences, 75 (5). ISSN 1866-6280

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Abstract

The objective of this paper is to develop a spatial temporal regional modeling of local rainfall patterns effect on the plant cover slopes in Hulu Kelang area. Rainfall interception, tree root cohesion, and tree surcharge were considered as main plant cover effects on the slope stability. In this regard, an improved version of the Transient Rainfall Infiltration and Grid-based Regional Slope stability model (TRIGRS) was performed using Microsoft Excel® and GIS framework system for coupled hydrological–mechanical modeling of rainfall-induced landslide by incorporating plant cover effects. The infiltration process of the improved model was integrated with the precipitation distribution method and rainfall interception approach while the slope stability analysis of TRIGRS model was replaced with the improved analysis with consideration of root cohesion and tree surcharge. In the following, the spatial temporal analysis of slope failures was performed using the monthly average rainfall during two different monsoon seasons of 2008 and 2009 for triggering shallow slope failure in Hulu Kelang area. The corresponding changes in pressure head and consequent water table depth were calculated during two monsoon seasons. Subsequently, factor of safety is computed using local rainfall patterns, along with root coefficient and tree surcharge in the study area. The results showed the plant-covered slopes are inducing an overestimation of the slope failure susceptibility using existing TRIGRS model, while the improved model resulted that less landslide susceptible areas were more representative of the actual stability conditions of the slopes at the study area.

Item Type:Article
Uncontrolled Keywords:Adhesion, Atmospheric thermodynamics, Forestry, Groundwater, Landslides, Precipitation (meteorology), Rain, Safety factor, Slope protection, Stability, Rainfall induced landslides, Rainfall interception, Root cohesion, Tree surcharge, TRIGRS, Slope stability, cohesion, hydrological modeling, infiltration, interception, landslide, rainfall, root, slope failure, slope stability, stability analysis, temporal analysis, tree, vegetation cover, Malaysia, Selangor, Ulu Klang, West Malaysia
Subjects:G Geography. Anthropology. Recreation > G Geography (General)
G Geography. Anthropology. Recreation > G Geography (General) > G70.212-70.215 Geographic information system
Divisions:Geoinformation and Real Estate
ID Code:73829
Deposited By: Haliza Zainal
Deposited On:18 Nov 2017 16:00
Last Modified:18 Nov 2017 16:00

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