Comparative analysis of contributing parameters for rainfall-triggered landslides in the Lesser Himalaya of Nepal |
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| Authors: | Ranjan Kumar Dahal Shuichi Hasegawa Minoru Yamanaka Santosh Dhakal Netra Prakash Bhandary Ryuichi Yatabe |
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| Institution: | (1) Department of Safety Systems Construction Engineering, Faculty of Engineering, Kagawa University, 2217-20, Hayashi-cho, Takamatsu 761-0396, Japan;(2) Department of Geology, Tri-Chandra Multiple Campus, Tribhuvan University, Ghantaghar, Kathmandu, Nepal;(3) Department of Mines and Geology, Lainchaur, Kathmandu, Nepal;(4) Department of Civil and Environmental Engineering, Ehime University, Bunkyo-3, 790-8577 Matsuyama, Japan |
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| Abstract: | In the Himalaya, people live in widely spread settlements and suffer more from landslides than from any other type of natural
disaster. The intense summer monsoons are the main factor in triggering landslides. However, the relations between landslides
and slope hydrology have not been a focal topic in Himalayan landslide research. This paper deals with the contributing parameters
for the rainfall-triggered landslides which occurred during an extreme monsoon rainfall event on 23 July 2002, in the south-western
hills of Kathmandu valley, in the Lesser Himalaya, Nepal. Parameters such as bedrock geology, geomorphology, geotechnical
properties of soil, and clay mineralogy are described in this paper. Landslide modeling was performed in SEEP/W and SLOPE/W
to understand the relationship of pore water pressure variations in soil layers and to determine the spatial variation of
landslide occurrence. Soil characteristics, low angle of internal friction of fines in soil, medium range of soil permeability,
presence of clay minerals in soil, bedrock hydrogeology, and human intervention were found to be the main contributing parameters
for slope failures in the region. |
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| Keywords: | Rainfall-triggered landslides Himalaya Clay minerals Seepage analysis Stability analysis |
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