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Zhang Jianqiang1; Liu Rongkun2; Deng Wei1; Khanal Narendra Raj3; Gurung Deo Raj2; Murthy Manchiraju Sri Ramachandra2; Wahid Shahriar2
Source Publicationjournalofmountainscience
AbstractKoshi River basin, which lies in the Central Himalayas with an area of 71,500 km~2, is an important trans-boundary river basin shared by China, Nepal and India. Yet, landslide-prone areas are all located in China and Nepal, imposing alarming risks of widespread damages to property and loss of human life in both countries. Against this backdrop, this research, by utilizing remote sensing images and topographic maps, has identified a total number of 6877 landslides for the past 23 years and further examined their distribution, characteristics and causes. Analysis shows that the two-step topography in the Himalayan region has a considerable effect on the distribution of landslides in this area. Dense distribution of landslides falls into two regions: the Lesser Himalaya(mostly small and medium size landslides in east-west direction) and the TransitionBelt(mostly large and medium size landslides along the river in north-south direction). Landslides decrease against the elevation while the southern slopes of the Himalayas have more landslides than its northern side. Change analysis was carried out by comparing landslide distribution data of 1992, 2010 and 2015 in the Koshi River basin. The rainfallinduced landslides, usually small and shallow and occurring more frequently in regions with an elevation lower than 1000 m, are common in the south and south-east slopes due to heavy precipitation in the region, and are more prone to the slope gradient of 20°~30°. Most of them are distributed in Proterozoic stratum(Pt_(3ε), Pt_3 and Pt_(2-3)) and Quaternary stratum. While for earthquake-induced landslides, they are more prone to higher elevations(2000~3000 m) and steeper slopes(40°~50°).
Document Type期刊论文
2.International Centre for Integrated Mountain Development
3.Central Department of Geography, Tribhuvan University
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Zhang Jianqiang,Liu Rongkun,Deng Wei,et al. characteristicsoflandslideinkoshiriverbasincentralhimalaya[J]. journalofmountainscience,2016,13(10):1711.
APA Zhang Jianqiang.,Liu Rongkun.,Deng Wei.,Khanal Narendra Raj.,Gurung Deo Raj.,...&Wahid Shahriar.(2016).characteristicsoflandslideinkoshiriverbasincentralhimalaya.journalofmountainscience,13(10),1711.
MLA Zhang Jianqiang,et al."characteristicsoflandslideinkoshiriverbasincentralhimalaya".journalofmountainscience 13.10(2016):1711.
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