DOI: 10.1007/s11069-020-03867-3
论文题名: GIS-based assessment of debris flow hazards in Kulekhani Watershed, Nepal
作者: Paudel B. ; Fall M. ; Daneshfar B.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2020
卷: 101, 期: 1 起始页码: 143
结束页码: 172
语种: 英语
中文关键词: Debris flow
; Hazard assessment
; Himalaya
; Landslides
; Rainfall
英文关键词: debris flow
; extreme event
; frequency analysis
; hazard assessment
; landslide
; precipitation intensity
; slope stability
; Himalayas
; Nepal
英文摘要: Debris flows are a hazardous natural calamity in mountainous regions of Nepal. Torrential rainfall within a very short period of the year is the main triggering factor for instability of slopes and initiation of landslides in these regions. Furthermore, the topography of the mountains and poor land use practices are additional factors that contribute to these instabilities. In this research, a GIS model has been developed to assess the debris flow hazard in mountainous regions of Nepal. Landslide-triggering threshold rainfall frequency is related to the frequency of landslides and the debris flow hazard in these mountains. Rainfall records from 1980 to 2013 are computed for one- to seven-day cumulative annual maximum rainfall. The expected rainfall for 1 in 10 to 1 in 1000 years of return periods is analyzed. The expected threshold rainfall is modeled in the GIS environment to identify the factor of safety of mountain slopes in a study watershed. A relation between the frequency of rainfall and debris flow hazard area is derived for return periods of 25, 50, 100, and 200 years. The debris flow hazard results from the analysis are compared with a known event in the watershed and found to agree. This method can be applied to anticipated rainfall-induced debris flow from the live rainfall record to warn the hazard-prone community in these mountains. © 2020, Springer Nature B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/168669
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Department of Civil Engineering, University of Ottawa, 161 Colonel By, Ottawa, ON K1N 6N5, Canada; Agriculture and Agri-Food Canada, 960, Carling Avenue, Ottawa, ON K1A 0C6, Canada
Recommended Citation:
Paudel B.,Fall M.,Daneshfar B.. GIS-based assessment of debris flow hazards in Kulekhani Watershed, Nepal[J]. Natural Hazards,2020-01-01,101(1)