DOI: 10.1002/2015GL063784
论文题名: Prediction of flash flood hazard impact from Himalayan river profiles
作者: Devrani R. ; Singh V. ; Mudd S.M. ; Sinclair H.D.
刊名: Geophysical Research Letters
ISSN: 0094-9193
EISSN: 1944-8924
出版年: 2015
卷: 42, 期: 14 起始页码: 5888
结束页码: 5894
语种: 英语
英文关键词: flash flood
; Himalaya
; river profile
Scopus关键词: Erosion
; Forecasting
; Hazards
; Rivers
; Sediments
; Extreme flood events
; Flash flood
; Hazard prediction
; Himalayan rivers
; Himalayas
; Long term records
; River profile
; Sediment accumulation
; Floods
; extreme event
; flash flood
; geomorphology
; glacial lake
; hazard assessment
; mountain region
; river system
; Ganges Basin
; India
; Uttarakhand
英文摘要: To what extent can we treat topographic metrics such as river long profiles as a long-term record of multiple extreme geomorphic events and hence use them for hazard prediction? We demonstrate that in an area of rapid mountain erosion where the landscape is highly reactive to extreme events, channel steepness measured by integrating area over upstream distance (chi analysis) can be used as an indicator of geomorphic change during flash floods. We compare normalized channel steepness to the impact of devastating floods in the upper Ganga Basin in Uttarakhand, northern India, in June 2013. The pattern of sediment accumulation and erosion is broadly predictable from the distribution of normalized channel steepness; in reaches of high steepness, channel lowering up to 5m undercut buildings causing collapse; in low steepness reaches, channels aggraded up to 30m and widened causing flooding and burial by sediment. Normalized channel steepness provides a first-order prediction of the signal of geomorphic change during extreme flood events. Sediment aggradation in lower gradient reaches is a predictable characteristic of floods with a proportion of discharge fed by point sources such as glacial lakes. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938984405&doi=10.1002%2f2015GL063784&partnerID=40&md5=a1ec1c420967c828837f4f725afb57cb
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8809
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Geology, University of Delhi, New Delhi, India
Recommended Citation:
Devrani R.,Singh V.,Mudd S.M.,et al. Prediction of flash flood hazard impact from Himalayan river profiles[J]. Geophysical Research Letters,2015-01-01,42(14).