Rainfall threshold calculation for debris flow early warning in areas with scarcity of data

doi:10.5194/nhess-18-1395-2018

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	Rainfall threshold calculation for debris flow early warning in areas with scarcity of data
	Pan, Hua-Li1,2 ; Jiang, Yuan-Jun1,2 ; Wang, Jun3 ; Ou, Guo-Qiang1,2
刊名	NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
	2018-05-17
卷号	18 期号:5 页码:1395-1409
ISSN号	1561-8633
DOI	10.5194/nhess-18-1395-2018
英文摘要	Debris flows are natural disasters that frequently occur in mountainous areas, usually accompanied by serious loss of lives and properties. One of the most commonly used approaches to mitigate the risk associated with debris flows is the implementation of early warning systems based on well-calibrated rainfall thresholds. However, many mountainous areas have little data regarding rainfall and hazards, especially in debris-flow-forming regions. Therefore, the traditional statistical analysis method that determines the empirical relationship between rainstorms and debris flow events cannot be effectively used to calculate reliable rainfall thresholds in these areas. After the severe Wenchuan earthquake, there were plenty of deposits deposited in the gullies, which resulted in several debris flow events. The triggering rainfall threshold has decreased obviously. To get a reliable and accurate rainfall threshold and improve the accuracy of debris flow early warning, this paper developed a quantitative method, which is suitable for debris flow triggering mechanisms in meizoseismal areas, to identify rainfall threshold for debris flow early warning in areas with a scarcity of data based on the initiation mechanism of hydraulic-driven debris flow. First, we studied the characteristics of the study area, including meteorology, hydrology, topography and physical characteristics of the loose solid materials. Then, the rainfall threshold was calculated by the initiation mechanism of the hydraulic debris flow. The comparison with other models and with alternate configurations demonstrates that the proposed rainfall threshold curve is a function of the antecedent precipitation index (API) and 1 h rainfall. To test the proposed method, we selected the Guojuanyan gully, a typical debris flow valley that during the 2008-2013 period experienced several debris flow events, located in the meizoseismal areas of the Wenchuan earthquake, as a case study. The comparison with other threshold models and configurations shows that the selected approach is the most promising starting point for further studies on debris flow early warning systems in areas with a scarcity of data.
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000432457400003
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/23014]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者	Jiang, Yuan-Jun
作者单位	1.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Sichuan, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China 3.Guangzhou Inst Geog, Guangzhou 510070, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Pan, Hua-Li,Jiang, Yuan-Jun,Wang, Jun,et al. Rainfall threshold calculation for debris flow early warning in areas with scarcity of data[J]. NATURAL HAZARDS AND EARTH SYSTEM SCIENCES,2018,18(5):1395-1409.
APA	Pan, Hua-Li,Jiang, Yuan-Jun,Wang, Jun,&Ou, Guo-Qiang.(2018).Rainfall threshold calculation for debris flow early warning in areas with scarcity of data.NATURAL HAZARDS AND EARTH SYSTEM SCIENCES,18(5),1395-1409.
MLA	Pan, Hua-Li,et al."Rainfall threshold calculation for debris flow early warning in areas with scarcity of data".NATURAL HAZARDS AND EARTH SYSTEM SCIENCES 18.5(2018):1395-1409.