A method for assessing regional debris flow risk: an application in Zhaotong of Yunnan province (SW China)

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 > 成都山地所知识仓储（2009年以前）

	A method for assessing regional debris flow risk: an application in Zhaotong of Yunnan province (SW China)
	Xilin Liu（刘希林） ; Junzhong Lei
刊名	Geomorphology
	2003
卷号	52 期号:3-4 页码:181-191
关键词	Debris flows
合作状况	国内
英文摘要	Based on the definitions of the United Nations, the assessment of risk involves the evaluation of both hazard and vulnerability. This forms the basis of a generalized assessment model of debris flow risk. Hazard is a measure of the threatening degree of an extreme event and is expressed theoretically as a function of event magnitude and frequency of occurrence. Mathematically, it is the definite integral area under the magnitude–frequency curve. Based on the need for a model applicable in regions that lack data, a new method that incorporates theoretical concepts with empirical analysis is presented to calculate the regional hazardousness of debris flows. Debris flow hazard can be estimated from gully density, mean annual rainfall and percentage of cultivated land on steep slope. Vulnerability is defined as the potential total maximum losses due to a potential damaging phenomenon for a specified area and during a reference period. On a regional scale, it is dependent on the fixed assets, gross domestic product, land resources and population density, as well as age, education and wealth of the inhabitants. A nonlinear, power-function model to compute the vulnerability degree is presented. An application of the proposed method to Zhaotong prefecture of Yunnan province, SW China, provides high accuracy and reasonable risk estimates. The highest risk of debris flow is in Zhaotong county with a value of 0.48; the lowest risk of debris flow is in Yanjin county with a value of 0.16. The other counties have debris flow risks ranging from 0.22 to 0.46. This provides an approach for assessing the regional debris flow risk and a basis for the formulation of a regional risk management policy in Zhaotong prefecture.
收录类别	SCI
语种	英语
公开日期	2010-12-01
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/2674]
专题	成都山地灾害与环境研究所_成都山地所知识仓储（2009年以前）
推荐引用方式 GB/T 7714	Xilin Liu,Junzhong Lei. A method for assessing regional debris flow risk: an application in Zhaotong of Yunnan province (SW China)[J]. Geomorphology,2003,52(3-4):181-191.
APA	Xilin Liu,&Junzhong Lei.(2003).A method for assessing regional debris flow risk: an application in Zhaotong of Yunnan province (SW China).Geomorphology,52(3-4),181-191.
MLA	Xilin Liu,et al."A method for assessing regional debris flow risk: an application in Zhaotong of Yunnan province (SW China)".Geomorphology 52.3-4(2003):181-191.