Evaluation on Regional Degree of Risk about Debris Flow in worst-hit areas of the Wenchuan Earthquake Based on GIS
Based on feature of development of debris flow in disaster area after earthquake, seismic intensity, lithology of stratum, geological conformation, gradient of terrain and average maximal daily precipitation are selected as evaluation factor, weight of each factor is determined by AHP method, weighted average of factors is reckoned by overlay analysis function of GIS technique, and distribution map of degree of risk of county and district with debris flow repeatedly occurring in worst-hit area is obtained. The majority of debris flow ditches which broken out in rainy season of 2008 are located in area of high degree of risk, indicating that index system and method of evaluation offered in this paper are logical and feasible, the distribution map reflects distribution law of degree of risk of debris flow in disaster area after earthquake as a whole, and may be reference used for reconstruction after disaster in disaster area.
The Wenchuan Earthquake GIS Debris flow Regional Degree of Risk
Jinshan Zhang Shige Wang Hong Xie
Key Laboratory of Mountain Hazard and Surface Processes, CAS, Institute of mountain Hazards and Envi Key Laboratory of Mountain Hazard and Surface Processes, CAS, Institute of mountain Hazards and Envi
国际会议
哈尔滨
英文
469-475
2010-09-10（万方平台首次上网日期，不代表论文的发表时间）