Applicability of Geomorphic Information Entropy in the Post-Earthquake Debris Flow Risk Assessment
详细信息
- 责任者：Wang Jun (Key Laboratory of Mountain Surface Process and Hazards ; CAS ; Chengdu 610041 ; China) ; Ou Guoqiang
- 刊名：Journal of Mountain Research
- 出版年：2013
- 卷期：31(1)
- 页码：p.83-91
- 图表：11 illus., 2 tables, 16 refs.
- issnNo：ISSN1008-2786
- isbnNo：CN51-1516/P
摘要
Geomorphic information entropy can be used to express the erosive degree of the watershed geomorphic surfaces,which is one of the quantitative indicators to judge the evolution stage of landform development.Based on principles and calculation methods of geomorphic information entropy,this article used GIS technology,Matlab and SPSS softwares to calculate hypsometric integral value and geomorphic information entropy of the 41 sub-basins in the DuJiangyan Shenxi gully watershed,studied landform development characteristics of overall basin and each sub-basin,explored debris flow development situation of each sub-basin channel,and compared with the field survey after the earthquake.The results showed that in the DuJiangyan of Sichuan earthquake-hit areas,large numbers of loose solid materials induced by Earthquake accumulated in the channel,not only supplied materials for debris flows,but also made the channel local topography change sudden.Using the method of geomorphic information entropy could not express these sudden changes,so debris flow risk assessment in the earthquake-hit areas based on geomorphic information entropy had certain limitations.In order to make the debris flow risk assessment result in earthquake-hit areas results more real,reliable and credible,it must be combined with the actual situation of the basin to analyze and correct comprehensive,or demonstrate and analyze through the several methods of risk assessment.
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