Debris flow disaster risk assessment based on extension AHP
Author(s): LIU Jin-peng, GAO Shi-ming, WANG De-kai, LAN Yong-chao, Gansu Academy of Sciences, Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences
Pages: 531-538
Year: 2015 Issue: 3
Journal: Arid Land Geography
Keyword: extension AHP; risk assessment; debris flow disaster;
Abstract: The paper aimed to solve the problem that the judgment has to be confined to consider only two extremes when the traditional evaluation scheme is adopted toward the importance of assignment,and mainly focused on the 13 debris flow gullies in Tianzhu,Tibetan Autonomous County in Gansu Province,China,in which the Extension Set Theory and its methods were applied to evaluate multiple regional(basin)debris flow gullies.A new approach was thereby provided in the study to comprehensive evaluation and ranking of multiple regional(basin)debris flow gullies,and also to the control and prevention of regional debris flow disasters. Based on such methods,the results revealed as follows:(1)one debris flow gully among the 13 is at moderate hazard level and the other 12 at slight hazard level,and they are generally in alignment with results of other studies,which proved the validity of the current approach in the comprehensive evaluation and ranking of multiple regional(basin)debris flow gullies;(2)this paper integrated the Extension Analytic Hierarchy Process(EAHP)with the approach of judging matrix weighting vector to meet the requirement of the solution consistency to overcome the defect in the consistency of the judgment matrix when only the fuzzy Analytic Hierarchy Process(AHP)methods were used in previous debris flows hazard assessment studies,making countermeasures more in accordance with actual geological conditions in China.(3)the results further demonstrated that,choices of index are essential in the hazard evaluation of debris flow gullies and should be done according to actual circumstances of different regions. Although there still exists difficulties in choosing evaluation index,some index(such as precipitation,underlying surface and regional geology)have relatively consistent effects on the same region. Therefore,the approach adopted in the current study has refrained excessive index from getting involved,which simplified the whole evaluation process.
Pages: 531-538
Year: 2015 Issue: 3
Journal: Arid Land Geography
Keyword: extension AHP; risk assessment; debris flow disaster;
Abstract: The paper aimed to solve the problem that the judgment has to be confined to consider only two extremes when the traditional evaluation scheme is adopted toward the importance of assignment,and mainly focused on the 13 debris flow gullies in Tianzhu,Tibetan Autonomous County in Gansu Province,China,in which the Extension Set Theory and its methods were applied to evaluate multiple regional(basin)debris flow gullies.A new approach was thereby provided in the study to comprehensive evaluation and ranking of multiple regional(basin)debris flow gullies,and also to the control and prevention of regional debris flow disasters. Based on such methods,the results revealed as follows:(1)one debris flow gully among the 13 is at moderate hazard level and the other 12 at slight hazard level,and they are generally in alignment with results of other studies,which proved the validity of the current approach in the comprehensive evaluation and ranking of multiple regional(basin)debris flow gullies;(2)this paper integrated the Extension Analytic Hierarchy Process(EAHP)with the approach of judging matrix weighting vector to meet the requirement of the solution consistency to overcome the defect in the consistency of the judgment matrix when only the fuzzy Analytic Hierarchy Process(AHP)methods were used in previous debris flows hazard assessment studies,making countermeasures more in accordance with actual geological conditions in China.(3)the results further demonstrated that,choices of index are essential in the hazard evaluation of debris flow gullies and should be done according to actual circumstances of different regions. Although there still exists difficulties in choosing evaluation index,some index(such as precipitation,underlying surface and regional geology)have relatively consistent effects on the same region. Therefore,the approach adopted in the current study has refrained excessive index from getting involved,which simplified the whole evaluation process.
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