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| Hazard assessment of debris flow in severely-afflicted area by Wenchuan Earthquake: A case study along DujiangyanWenchuan Highway |
| Han Yongshun1, Li Longwei1, Zhu Yingyan2, Kong Yaping3, Li Zhiqiang3, Huang Peng1 |
| 1.School of Architecture and Urban Planning, Hunan University of Science and Technology, 411201, Xiangtan, Hunan；2.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, 610041, Chengdu；3.Research Center for Environmental Protection and Safety of Transportation, China Academy of Transportation Sciences, 100029, Beijing：China |
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Abstract Hazard assessment of debris flows along highway is an important technological foundation for preventing & mitigating traffic geo-hazards and for reconstructing & planning destroyed traffic infrastructure by earthquake. In this paper, 28 debris flow gullies along DujiangyanWenchuan Highway (abbreviated to DuWen Highway) were taken as research objects. Corresponding geographical information and thematic hazards data were collected, and they were processed and analyzed through remote sensing, GIS technology. Assessment factors were selected and respective weights were determined by means of grey correlation analysis method. Meanwhile, a hazard assessment model of debris flow was established and applied to assess the hazard of 28 debris flow gullies along DuWen Highway. The findings show that: a) most of 28 debris flow gullies belong to high & severely high risk zones with 15 high risk gullies and 7 severely high risk gullies, that is,78.57% of total gullies; b)The highest risk gullies are Ergou, Niujuangou & Mozigou , next came Gaodianzigou, Manianpingou & Yiwanshuigou gullies; c) The multi-factor assessment method based on gray-correlation can fairly well select assessment factors, determine corresponding weights and calculate the value of hazard degree of each debris flow gully. The results can provide basis & reference for preventing & mitigating debris flows, reconstructing & planning stricken areas and selecting & designing traffic lines.
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Received: 12 September 2011
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