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DOI:
工程科学与技术:2009,41(3):131-139
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“5·12”地震后都汶公路沿线泥石流沟危险性评价
(中国科学院 山地灾害与地表过程重点实验室,四川 成都 610041)
Hazard Assessment of Debris Flow Valleys Along Dujiangyan-Wenchuan Highway After “5·12” Wenchuan Devastating Earthquake
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中文摘要: 都汶公路地处“5·12”汶川大地震的极震区,地震造成大量的崩塌、滑坡、泥石流等次生山地灾害。沿线大多数沟谷都具备暴发泥石流的条件,震后10~20 a将处于泥石流活跃期,尤其前5年泥石流异常活跃。通过野外考察和高分辨率遥感影像数据,获得研究区泥石流沟的基础数据,对比分析建立了震后泥石流总量计算方程,并以泥石流总量和沟床比降作为参数,建立了单沟泥石流危险性评价模型,进行泥石流沟危险性评价。对研究区29条泥石流沟的评价表明:泥石流沟大部分处于中度危险以上,中度危险、高度危险与极高度危险的沟谷占79.31%,其中极高度危险区占20.7%。危险性最大的沟谷为郭竹铺沟、马埝坪沟、野牛沟、一碗水沟和高店子沟,其次是新桥沟、千斤沟、粉丹沟和茨里沟。灾后重建应倍加重视,做好泥石流的预测、预报及防治。
Abstract:“5·12” Wenchun Earthquake resulted in large numbers of geo hazards along Dujiangyan Wenchuan Highway located in the zone of extreme quake areas. After this earthquake, most of valleys have favorable conditions for debris flow occurrence and are very active in the future 10~20 years, especially the beginning 5years after this earthquake. This paper mainly discussed and assessed the hazard levels of debris flow valleys based on the data of field investigation and high resolution remote sense image identification. The hazard assessment model for single debris flow valley was established using valley slope gradient and debris flow magnitude,and 29 debris flow valleys were assessed by this model and classified into 4 hazard levels of extreme hazard, high hazard, middle hazard and gentle hazard. The assessment result showed that most of debris flow valleys were in and over middle hazard level, occupied 79.31% and the valleys of extreme hazard level accounted for 20.7%. The most hazard valleys were Guozhupu valley, Manianping valley, Yeniu valley, Yiwanshui valley and Gaodianzi valley, and then were Xinqiao valley, Qinjin valley, Fendan valley and Cili valley. These valleys should be pay specific attention and make effective measures to predict, evade and prevent debris flow in the earthquake reconstruction projects.
文章编号:20090318     中图分类号:    文献标志码:
基金项目:国家973计划资助项目(2008CB425802);西部交通建设科技项目(200831822196)
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庄建琦,崔鹏,葛永刚.“5·12”地震后都汶公路沿线泥石流沟危险性评价[J].工程科学与技术,2009,41(3):131-139.
.Hazard Assessment of Debris Flow Valleys Along Dujiangyan-Wenchuan Highway After “5·12” Wenchuan Devastating Earthquake[J].Advanced Engineering Sciences,2009,41(3):131-139.