摘要
泥石流灾害是对我国西南山区城镇威胁最为严重的地质灾害之一。强震的作用则会诱发大量的滑坡和崩塌等不良地质体,为泥石流的发生提供了必要的物源条件。为深入认识在强震和强降雨等极端事件下震区泥石流的危害特征及潜在风险,以汶川8.0级地震强震区汶川县城后山南沟为例,基于高分辨率RS影像和GIS技术,通过开展危险性和易损性评价、指标分类及赋值、空间计算及叠加分析,对该城区泥石流风险开展了实例研究,并基于此探讨了强震区城镇泥石流灾害风险评价方法,评价结果可为该城镇乃至西南强震区城镇泥石流灾害的防灾减灾规划提供参考和依据。
Debris flow is one of the serious geologic hazards in southwest of China, which is dangerous to urban towns located in mountain areas. The effect of earthquake can cause large numbers of landslides and falling which provide enough loose materials for debris flow. In order to know more characteristics and potential risk of the debris flow induced by the extreme events such as strong earthquake, intense rainfall, based of the high resolution remote sensing image and GIS, taking Nangou located in Wenchuan city as an example, the debris-flow risk assessment of Nangou is made by assessment of hazard and volubility, index classification, spatial calculation and spatial analysis. Then, the method for urban debris-flow risk assessment in strong seismic zone is discussed. The assessment results are of referential value for Wenchuan and other strong earthquake zones in southeast of China in planning urban debris-flow disaster prevention and reduction.
出处
《灾害学》
CSCD
2010年第4期43-47,53,共6页
Journal of Catastrophology
基金
地质灾害防治与地质环境保护国家重点实验室(成都理工大学)开放基金(GZ2009-09)
地质灾害防治与地质环境保护国家重点实验室研究基金资助
关键词
西南强震区
城镇泥石流
风险评价
RS
GIS
汶川县城
strong earthquake zone in southwest of China
urban debris flow
risk assessment
RS
GIS
Wenchuan
