以强震区四川省汶川县为典型研究区,采用GIS技术与层次-信息量模型相结合的方法,针对震区震后特殊的地质环境,首先,选取了6类影响物源敏感性的因子(坡度、高程、距水系距离带、断层影响带、地震烈度、岩土体类型),对形成泥石流的最重要影响因素物源进行敏感性分析,生成汶川县滑坡敏感性评价图,将其归化至泥石流流域中,计算出泥石流敏感性,并分别在100 a一遇和50 a一遇2种不同降雨频率的影响下分析其泥石流危险性。最终,利用ArcGIS空间分析功能生成高、中、低3级危险性区划图,从而确定在不同降雨下需要重点监测与防治的泥石流沟道。
Abstract
The risks of debris flow in Wenchuan County, Sichuan Province of China are assessed as a typical case study by a combination of GIS technology and hierarchy-information quantity model. According to the special geological condition after earthquake, six factors affecting the source materials of debris flow are selected (slope gradient, elevation, water system’s influence zone, earthquake intensity, fault’s influence zone, and type of rock soil mass) to analyze the susceptibility of the most important source materials. The susceptibility maps of landslide and debris flow in Wenchuan County are obtained. Furthermore, the risks of debris flows under 100-year rainfall and 50-year rainfall are analyzed respectively. Finally, the risk zoning maps are obtained in ArcGIS, and debris flow canals in need of monitoring and treatment are determined.
关键词
泥石流 /
降雨频率 /
层次-信息量模型 /
GIS /
危险性评价
Key words
debris flow /
rainfall frequency /
hierarchy-information quantity model /
GIS /
risk assessment
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基金
科技部科技基础性专项课题(2011FY110100);中国地质调查局项目(12120113009900);国家重点实验室团队项目(SKLGP2012Z002)
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