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研究区受“5.12”汶川地震、“8.18”泥石流、“4.20”芦山地震等大型地质灾害叠加作用的影响,区域上构成独特的工程地质环境条件.通过系统调研和收集宝兴冷木沟地震前后泥石流物源地质原型和泥石流灾害防治的第一手资料,重点查清泥石流形成的物源条件,对比研究“4.20”芦山地震前后泥石流物源特征、动/静储量比例.分析研究结果表明冷木沟发育点状物源、线状物源、面状物源,其中震前震后均以沟床侵蚀物源(线状物源)为主,占76.110%和60.690%.“4.20”芦山地震后,沟岸堆积物源(点状物源)却成倍增多,为48的倍率,超31.490个百分点.整体上,除沟岸侧蚀物源(面状物源)外,同一流域段内,震后物源动储量高于震前.静动储量线性关系较为明显,相关系数R2达0.8~1.0,均属高度正相关.
The study area is affected by the superposition of large-scale geological disasters, such as Wenchuan 5.12 Wenchuan earthquake, 8.18 debris flow, 4.20 Lushan earthquake and other special geo-environmental conditions in the area. Through systematic investigation and collection Before and after the Xing-Leng-Mogou Earthquake, the geological prototype of debris flow source and debris flow disaster prevention and control of the first-hand information, focusing on identifying the source of debris flow formation conditions, comparative study of “4.20” Lushan earthquake before the debris source characteristics, dynamic / static reserves The analysis results show that point source, linear source and planar source are developed in Lenggougou, of which the source of gully erosion is the main source (linear source), accounting for 76.110% and 60.690 %. “4.20 ” After the Lushan earthquake, the sediment source (point source) in the ditch bank multiplied by a factor of 31.490% over 48. As a whole, In the same basin, the reserves of reserves after the earthquake are higher than those before the earthquake, and the linear relationship between the reserves of static and dynamic storage is obvious. The correlation coefficient R2 of 0.8 ~ 1.0 is highly positive.