北川县五星沟泥石流危险性评价及防治

发布时间：2018-04-24 09:58

本文选题：五星沟 + 泥石流　；参考：《西南科技大学》2014年硕士论文

【摘要】：五星沟泥石流发育北川县擂鼓镇,汶川5.12地震以后,沟内山体发生大量的滑坡及崩塌,在沟谷内形成了大量堆积体。2008年9月24日及2009年7月17日在强降雨的诱发下,五星沟发生特大型泥石流灾害,造成了严重的经济损失,严重的威胁着流域内居民的生命财产安全,因此对其进行研究、评价和治理,从而尽可能的防范灾害再次发生,尽力减轻损失。本研究在总结前人对泥石流的研究成果和研究经验的基础上,通过泥石流野外实地地质调查,查明五星沟流域面积为36.77Km2;主沟长为11.92Km;流域内海拔高程为677m~1880m。依据五星沟泥石流的地质特征,分析了泥石流形成的地形条件、水源条件和物源条件,在此基础上,推算了不同设计频率下的五星沟泥石流容重、流速、峰值流量、总流量、冲击力等动力特征和规模数据。本文参考前人相关研究成果,选取了松散固体物质储量、泥沙补给段长度比、流域面积、流域相对高差、主沟纵坡降、主沟床弯曲系数、山坡坡度、植被覆盖率、24h最大降雨量、流域人口密度10个影响因子作为泥石流危险性评价指标,利用层次分析法确定出各因子的权重,用模糊综合评判方法对该泥石流沟进行危险性评价,得出该泥石流的危险等级为高度危险。最后提出了在五星沟主沟双流1社上游设置一座拦挡坝;在五星沟所威胁到的各安置点外围布置单侧防护墙工程的防治措施及初步设计方案。
[Abstract]:Wuxinggou debris flow developed in Gaigu Town, Beichuan County. After the Wenchuan 5.12 earthquake, a large number of landslides and collapses occurred in the gully, forming a large number of accumulations in the gully. On September 24, 2008 and July 17, 2009, the debris flow was induced by heavy rainfall. A very large debris flow disaster occurred in the Wuxing Gully, which caused serious economic losses and seriously threatened the safety of the lives and property of the residents in the basin. Therefore, it was studied, evaluated and managed, so as to prevent the disaster from happening again as much as possible. Try to mitigate the loss. On the basis of summarizing the previous research results and experience of debris flow, through field geological investigation of debris flow, it is found that the area of Wuxinggou basin is 36.77 km ~ (2), the length of main ditch is 11.92 km ~ (2), and the elevation of the basin is 677 m ~ (1 880 m). According to the geological characteristics of debris flow in Wuxing gully, the terrain condition, water source condition and material source condition of debris flow formation are analyzed. On this basis, the bulk density, velocity, peak flow, total discharge of debris flow in Wuxing gully under different design frequencies are calculated. Impact force and other dynamic characteristics and scale data. In this paper, with reference to the related research results of predecessors, we select loose solid material reserves, length ratio of sediment supply section, basin area, relative height difference of watershed, longitudinal slope gradient of main ditch bed, slope gradient of slope slope, vegetation coverage rate and maximum rainfall for 24 hours. Ten influencing factors of population density are used as risk assessment indexes of debris flow. The weight of each factor is determined by analytic hierarchy process (AHP), and the risk of debris flow gully is evaluated by fuzzy comprehensive evaluation method. The dangerous grade of the debris flow is obtained as high risk. Finally, the prevention measures and preliminary design scheme of setting a blocking dam in the upper reaches of Shuangliu No. 1 in the main ditch of the Wuxing ditch and placing unilateral protective wall on the periphery of each placement site threatened by the Wuxing ditch are put forward.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P642.23

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