涪江上游泥石流灾损土地特征及典型流域淤积危险性研究

发布时间：2018-06-13 18:21

本文选题：涪江上游 + 泥石流灾损土地　；参考：《长江流域资源与环境》2017年11期

【摘要】：涪江上游以高山峡谷为主,人地矛盾突出,泥石流灾损土地是山区居民选择的主要生产生活场所。通过野外调查,初步查明目前涪江上游泥石流灾损土地以淤高的发展趋势为主,灾损土地扇形完整性程度达58%,以中等易发为主;大部分灾损土地距离主河距离为100~350 m,距离适中,水热条件良好。基于不同降雨频率条件下泥石流主沟内泥深、流量差异性,建立泥石流灾损土地的淤积危险范围确定方法;快速得到南坝窖子沟20 a一遇、50 a一遇、100 a一遇3种降雨频率条件下泥石流淤积危险范围,分别为0.167 km~2、0.292 km~2、0.420 km~2。为下一步建立基于土地潜力和灾害风险两个指标的灾损土地资源化潜力评估方法,探索泥石流灾损土地资源化利用模式,提供基础条件,并为山区居民进行土地利用提供快速指导。
[Abstract]:The upper reaches of Fujiang River are dominated by high mountains and canyons, and the contradiction between man and land is prominent. Debris flow is the main production and living place chosen by mountain residents. Through field investigation, it is preliminarily found out that the development trend of debris flow disaster damage land in the upper reaches of Fujiang River is mainly silt height, the fan-shaped integrity degree of the damaged land reaches 58, and the majority of the damaged land is mainly prone to occurrence, and the distance from most of the damaged land to the main river is 100 ~ 350 m, the distance is moderate. The water and heat conditions are good. Based on the difference of mud depth and discharge in the main ditch of debris flow under different rainfall frequency, the method of determining the dangerous range of deposition of debris flow damage land is established. The risk range of debris flow deposition under three kinds of rainfall frequency is obtained rapidly, which is 0.167 km / 2 (0.292 km2 / 2) and 0.420 km2 / 2, respectively, under the conditions of 50 years and 100 years of rainfall in Baizigou, Nanba, and the results show that the risk range of debris flow deposition is 0. 420km ~ (2). For the next step to establish the assessment method of land resource potential based on land potential and disaster risk, to explore the mode of land resource utilization of debris flow disaster, and to provide the basic conditions. And for mountain residents to provide rapid land use guidance.
【作者单位】：中国地质科学院探矿工艺研究所;中国地质调查局地质灾害防治技术中心;
【基金】：中国地质调查项目“涪江流域1∶5万环境地质调查”(DD20160251) 国家自然科学基金项目“渗流作用下孔隙水压力对坡面固体物质起动的机理研究”(41502330)~~
【分类号】：P642.23

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