延安市滑坡分布规律及发育特征

发布时间：2018-03-09 08:01

本文选题：延安市　切入点：滑坡　出处：《地质科技情报》2017年02期 　论文类型：期刊论文

【摘要】：以延安市13个县区地质灾害详细调查成果为基础,对区内滑坡进行了统计分析,并采用ArcGIS软件将滑坡叠加在地形图中,研究了区内滑坡的时空分布规律和发育特征。研究表明,空间上,北部砂黄土地区滑坡发育数量明显比南部壤黄土地区多,滑坡在一、二级河流河谷区两侧及多条河流交汇处集中分布,阴坡发生滑坡的比率高于阳坡,滑坡在年降雨量多的地区集中分布,在人口和交通工程密集区域内集中分布;时间上,滑坡在6-9月份的雨季相对集中,在晚更新世末和全新世初期相对集中。其发育特征表现为:区内滑坡有7种类型,但以黄土滑坡(黄土内滑坡、黄土与红黏土接触面滑坡、黄土与基岩接触面滑坡、沿古土壤面滑坡)为主,滑坡体长度主要集中在6~300m,宽度主要集中在15~300m,厚度主要集中在1~20m,滑坡体面积在0.009 6×10~4~40.5×10~4 m~2之间,体积在0.026 88×10~4~1 620×10~4 m~3之间,其中以中小型滑坡为主;提出了因地制宜的针对性建议,为区域内的防灾减灾工作提供了一定的参考。
[Abstract]:Based on the detailed investigation results of geological hazards in 13 counties and districts of Yan'an City, the landslide in this area is statistically analyzed, and the landslide is superimposed on the topographic map by using ArcGIS software. The temporal and spatial distribution and development characteristics of landslide in this area are studied. In space, the number of landslides in the sandy loess area in the north is obviously more than that in the loessial region in the south. The landslide distribution is concentrated on the two sides of the first and second class river valley and the intersection of many rivers, and the occurrence rate of landslide on the shady slope is higher than that on the sunny slope. Landslides are concentrated in areas with high annual rainfall, and concentrated in areas with dense population and transportation projects. In time, landslides are relatively concentrated in the rainy season in June-September. At the end of the late Pleistocene and the early Holocene, there were 7 types of landslides in the region, but the landslide was loess landslide (loess internal landslide, loess and red clay interface landslide, loess and bedrock interface landslide). The landslide along the paleosol surface is dominated by the landslide, the length of the landslide is mainly concentrated at 6 ~ (300) m, the width is mainly concentrated at 15 ~ (300) m, the thickness is mainly 1 ~ (20) m, the area of the landslide is between 0.009 6 脳 10 ~ (4) and 40.5 脳 10 ~ (4) m ~ (2), and the volume is between 0.026 88 脳 10 ~ (10) ~ (4) ~ (1 620) 脳 10 ~ (4) m ~ (-3), in which the middle and small landslide is the main one. Some suggestions are put forward in order to provide some reference for disaster prevention and mitigation in the region.
【作者单位】：长安大学地质工程与测绘学院;
【基金】：国家自然科学基金项目(41502278)
【分类号】：P642.22

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