發(fā)布時間：2018-03-09 08:01

  本文選題：延安市　切入點：滑坡　出處：《地質科技情報》2017年02期 　論文類型：期刊論文

【摘要】：以延安市13個縣區(qū)地質災害詳細調查成果為基礎,對區(qū)內滑坡進行了統(tǒng)計分析,并采用ArcGIS軟件將滑坡疊加在地形圖中,研究了區(qū)內滑坡的時空分布規(guī)律和發(fā)育特征。研究表明,空間上,北部砂黃土地區(qū)滑坡發(fā)育數量明顯比南部壤黃土地區(qū)多,滑坡在一、二級河流河谷區(qū)兩側及多條河流交匯處集中分布,陰坡發(fā)生滑坡的比率高于陽坡,滑坡在年降雨量多的地區(qū)集中分布,在人口和交通工程密集區(qū)域內集中分布;時間上,滑坡在6-9月份的雨季相對集中,在晚更新世末和全新世初期相對集中。其發(fā)育特征表現為:區(qū)內滑坡有7種類型,但以黃土滑坡(黃土內滑坡、黃土與紅黏土接觸面滑坡、黃土與基巖接觸面滑坡、沿古土壤面滑坡)為主,滑坡體長度主要集中在6~300m,寬度主要集中在15~300m,厚度主要集中在1~20m,滑坡體面積在0.009 6×10~4~40.5×10~4 m~2之間,體積在0.026 88×10~4~1 620×10~4 m~3之間,其中以中小型滑坡為主;提出了因地制宜的針對性建議,為區(qū)域內的防災減災工作提供了一定的參考。
[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.
【作者單位】： 長安大學地質工程與測繪學院;
【基金】：國家自然科學基金項目(41502278)
【分類號】：P642.22

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