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“5·12”汶川地震后的强震区暴发了数次泥石流灾害,2010年8月13日都江堰龙溪河流域的泥石流灾害就是其中最严重的灾害之一。龙溪河流域在75 mm/h强降雨条件下,长11 km流域内共有45处暴发泥石流灾害。在现场调查和遥感资料分析的基础上,对都江堰龙溪河沿线泥石流灾害分布规律和流域面积、高差、距断层距离、坡度、岩性等影响要素的关系进行了研究,表明:1流域面积小于1.0 km2的泥石流流域占多数,达到总数的73.3%;2高差(200~400)m范围内泥石流点最多,占总数的41.3%%,其他高差区段差别不大;3在坡度为20°~40°的范围内,其数量占总数的90%以上;而在坡度20°以内的泥石流点相对较少;4距离发震断裂5 km范围内集中了该区域的所有泥石流分布点;距断裂带越近,灾害分布越多;5泥石流灾害点在各类岩层中均较发育,但硬岩地层地质灾害分布最为集中,占48.9%。通过以上规律研究旨在为泥石流灾害的预测和防治提供借鉴和参考。
In the strong earthquake area after May 12, Wenchuan Earthquake, there were several debris flow disasters. On August 13, 2010, the debris flow disaster in the Longxi River Basin in Dujiangyan was one of the most serious disasters. In the case of heavy rainfall of 75 mm / h in Longxi River Basin, a total of 45 outbreaks of debris flows occurred in 11 km of river basin. Based on the field survey and remote sensing data analysis, the distribution of debris flow hazards along the Longxi River in Dujiangyan and the relationship between the basin area, elevation, distance from faults, slope and lithology were studied. The results show that: Debris flow was less than 1.0 km2, accounting for 73.3% of the total; Debris flow was the largest in the range of 200-2 400 m, accounting for 41.3% of the total; The number of debris flow points is less than 20 °; 4, the distribution of all debris flow in the area within 5 km from the seismogenic fault; The closer to the fault zone, the more disasters distribute. (5) The debris flow disaster points are more developed in all types of rock formations, but the distribution of geological disasters in hard rock formations is the most concentrated, accounting for 48.9%. Through the above research, the purpose is to provide reference and reference for the prediction and prevention of debris flow disaster.