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兰州地处中国地理中心,肩负着经济建设和战略转移的重任,同时兰州又是在中国滑坡、泥石流灾害最严重的城市之一。近50年来,共发生地质灾害194次,造成630人伤亡,直接经济损失3.4亿元。新的调查显示,全区地质灾害隐患点394处,其中泥石流126条,滑坡95处、崩塌28处、地面塌陷11处、不稳定斜坡134处。根据危险性评估,威胁特重的有69处,重的有100处,中度的有149处,轻度的有76处。区内地质构造发育、新构造运动强烈,地形地貌复杂,降雨集中,人类活动强烈,通过对兰州市区地形、地貌特点和滑坡泥石流危害及成因分析,提出了防治对策。
Lanzhou is located in the geographical center of China and shoulders the task of economic construction and strategic shift. At the same time, Lanzhou is one of the cities with the most serious landslides and debris flows in China. In the past 50 years, a total of 194 geological disasters have occurred, resulting in 630 casualties and a direct economic loss of 340 million yuan. The new survey shows that there are 394 hidden troubles in geological disasters in the region, including 126 debris flows, 95 landslides, 28 landslides, 11 ground subsidences and 134 unstable slopes. According to the risk assessment, there are 69 areas of special threat, 100 of which are heavy, 149 are moderate and 76 are light. The geological structure in the area is developed, the neotectonic movement is intense, the terrain and physiognomy are complex, the rainfall is concentrated and the human activities are intense. Based on the topography, geomorphic features and landslide debris flow hazards and their causes in Lanzhou, prevention and control measures are put forward.