四川省大渡河流域地质灾害分布及其发展趋势浅析

四川大渡河是长江的主要支流之一。是四川重要的水能资源基地。目前已建电站及拟建电站17个,总装机可达2336万kW,年发电量988.7亿kW.h。大渡河流域受地形、岩性、构造、斜坡结构等影响,地质灾害频繁。据不完全统计大渡河流域共发生地质灾害913处,其中滑坡385处,崩塌105处,泥石流358处,不稳定斜坡65处。随着大渡河梯级水电工程的开发,地质灾害的影响日益显著。文章通过统计分析,从地貌、岩土体结构、构造等方面对大渡河流域地质灾害的控制因素和分布规律进行了初步探讨,并对流域内地质灾害的发展趋势作了科学合理的预测,为今后流域的经济发展和防灾减灾提供了科学依据,以便将地质灾害的危害降到最低。

Analysis of the geological hazards' distribution and development trend in Dadu River Catchments of Sichuan Province

Dadu River is one of the main branches of Yangtse River.And it is Sichuan's important base of hydroenergy resource.Up to the present time,there are 17 hydropower stations in Dadu River,including built and under-building,whose installed capacity will be up to 23,360,000 kw,and electric energy production will be up to 98,870,000,000 kw.h per year.Due to the influence of landform,the property of rock,structual geology,slope structure and so on,geo-hazards are very active in river valley.According to the incomplete statistic,there have been 913 geohazards,which include 385 landslides,105 rockfalls,358 debris flows,and 65 instability slopes.With the development of Dadu River's step water-power constructions,the geo-hazards will be increasingly active.Basing on the landform,rock and soil structure,structural geology etc in Dadu River basin,the paper preliminarily anlysises the controlling factors and regularities of distribution of the geohazards by statistic analysis and makes a scientific,reasonable trend of development,and takes a reference with the river's economic advance and geo-hazards'prevention and cure in order to reduce hazards' damage.