三峡库区重庆市丰都县滑坡灾害危险性评价

Assessments of landslide hazards in Fengdu County,Chongqing City,Three Gorges reservoir region of the Yangtze River,China.

在对三峡库区丰都县滑坡灾害调查和统计分析的基础上,初步概括了滑坡灾害的分布特征和主要影响因素,进而利用综合信息模型评价了丰都县滑坡灾害的危险性,将丰都县滑坡灾害的危险性划分为高危险区、中危险区、低危险区和基本安全区4个等级。其中,高危险区和中危险区分别占全县总面积的2.6%和23.2%,主要分布在长江干流及其支流两岸的居民相对集中区,不同规模的滑坡灾害经常发生,因此潜在危害也很大;低危险区占全县总面积的47.5%,偶有小规模的滑坡灾害发生;基本安全区占全县总面积的25.5%,在人为因素的诱发下可能偶有小规模的滑坡灾害发生,适合于大型工程建设和城镇居民点建设。

On the basis of investigation and statistic analysis of landslide hazards in Fengdu County. in the reservoir region of the Three Gorges project on the Yangtze River, the distribution characteristics and main influence factors of landslide hazards are outlined. Then the risk of landslides in Fengdu is assessed using an integrated information model. According to the land- slide risk, the county is divided into the high-risk （destructive）, medium-risk （disastrous）, low-risk （likely disastrous） and essentially safe （non-disastrous） areas. The high- and medium-risk areas account for 2.6% and 23.2% of the area of the whole county respectively and are mainly distributed in townships and highways along south bank of the Yangtze River and residential quarters along two flanks of the Yangtze River and its distributaries, where landslide hazards of different scales occur frequently and thus the potential risk is great. The low-risk areas make up 47.5% of the total area of the whole county, where small landslides and rock fails occur occasionally. The essentially safe areas take up -25.5% of the region, where, induced by artificial factors, small landslide hazards may happen occasionally, so these areas are suited to construction of largesized engineering works and residential areas of townships.