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巴东县新城区是三峡库区滑坡灾害最为发育的地段之一。通过还原滑坡形成前的物质组成和历史环境,选取了影响滑坡发育的地层岩性、水位影响带等9项评价指标。完善了基于地形条件的不规则单元划分方法,对研究区进行了斜坡评价单元的划分,使得评价单元具有更明确的地质意义和更完善的地质结构。此外,将各影响因素图与斜坡评价单元分布图叠加得到计算单元,在计算单元信息量求解的基础上提出了斜坡评价单元信息量的计算方法,进行了基于斜坡评价单元的危险性区划,得到了巴东县新城区滑坡灾害危险性区划图。分析结果表明,水位影响带、居民区、公路分布区及顺向坡坡型与滑坡灾害发生的相关性最大。高危险区占城区面积的16.4%,主要分布在长江两岸临江地段。
Badong County New City is one of the most developed landslides in the Three Gorges Reservoir Area. By restoring the material composition and historical environment before the landslide formation, nine evaluation indexes such as stratigraphic lithology and influence zone of water level influencing landslide development were selected. The division method of irregular elements based on topographic conditions is improved. The division of slope evaluation units is carried out in the study area so that the evaluation units have a more definite geological meaning and a more perfect geological structure. In addition, the calculation unit is obtained by superposing each influence factor map and the slope evaluation unit distribution map. Based on the calculation of the information amount of the calculation unit, a method for calculating the information amount of the slope evaluation unit is proposed, and the risk division based on the slope evaluation unit is obtained. Badong County New City landslide hazard zoning map. The analysis results show that water level impact zone, residential area, highway distribution area and forward slope type have the highest correlation with landslide hazard. High-risk areas account for 16.4% of the urban area, mainly in the Riverside area across the Yangtze River.