三峡库首区滑坡空间分布特征分析及危险性评价

The Spatial Distribution Characteristics and Risk Assessment of Landslides in the Head Region of the Three Gorges Reservoir

采用遥感和GIS技术从宏观上对三峡库首区三峡工程二期、三期治理滑坡和新增滑坡的空间分布与地形地貌、地层岩性、断裂构造、水系流域和人为影响等因素的相关程度进行分析,获取孕灾环境特征规则,并对其危险性进行评价。结果表明,地形因子中的高程、坡向和高程变异系数与滑坡的相关性较高;研究区内断裂构造对滑坡发育的控制作用不明显;研究区滑坡体的空间分布受到不同因子组合的约束,可根据不同因子组合约束的权重对研究区滑坡危险性进行评价。

The risk of landslides, which have been ject, are increasing because of reactivated landslides and new the cyclical loading landslides would th treated in phase Ⅱ and Ⅲ of the Three Gorges pro- and unloading of the Three Gorges reservoir. The reaten people＇s lives and the safety of property. In order to mitigate the risk, remote sensing （RS） and geographic information systems （GIS） are used to study the correlation between the distribution of landslides and other factors, pography, lithology, faults, water basins and anthropogenic influences. The results show evation, aspect and elevation variation coefficient in topography have higher correlation wi slides. Moreover, faults have no obvious effect on the quantity of landslides. The spatial of the landslides in the study area is restricted by the combinations of factors. Accor weights of these restrictions, a risk assessment of landslides is carried out.