中文摘要：

针对华南丘陵山区浅层滑坡灾害的形成机理及特征,对滑坡风险影响因素进行重点研究和筛选,提出了丘陵山区浅层滑坡灾害风险分析指标体系及其区划方法。从浅层滑坡的发生机理出发,选用斜坡单元作为山区滑坡灾害风险区划的基本单元,并利用DEM完成单元的划分。将影响滑坡灾害形成的地形起伏度、坡度、坡向、岩土结构面特征、地层岩性、风化层厚度、开垦切坡强度、居民点切坡强度、道路切坡强度九项因子作为小流域山区滑坡灾害的危险性指标,以道路密度、建设强度和开垦强度指数作为易损性指标,建立浅层滑坡灾害风险评价指标体系。最后,通过风险评价模型进行风险评价和区划。

英文摘要：

Based on the study of the landslide formation mechanism and characteristics in small watershed region,the present paper has brought about a method for landslide risk assessment.For this purpose,we have,first of all,chosen a slope-unit element as the basic cell unit for a risk map.At the same time,the division of the slope units can be done with a digital elevation model（DEM） and a GIS system.Secondly,we have established an index system of the hazard assessment for landslide risks by analyzing the influential factors that may lead to the landslide hazards.In the said index system of the hazard assessment,we have imposed nine variables likely to lead to the landslide hazards,including the relief,the slope gradients,the slope orientation,the soil-composition characteristic features,the formation lithological features,the intensity of the land reclamation,the cutting slope by the path-way system,as well as the cutting cultivation slope.Thirdly,we have also established the index system of the social economic vulnerability through an analysis of the social and economic characteristics in the small watershed areas.All the above three factors can be taken as dominant decisive for the local agricultural development and the farm-land intensity of construction based on the index system by GIS.And,finally,we have automatically overlaid a landslide risk regional division on the two data levels of hazard and vulnerability forecast by means of GIS,and,in turn,we have deduced the land-use risk map through the risk assessment model and calculation of the risk-involving degrees.