基于多期DEM和滑坡强度的滑坡风险评估

摘要

滑坡危险性定量评估是滑坡风险评估中的关键和难点,也是当前国际风险管理研究中的热点问题.以滑坡密集分布的黑方台南塬为研究区,以32处典型滑坡为研究对象,依据多期三维数字高程模型(DEM),提出了一种基于强度的滑坡危险性定量评估技术方法.根据多期三维地形信息的解译及野外调查,编制多期滑坡分布图,计算滑坡活动的频率.利用GIS技术,利用滑坡体积与速度的乘积计算滑坡强度.将滑坡危险性定义为滑坡频率和滑坡强度的乘积,同时调查和分析了黑方台地区各类承灾体的类型、价值及其在相应滑坡强度下的易损性,在此基础上开展了单体滑坡风险评估和黑方台南塬滑坡风险区划.%Quantitative hazard assessment is the key and difficulty in landslide risk assessment and is also the hot issue in the current international risk management study.The method of landslide hazard quantitative assessment is proposed based on multi-period three-dimensional DEM and landslide intensity in the southern part of Heifangtai terrace,where 32 typical landslides are extensively distributed.Via interpretation of muir-period three-dimensional terrain information and field survey,the multi-period landslide inventory map was compiled and on this basis,the landslide fiequency was calculated.Landslide intensity was calculated by the product of landslide volume and velocity using GIS technology.Landslide hazard was defined as the result of the landslide frequency timing landslide intensity.In the mean time,the types,values and vulnerability in corresponding landslide intensity of the elements at risk were investigated and analyzed in Heifangtai.On such a basis,single landslide risk assessment was carried out,and the landslide risk zoning map of southern Heifangta was compiled.