基于尺度效应的滑坡影响因素的权重修正研究  

Study of Scale Effect-Based Calibration on Weight of Factors Influencing Landslide

作　　者：朱吉祥[1] 张礼中[1] 周小元[1] 王乾[1] 陆琰[1] 

机构地区：[1]中国地质科学院水文地质环境地质研究所,石家庄050061

出　　处：《水土保持研究》2015年第5期181-185,共5页Research of Soil and Water Conservation

基　　金：中国地质调查局地质调查项目"全国主要城市环境地质综合评价"(1212010535501);中国地质调查局地质调查项目"地下水资源数据集成与服务系统建设"(1212011120426)

摘　　要：控制滑坡发生的影响因素主要包括地层岩性、地质构造、地形地貌以及降水等因素。各影响因素在滑坡演变过程中地位存在差别,这种差别可以用影响因素的权重表征。考虑到滑坡及其影响因素的尺度特征,滑坡灾害危险性评价的结果必然也会受尺度效应的影响,主要表现为不同影响因素的权重会随尺度规模的改变而产生差异性的变化。以小尺度的旺苍县滑坡危险性评价为例,比较分析影响因素权重修正前后的滑坡危险性评价结果与验证结果,结果表明:在小尺度上,空间变化速率较慢的影响因素,包括地层岩性、地貌类型、多年降水分布等,权重会变小;而空间变化速率变化较快的影响因素,包括坡度、坡向等,权重则会变大;在大尺度上,空间变化速率较慢的影响因素,包括地层岩性、地貌类型、多年降水分布等,权重会变大;而空间变化速率变化较快的影响因素,包括坡度、坡向等,权重则会变小。The influencing factors which control the landslide occurrence mainly include lithology, geological structure, topography, precipitation and so on. The status of the factors in landslide evolution is different, and can be expressed by weight. As considering the scale characteristic of the landslide and its influencing factors, it is inevitable that the result of landslide hazard assessment would be influenced by scale effects, which mainly represents the change of the weights of landslide influencing factors with the change of the scales. We compared and analyzed the result of the landslide assessment which obtained before and after the weight of factor modification. The result showed that on the small scale, the weight of these factors of which the rate of spatial change was slow such as lithology, topography, precipitation and so on, would be smaller, however, the weight of other factors of which the rate of spatial change was rapid, such as slope, aspect slope and so on, would be greater; on the large scale, the weight of landslide influencing factors was contrary direction to change.

关 键 词：滑坡 危险性评价 尺度效应 权重 四川旺苍 

分 类 号：P694[天文地球—地质学]