滑坡危险性评价中关键因素的筛选

Selection of key factors in assessment of landslide hazard

影响滑坡发育的因素是多方面的,各因素之间又相互影响、相互制约,而且不同因素对滑坡发育的贡献有很大差异,要准确合理地进行区域滑坡危险性评价,首先必须对各致灾因素之间的关系进行详细分析,合理选择参加评价的关键因素。针对这个目的,提出了综合考虑滑坡敏感性综合指标(IEL)和单因素方差分析结果(P)进行关键因素筛选的方法。首先采用百分比分段的方法进行致灾因素数据的类别划分,然后分别计算各致灾因素的两种指标大小,综合考虑两种指标以实现滑坡关键因素的筛选,当IEL和P指标都满足条件时,才能归入到关键因素中。将该方法应用于庆元地区滑坡灾害危险性评价,获得了比较满意的结果,筛选结果符合实际情况。

There are numerous factors that will have more or less impacts on the development of landslides. Most of these factors are interacting, and their contribution to the landslides has a great variability. For the regional landslide hazard assessment, the dependency of the factors must be analyzed quantitatively. Accordingly, the key influential factors of landslide should are selected. A composite approach to combine the integrated susceptibility index of landslide （IEL） and single factor variance （P） is put forward. Firstly, the data of hazard-formative factors are classified ou the basis of their segmental percentage. Since the IEL and P can be calculated, thus the key factors of landslide may be selected under considering two iudices. Only both IEL and P satisfy the condition, the factor can be taken as key factor. This approach is used in Qingyuan Region, Zhejiang Province, and the result is in line with practical situation.