斜坡地质灾害敏感性评价中地势起伏度提取最佳尺度研究  

Optimal Scale for Extracting Relief Amplitude in Slope Geological Hazard Sensitivity Evaluation

作　　者：张明媚[1,2] 薛永安 ZHANG Mingmei;XUE Yongan(College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China;Deparment of Geological Surveying and Mapping Engineering, Jingzhong Shanxi 030600, China)

机构地区：[1]太原理工大学矿业工程学院,太原030024 [2]山西能源学院地质测绘工程系,山西晋中030600

出　　处：《太原理工大学学报》2020年第6期881-888,共8页Journal of Taiyuan University of Technology

基　　金：山西省应用基础研究计划项目面上青年基金项目(201901D211451);山西能源学院院级科研基金项目(ZZ-2018001);山西省软科学研究计划项目(2019041037-2);晋中市软科学计划项目(R201001)。

摘　　要：地势起伏度是斜坡地质灾害发育的重要地形因子之一,但目前在敏感性评价研究中较少考虑地势起伏度提取受提取单元尺度大小的影响这一因素。以山西省太原市西山地质块体为研究区,以ASTER GDEM V2和2012年研究区斜坡地质灾害分布信息为数据源,以ArcGIS为平台,以均值变点法对2×2,3×3,4×4,5×5,…,25×25共24个尺度开展了地势起伏度与地质灾害分布峰值、平均地势起伏度和地势起伏度峰值之间的关系分析。结果表明:最佳提取单元在斜坡地质灾害分布峰值、平均地势起伏度和地势起伏度峰值上表现不同,分别为9×9网格、12×12网格、12×12网格,综合考虑区域地貌演变和地质灾害演变因素,选择9×9网格作为研究区斜坡地质灾害敏感性评价时的最佳地势起伏度提取单元,最佳统计面积为0.0729 km2.Relief amplitude is one of the important topographic factors in the development of slope geological hazards,but the influence of scale of extraction unit on extracting of relief amplitude is seldom considered in sensitivity assessment studies.Xishan geological block was taken as the research area in Taiyuan City,Shanxi Province,ASTER GDEM V2 and the slope geological hazard distribution information in the research area in 2012 were used as data source in this paper.Arc GIS was taken as the platform,and the mean change point method was adopted to analyze the relationship between the relief amplitude and the peak distribution of geological hazards,the average relief amplitude and the peak of relief amplitude with scales of 2×2,3×3,4×4,5×5,…,25×25,total of 24 scales.The results show that the optimal extraction unit behaved differently on the peak distribution of slope geological hazards,the average relief amplitude,and the peak relief amplitude,which were 9×9 grid,12×12 grid,and 12×12 grid,respectively.By taking into account the evolutions of regional geomorphology and hazard evolution factors,the 9×9 grid was selected as the optimal extraction unit for topographic relief amplitude in the sensitivity assessment of slope geological hazard in the studied area,with the optimal statistical area of 0.0729 km2.

关 键 词：斜坡地质灾害 敏感性评价 地势起伏度 地形因子 ASTER GDEM V2 均值变点法 

分 类 号：P208[天文地球—地图制图学与地理信息工程] P217[天文地球—测绘科学与技术]