基于GIS和信息量的滑坡灾害易发性评价——以三峡库区万州区为例

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摘要以滑坡灾害发育较多的三峡库区万州区为研究区，基于指标因素状态分级和因素相关性分析结果，选取坡度、坡向、坡体结构、地层岩性、地质构造、水的作用以及土地利用7项影响因素，以全区700多个滑坡灾害点为样本数据，依据各因素状态下发生的滑坡频率曲线和信息量曲线的突变点为等级划分的临界值来确定因素状态，并在此基础上建立易发性评价指标体系。基于GIS的栅格数据模型，应用信息量理论开展研究区易发性评价，研究结果表明：易发性高和较高的区域主要分布在土地利用总体规划中的建设用地、侏罗系中统上沙溪庙组第二、三段(J2s2，J2s3)、库水变动带和河网影响带以及万州城区。统计结果表明，处在高易发和较高易发区面积为1 210 km2，其中高易发区和较高易发区分别占研究区总面积的9.71%和25.9%，研究区易发性评价精度高达87%。本文完整的论述了县域滑坡灾害易发性评价的理论方法和技术路线，并以三峡库区万州区为例开展滑坡灾害易发性评价、结果分析以及预测精度评价等，为该区域滑坡灾害防治规划与预测预报提供技术支持，为全国范围内县域滑坡灾害易发性评价提供理论指导和技术参考。

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关键词 ：边坡工程, 滑坡易发性评价, 指标体系, 信息量, GIS, 三峡库区

Abstract：The susceptibility evaluation was conducted at Wanzhou district where landslide hazard largely occurred in the reservoir region of Three Gorges. Based on the results of the graded state of index factor and the correlation analysis，seven influence factors were chosen to be the evaluation indices including the gradient，the direction and the structure of slope，the stratum lithology，the geological structure，the role of water，and the land use. The frequency curve of landslide and the magnitude curve of information were drawn according to over 700 sample data of landslides. Catastrophe points on the curve were chosen as the critical value to determine the factor states on dividing the entire factors interval，so that to establish the system of susceptibility evaluation. Based on the grid data model of GIS and the method of weighted information value，the susceptibility evaluation was developed. The results show that the high and relatively high susceptibility areas are mainly the construction land，J2s2 and J2s3 stratum，area of reservoir water fluctuation，river net influenced area and urban area of Wanzhou city. The statistical results indicate that the areas with high and relatively high susceptibility taking up 1210 km2 in total are about 9.71% and 25.9% of the entire area under study respectively. The accuracy of the assessment is about 87%. This paper describes the theoretical methods and technical route of landslide hazards susceptibility evaluation in the district. The research provides a technical support for the regional landslide disaster prevention and forecasting and provides a theoretical guidance and technical reference for the nationwide county landslide hazards evaluation.

Key words： slope engineering landslide susceptibility evaluation index system weighted information value geographic information system(GIS) Three Gorges Reservoir

收稿日期: 2013-05-26

引用本文:

王佳佳，殷坤龙，肖莉丽. 基于GIS和信息量的滑坡灾害易发性评价——以三峡库区万州区为例[J]. 岩石力学与工程学报, 2014, 33(4): 797-808.
WANG Jiajia，YIN Kunlong，XIAO Lili. LANDSLIDE SUSCEPTIBILITY ASSESSMENT BASED ON GIS AND WEIGHTED INFORMATION VALUE：A CASE STUDY OF WANZHOU DISTRICT，THREE GORGES RESERVOIR. , 2014, 33(4): 797-808.

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http://www.rockmech.org/CN/Y2014/V33/I4/797

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