刘世江, 王得双, 梁收运. 2018: 黄土地区城镇地质灾害风险区划以华池县柔远镇为例. 工程地质学报, 26(s1): 142-148. DOI: 10.13544/j.cnki.jeg.2018106
    引用本文: 刘世江, 王得双, 梁收运. 2018: 黄土地区城镇地质灾害风险区划以华池县柔远镇为例. 工程地质学报, 26(s1): 142-148. DOI: 10.13544/j.cnki.jeg.2018106
    LIU Shijiang, WANG Deshuang, LIANG Shouyun. 2018: GEO-HAZARDS RISK ASSESSMENT IN LOESS AREA: A CASE STUDY OF ROUYUAN TOWNSHIP IN HUACHI COUNTY,GANSU PROVINCE,CHINA. JOURNAL OF ENGINEERING GEOLOGY, 26(s1): 142-148. DOI: 10.13544/j.cnki.jeg.2018106
    Citation: LIU Shijiang, WANG Deshuang, LIANG Shouyun. 2018: GEO-HAZARDS RISK ASSESSMENT IN LOESS AREA: A CASE STUDY OF ROUYUAN TOWNSHIP IN HUACHI COUNTY,GANSU PROVINCE,CHINA. JOURNAL OF ENGINEERING GEOLOGY, 26(s1): 142-148. DOI: 10.13544/j.cnki.jeg.2018106

    黄土地区城镇地质灾害风险区划以华池县柔远镇为例

    GEO-HAZARDS RISK ASSESSMENT IN LOESS AREA: A CASE STUDY OF ROUYUAN TOWNSHIP IN HUACHI COUNTY,GANSU PROVINCE,CHINA

    • 摘要: 黄土高原是我国地质灾害最严重的地区之一,地质灾害频发,严重威胁着当地居民的人身、财产安全,阻碍城镇化建设步伐。基于GIS平台,以甘肃省华池县柔远镇为例,采用曲线拟合和均值变点法,研究发现大比例尺下提取黄土城镇地区平均起伏度的最佳单元大小为65 m65m,用层次分析法,选取灾害面密度、地层岩性、黄土层厚底、高程、坡度、坡向、起伏度、与沟谷距离、归一化植被指数、与道路距离、与建筑物距离等11个因子,建立黄土地区城镇危险性评价模型,依据土地覆盖类型进行易损性评估,利用栅格叠加工具得到风险区划,并划分出高风险、中风险、低风险、极低风险区域,分别占4.6%、11.7%、30.2%、53.5%,结果可为未来城镇化建设提供参考。

       

      Abstract: Loess plateau is one of the most serious geo-hazard areas in China. Frequent hazard brings large damage to the local human life and property and impedes the progress of county urbanization. In this paper, in the case of Rouyuan Township in Huachi County, Gansu Province, research findings that the best unite size of average relief is 65m65m in loess area in large scale, using the curve fitting and the mean change point method. The hazard assessment model of Rouyuan was established by the factors of history hazard intensity and potential hazard, including hazard surface density, formation lithology, the thickness of the loess, elevation, slope, aspect, relief, the distance to gully, NDVI,the distance to road, the distance to building, the weight of factors above were obtained by AHP. The vulnerability assessment was completed according to the difference between landcover after field survey and remote sensing interpretation. The risk assessment map was got from hazard assessment and vulnerability assessment by raster overlaying tool in ArcGIS. The study area was divided into high risk, middle risk, low risk, very low risk area, which covers 4.6%, 11.7%, 30.2%, 53.5% of total area, the result identifies with disaster and vulnerability of hazard-affected body, it can provide suitable suggestion to Rouyuan urbanization.

       

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