摘要
以甘肃省为研究区域,选取降雨、地形、地质环境、人口、经济、道路、耕地、生态环境、医救能力、自救能力和财力支持指标,基于层次分析法建立了甘肃省地质灾害风险评估指标体系,利用GIS技术对甘肃省地质灾害进行风险评估。研究结果表明:(1)甘肃省地质灾害综合风险最高的地区为临夏州、天水市、陇南市、庆阳市部分地区、兰州市局部地区和陇南市部分地区,其面积为4.62万km^2,占总面积的10.58%;中等及较高风险地区面积分别为8.33万km^2,3.75万km^2,占总面积的19.08%,8.59%;较低和低风险区所占面积为26.97万Km^2,占总面积的61.75%;(2)甘肃省地质灾害风险呈现东高西低的分布格局,主要是由地形和人口分布造成的,在河东地区呈现片状分布,高风险区域主要分布在人口密集、地形起伏较大、降雨量多的地区;在河西地区高风险区域沿着河西走廊分布,在武威市凉州区、古浪县呈片状分布,在河西其他地区呈条带状分布;(3)从行政区划看,甘肃省地质灾害高风险区遍布14个市州83个区县(除甘南州玛曲县、酒泉市肃北县和阿克塞县无高风险区域外)。14个市州中,高地质灾害风险面积最大的市州为天水市,次之为临夏州、定西市、陇南市、兰州市、武威市。低地质灾害风险的市州为酒泉市,较低风险的市州为嘉峪关市、金昌市、甘南州。此评价结果对甘肃省区域地质灾害防治规划具有重要的指导作用。
We establish the geological disaster risk evaluation index system in Gansu Province based on the analytic hierarchy process, choosing a series of indexes including precipitation, landform, geological environment, population, economy, roads, plantation, ecological environment, medical ability, self- help ability and financial support. The results show that： （1）The regions in Gansu Province with highest geological disaster comprehensive risk are Linxia, Tianshui, Longnan, parts of Qingyang, parts of Lanzhou and parts of Longnan, this area is 46200 square kilometers （ 10.58 percent of the total area）. The regions with medium and high risk are 83300 square kilo- meters （19.08 percent of the total area） and 37500 square kilometers （8.59 percent of the total area）, respective- ly. The area of low risk regions is 269700 square kilometers （61.75 percent of the total area）. （2）Geological disas- ter risk in Gansu Province presents a distribution pattern that high risk in east and low risk in west. It is mainly be- cause of distribution of landform and population. The risk distributes scatteredly in the Hedong area, with high risk mainly in some areas with the dense population, rolling terrain, more rainfall. In the Hexi area, the high risk re- gions mainly distribute along the Hexi corridor, presenting sheet distributions in Liangzhou district and Gulang county, Wuwei, while with banding distribution in the other areas of Hexi. （3）From the angle of administrative divi- sions, the regions with high geological disaster high risk spread all over 14 city states, 83 counties of Gansu Prov- ince （except Maqu county in Gannan, Subei county and Akesai county in Jiuquan）. Among the 14 city states, the city state with the highest geological disaster risk area is Tianshui, the following are Linxia, Dingxi, Longnan, Lanzhou, Wuwei. The city state with the lowest geological disaster risk is Jiuquan. The city states with low risk are Jiayuguan, Jinchang, Gannan. The evaluation results will play an impor
出处
《灾害学》
CSCD
2017年第2期97-102,共6页
Journal of Catastrophology
基金
中国科学院"西部之光"人才培养计划博士项目(Y300031001)
甘肃省科技支撑项目(1504FKCA065)
中国地震局地震预测研究所基本科研业务费专项(2015IESLZ06)
关键词
地质灾害
风险评估
GIS
甘肃省
Gansu Province
geological disaster
GIS
risk assessment
