Risk Assessment of Geological Hazards of Qinling-Daba Mountain Area in Shaanxi Province Based on FAHP and GIS
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GUO Shuai, PEI Yanqian, HU sheng, YANG Dongdong, QIU Haijun and CAO Mingming
The paper herein selects nine disaster risk factors to build an evaluation index system by means of the fuzzy analytic hierarchy process (FAHP). Based on ArcGIS software, the risk assessment and regionalization of geological disasters in Qinling-Daba mountain area in Shaanxi province are carried out while the geological disaster points are used for verification. The results show that: 1) The conditions to trigger geological disasters in Qinling-Daba mountain area of Shaanxi are the slope 15°~45°, topographic relief degree more than 200m, perennial average rainfall about 950mm~1200mm, vegetation coverage less than 60%, distance from river network less than 2km, distance from fault less than 4km and the density of seismic points about 0.15-1.36 /100 km2. 2) The risk levels of geological disasters in Qinling-Daba mountain area of Shaanxi province are divided into several grades as extremely low risk area, low risk area, medium risk area, high risk area and extremely high-risk area, accounting for 8.63%, 14.56%, 31.56%, 31.91% and 13.34% of the area respectively. 3) Relevant verification shows that the risk zoning accuracy is high, which can provide a scientific basis for disaster prevention and reduction in Qinling-Daba mountain area of Shaanxi province.
FAHP; GIS; Risk Assessment; Qinling-Daba Mountains; Shaanxi Province