摘要:
滑坡易发性评价是滑坡早期预警的基础,为了探索适用于秦岭山区的区域滑坡易发性评价方法,本文在陕西凤县1:5万详细调查的基础上,针对山区地质灾害调查的特点,对传统信息量模型进行改进,利用ArcGIS软件基于改进的信息量模型完成了凤县滑坡易发性评价。结果显示:凤县地质灾害分布主要与植被覆盖率、河流侵蚀和人类工程活动相关。根据评价结果将凤县滑坡易发性划分为四个等级:高易发区面积165 km2,占全县总面积的5.2%;中易发区面积686 km2,占21.5%;低易发区面积1195 km2,占37.5%;基本安全区面积1141 km2,占35.8%。根据此评价结果,为陕西凤县土地利用规划和滑坡防治提供依据,并为秦岭山区的区域滑坡易发性评价提供思路和方法。
Abstract:
Landslide susceptibility assessment is the basis for landslide early warning. In order to develop assess-ment methods of regional landslide susceptibility in Qinling mountain area, Fengxian County of Shaanxi Prov-ince, the authors comprehensively analyzed the geo-hazard investigation and mapping of 1:50000 scale. Accord-ing to the features of investigation in mountain area, this paper modifies the traditional information model. With ArcGIS and modified information model, the landslide susceptibility evaluation of the whole area of Fengxian County was carried out. According to the result, the distribution of landslide is mainly affected by river erosion, vegetation coverage and human activities. And the whole area was divided into four categories: the high grade ar-ea, which covers 165 km2, accounting for 5.2% of the total study area; the medium grade area, which covers 686 km2, accounting for 21.5%; the low grade area, which is measured 1195 km2, taking up for 37.5%; and the stable area that is measured 1141 km2, taking up for 35.8%. The result provided a basis for construction layout and land-slide prevention and reduction in Fengxian County, and also provided the guideline for landslide susceptibility zo-nation in other counties of the Qinling Mountain area.
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