基于证据权法的循化县积石镇地质灾害孕灾分区及孕灾因素简析

Analysis of pregnancy-disaster zoning and pregnancy-disaster factors of geological disasters in Jishi Town of Xunhua County based on the right of evidence method

积石镇位于青海省循化县北部,黄河沿岸,是循化县的政治、经济和文化中心。由于镇内地形破碎、沟壑纵横,地质环境条件差,是泥石流、滑坡、崩塌等地质灾害的高发区。随着境内基础设施建设的快速发展,人类工程经济活动对地质环境的破坏日益加剧,地质灾害的潜在危害也愈发严重。前人研究主要集中在该区域地质灾害体的基本特征,对于区域地质灾害的孕灾因子和规律尚未进行详细分析。本文通过证据权法,结合野外调查选取了研究区的孕灾因子,并在ArcGIS软件平台的支持下,对研究区的孕灾地质条件进行了分区。通关研究分析区域内的高程、坡度、坡向、地形起伏度、距断层距离、距河流距离、距公路距离、工程地质岩组共8个孕灾因子,进而总结出研究区的地质灾害孕灾规律。本研究可有效预防和减轻地质灾害对人民生命财产的危害,为积石镇的城镇规划和合理开发利用提供重要的基础依据。

Jishi Town is located in the north of Xunhua County,Qinghai Province,along the Yellow River,is the political,economic and cultural center of Xunhua County.Due to the broken terrain,ravines and poor geological environment conditions in the town,it is a high occurrence area of geological disasters such as debris flow,landslide and collapse.With the rapid development of domestic infrastructure construction,the damage of human engineering economic activities to the geological environment is increasing,and the potential harm of geological disasters is becoming more and more serious.Previous studies mainly focus on the basic characteristics of the regional geological hazards,and the factors and laws of regional geological hazards have not been analyzed in detail.In this paper,disaster-prone factors in the study area were selected through the weight of evidence method and field investigation,and disaster-prone geological conditions in the study area were partitioned with the support of ArcGIS software platform.Through the study,eight disaster-inducing factors including elevation,slope,slope direction,topographic relief,distance from fault,distance from river,distance from highway and engineering geological rock group were analyzed,and the laws of geological disaster pregnancy in the study area were summarized.This study can effectively prevent and reduce the hazards of geological disasters to people′s lives and property,and provide an important basis for the urban planning and rational development and utilization of Jishi town.