Influences of Groundwater Movement on Karst Collapse Based on GIS

2nd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Deng, Zongwei^1 ; Tang, Jia^1 ; Liao, Xuhang^1 ; Fan, Zijian^1 ; He, Shanshan^1 ; Dai, Wenchi^1

School of Civil and Engineering, Hunan City University, Yiyang

413000, China^1

关键词: Analytic hierarchy process (ahp);    Evaluation factor;    Geological conditions;    Ground water movement;    Human activities;    Karst areas;    Karst collapse;    Spatial analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/170/2/022124/pdf
DOI  :  10.1088/1755-1315/170/2/022124

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The karst area in Yuejiaqiao of Yiyang City was investigated in this study. 6 kinds of evaluation factors including large collapse pits, small collapse pits, faults, groundwater movements, depths of covering soil and human activities were particularly considered. Based on the spatial analysis functions of the geographic information system (GIS) platform and the analytic hierarchy process (AHP), a weighted calculation on the grids of the above evaluation factors was conducted to acquire the zoning map of karst collapse risks. The assessment results are accord with the actual situation as a whole. On this basis, a second assessment was carried out regardless of groundwater movements. Therefore, the influence of groundwater movements on the distribution of karst collapse was analyzed by comparing the two assessment conclusions. The results show that the groundwater movement increases the area of risk zones by 16.4% and greatly changes the distribution of risk zones. Moreover, the groundwater movement increases the risk of the investigated area by 0.1% - 0.3% depending on geological conditions.