基于GIS技术的湛江市区浅层地下水防污性能分析与评价

近年来,随着工业化和城市化进程的加快以及"三废"排放问题的加剧,湛江市区浅层地下水普遍受到了污染。参照DRASTIC方法的基本思路,兼顾多方面因素,选择包气带影响(厚度、岩性、结构)和地形作为评价指标;并借助于GIS技术强大的输入、空间分析及制图功能,对该地区浅层地下水防污性能进行了评价和分区,评价结果与实测NO3-浓度分布状况表现出较好的负相关性,说明浅层地下水防污性能分布图在一定程度上可为该地区政府管理部门制定城市规划、工业布局和地下水资源保护提供决策参考。

ANALYSIS AND ASSESSMENT OF SHALLOW GROUNDWATER VULNERABILITY IN ZHANJIANG AREA BASED ON GIS

In recent years,with the rapid process of industrialization and urbanization and the severity of"Three Wastes"discharge problems,Zhangjiang’s shallow groundwater has been widely contaminated.Based on the idea of DRASTIC model and according to the extensive factors,zone of aeration(depth,lithology,structure)and topography were selected as assessment factors of shallow groundwater vulnerability in Zhanjiang area.With powerful input,special analysis and mapping functions of GIS,quantitative assessment and division were performed for shallow groundwater vulnerability of this area.The shallow groundwater vulnerability distribution map developed had well negative correlation with measured nitrate concentrations in 2003 in this area.This indicated that the shallow groundwater vulnerability distribution map can provide decision-making reference for government to establish city planning,industrial layout and groundwater resources protection.