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在人类活动较多的地区,影响地下水脆弱性的相关人为因素分布格局各时期不同,研究地下水脆弱性的时空格局转变,探求其各时期分布的特点,预测其发展的趋势,对于合理制定发展规划、针对性地降低地下水污染的风险有着重要的意义.以北京市朝阳区的水文地质和人文社会数据资料为基础,建立了基于DRASTIC模型考虑了土地利用类型等人为因素的地下水脆弱性综合评价模型.通过计算Global Moran’sⅠ指数、Getis-Ord Gi*指数(G指数)定量表征了研究区地下水脆弱性的时空格局演变,通过研究区G指数的质心和标准差椭圆定量分析了地下水脆弱性的分布特点和变化趋势.结果表明:研究区2004年、2010年和2016年高脆弱性地区面积呈逐年递减趋势,地下水脆弱性的高值聚集区主要分布在东北、西南地区,其中东北地区脆弱性逐年改善,而西北地区变化不大,造成变化的主要原因是土地利用类型的变化和化肥使用的减少.
In the areas with more human activities, the distribution patterns of human factors influencing the groundwater vulnerability are different in different periods, studying the temporal and spatial pattern changes of groundwater vulnerability, exploring the characteristics of their distribution in different periods and predicting their development tendency. , Aimed at reducing the risk of groundwater pollution is of great significance.Based on the data of hydrogeology and humanities and social sciences in Chaoyang District of Beijing, a comprehensive groundwater vulnerability assessment model based on DRASTIC model with human factors such as land use type is established . By calculating the Global Moran’sⅠ index and the Getis-Ord Gi * index (G index), the temporal and spatial patterns of groundwater vulnerability in the study area are quantitatively characterized. Based on the centroid and standard deviation ellipse of the G index of the study area, the quantitative analysis of groundwater vulnerability Distribution characteristics and trends of the study area.The results showed that the areas with high vulnerability in 2004, 2010 and 2016 decreased year by year, and the high concentrations of groundwater were mainly distributed in the northeast and southwest of China, among which the vulnerability in Northeast China Improve year by year, while little change in the northwest, the main reason for the change is The type of change and with reduced use of fertilizer.