中文摘要：

以潍坊市北部超采区漏斗演变过程中浅层地下水水化学要素为依据,综合运用Radial plot图、Box-whisker图、Piper三线图解分析了超采区浅层地下水化学成分的演变情况,阐述了硬度、TDS的时空变化规律,揭示了近年来地下水超采影响下该区地下水水质变化规律。结果表明：①超采区水化学类型发生改变,2000年研究区浅层地下水水化学类型以Na^＋-K^＋-HCO3^-、Ca^2＋-Mg^2＋-HCO^-型为主,转变为以Na^＋-K^＋-HCO^--Cl^-和Ca^2＋-Mg^2＋-HCO^--Cl^-型为主;②地下水超采地下水改变了地下水的流场,增大了入渗补给,加剧水污染,导致总硬度和TDS浓度的增加;③从地下水化学成分的年际变化来看：Na^＋、K^＋、Cl^-、HCO^-含量变化与地下水位波动基本一致,离子浓度随地下水位的变化发生改变。Ca^2＋、Mg^2＋、SO4^2-的含量随着地下水位的降低而升高：地下水超采导致含钙镁矿物和石膏等矿物的溶解增多,入渗量增大,离子浓度升高。

英文摘要：

The study analyzed the hydrochemical characteristics of groundwater in over-exploited area of northern Wei Fang and elaborated the temporal and spatial variation of hardness and TDS. Meanwhile, it revealed the law of groundwater quality under the influence of over-exploi- tation in recent years. It is based on the hydrochemistry elements of shallow groundwater in the over-exploited areas by the comprehensive use of radial plot, Box-whisker diagram and Piper diagram. The results showed that ：①Hydrochemistry type in over-exploited area changed in the recent years. The chemical types of groundwater were mainly dominated by Na^＋-K^＋-HCO3^- and Ca^2＋-Mg^2＋-HCO3^- in 2000, and they were Na^＋-K^＋-HCO3^--Cl^- ,Ca^＋2＋-Mg^2＋-HCO3^--Cl^- in 2012.②Exeessive exploitation of groundwater changed the flow field of groundwater, increased the infiltration recharge and pollution of water, which resulted in the increase of total hardness and TDS concentration. ③From the view of interannual variation of the groundwater chemical composition： The changes in content of Na^＋ , K^＋ , Cl^- and HCO3^- were the same as groundwater level, and the ionic concentration changed with the fluctuation of groundwater level. Ca^2＋ , Mg^2＋ and SO4^2- increased with decrea- sing groundwater level. Over-exploitation leads to increase dissolution of minerals containing calcium and magnesium and gypsum, thereby increasing the infiltration capacity and ion concentration.