中文摘要：

为了研究变化环境下潮白河流域地下水水循环规律，通过现场调查，结合环境同位素及水化学应用，对潮白河流域浅层和深层地下水采样，测定其氢、氧环境同位素及水化学成分，通过分析其变化特征判明地下水的补给来源以及各含水层的相互联系。降水和地下水中的环境同位素δD和δ^18O组成分析表明，降水是山前地下水的主要补给源，山区浅层地下水受蒸发影响非常强烈。水化学研究结果表明，山区地下水水质以Ca^2＋和HCO3^-为主，属Ca^2＋-Mg^2＋-HCO3^-型地下水。山前地下水类型为Ca^2＋-Mg^2＋-HCO3^-、Na^＋-K^＋-HCO3^-、Mg^2＋-Ca^2＋-HCO3^-和Ca^2＋-Mg^2＋-Cl^--SO4^2-。平原区地下水为Mg^2＋，Na^＋和HCO3^-滨海冲积海积平原为Ca^2＋-Mg^2＋-HCO^3-型和Ca^2＋-Mg^2＋-Cl^--SO4^2-型地下水。水化学分析证实了越流补给的存在。Ca^2＋和HCO3^-离子均呈山区高、山前和平原低、而滨海增高的趋势。沿潮白河流向地下水类型变化为：Ca^2＋-Mg^2＋-HCO3^-→Na^＋=K^＋-HCO3^-→Ca^2＋-Mg^2＋-HCO3^-。

英文摘要：

In order to study the formation and evolution law of groundwater quality in the Chaobai River Basin in the changing environment, groundwater in different layers was investigated and sampled to analyze their environmental isotope （hydrogen and oxygen-18） and hydrochemistry composition. The recharge source of groundwater and the relationship between aquifers can be identified by these results. The compositions of environmental isotope δD and δ^18 O of rainfall and of groundwater show that evaporation occurred to different degrees with rainfall recharging to the groundwater. The shorter the distance is to the Bohai Sea, the greater the groundwater affected by evaporation. The groundwater in plain was synthetically affected by different water sources. Rainfall was the main source of groundwater in piedmont, which was affected by evaporation strongly. Results of hydrochemical analysis showed that water quality in mountain groundwater was composed of Ca^2＋ and HCO3^-, named as Ca^2＋- Mg^2＋- HCO3^- type. The piedmont groundwater belonged tO Ca^2＋ - Mg^2＋ - HCO3^-, Na^＋ - K^＋ - HCO3^-, Mg^2＋ - Ca^2＋ - HCO3^- and Ca^2＋ - Mg^2＋ - Cl^- - SO4^2- type, groundwater in plain to Mg^2＋ , Na^＋ and HCO3^- type, and groundwater in alluvium-marine sediment plain near the Bohai Sea to Ca^2＋ -Mg^2＋ -HCO3^- type and Ca^2＋- Mg^2＋ - Cl^- - SO4^2- type. The hydrochemistry verified the leakage recharge was assured. The anions were high in mountainous region, low in piedmont and plain, and rose near the Bohai Sea. The groundwater type along the flow direction of the Chaobai River Basin was Ca^2＋ - Mg^2＋ - HCO^3-→Na^＋ - K^＋ - HCO^3- →Ca^2＋ - Mg^2＋ - HCO3^-. Based on these results, a concept model of groundwater formation and water quality evolution in the Chabai River Basin was set up. The research provided scientific basis for reasonably developing groundwater in this region.