中文摘要：

为了解天津滨海地区咸／海水入侵的水化学特征，对该区地表水的化学组成进行了全面研究．结果显示，由山前平原到滨海平原，水化学的组成呈明显的地带性分布．研究水体TDS的含量较高，咸化程度明显，由淡水逐渐向卤水演化；同时，水化学类型由HCO3-Ca型，以及其它混合类型逐渐向Cl-Na型演化．Gibbs图解分析表明，蒸发-浓缩作用是控制该区地表水化学组成的主要原因；而咸／海水入侵以及由其导致的阳离子交换反应、碳酸钙的沉淀／溶解等对其也有重要的影响．

英文摘要：

The coastal area of Tianjin is one of the salt/sea water intrusion regions in China. In order to understand the chemical characteristics of the salt/sea water intrusion and surface water salinization in Tianjin, the chemi- cal compositions of surface water were investigated. The results show that the chemical compositions of surface water vary obviously towards the coast. The high TDS contents of surface water samples show a significant salinization process. Meanwhile, the water quality transforms gradually from fresh water to brine water, accom- panied with the change of water chemical type from the HCO3-Ca type to the C1-Na type. According to the Gibbs graph analysis, chemical compositions of most water samples are evidently affected by the evaporation- condensation process. Moreover, cation-exchange and carbonate dissolution/precipitation induced by saline/sea water intrusion have also a strong impact on the chemical composition of surface water in Tianjin.