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为了判明某滨海城市入侵海水的来源 ,对其沿海典型地段进行地下水取样 ,通过对所取水样的主要离子和同位素的分析 ,绘制了地下水中主要阴阳离子与氯离子浓度间的双变量图。主要阴阳离子与氯离子的相关性说明了研究区地下水化学成份中的变化主要是由于海水与地下淡水混合引起的离子交换造成的 ,同时Br- Cl- 的比值说明了入侵咸水来自于现代海水 ,氢、氧同位素的关系也说明了研究区地下咸水是由于海水和淡水的混合形成。
In order to find out the source of intrusion seawater in a coastal city, groundwater samples were taken from the typical coastal areas. Based on the analysis of the main ions and isotopes of the samples taken, the bivariate maps of the main anion and chloride ion concentrations in groundwater were drawn. The correlation between the main anion and chloride ions indicates that the changes in the chemical composition of groundwater in the study area are mainly caused by the ion exchange caused by the mixture of seawater and fresh groundwater and the Br-Cl- ratio indicates that the invasion saltwater comes from the modern seawater The relationship between hydrogen and oxygen isotopes also shows that the saline water in the study area is formed by the mixture of seawater and freshwater.