对于咸淡水交互界面空间分布特征传统研究主要以室内模拟为主。为克服尺度效应和地层分布的非均质性，以威海市环翠区双岛镇西山村双岛港东北部为研究对象，从山前-滨海区选择一个典型剖面，在海水涨落的一个周期内，对地下水水位和水质进行观测，通过水化学分析结合多元统计等方法，精确刻画咸淡水界面的时空分布特征。结果表明，实验剖面上X5点处咸淡水界面以0.9 m埋深为中心、倒U字形入侵，垂向上位于埋深0.3~1.5 m之间，入侵强度为0.9 m > 0.6 m > 1.2 m > 1.5 m；咸淡水交互界面在重力作用下向下方短距离迁移，且呈现咸水入侵速度快，回淡速度慢的趋势；界面上水化学类型的变化主要表现为由重碳酸型水转换为氯化物型水的一个循环往复的过程。

In traditional research people mainly employed the laboratory simulation experiments to characterize the spatial distribution of interactive interface between salt and freshwater.However,these approaches did not take into account the scale effects and heterogeneity of stratum structure.To address these problems,a typical profile was selected from the piedmont plain to the alluvial coastal plain in the south part of Shandong Province.The water table and samples were collected from this profile within a cycle period of flood-ebb fluctuations,and the multivariate statistical analysis method was used to describe the spatial distribution of this interactive interface.The results indicated that the interactive interface distributed as an inverse U-shape and the burial depth was between 0.3 to 1.5 m vertically with the central point at the depth of 0.9 m at X5 point,and its intrusion intensity variance with depths was 0.9 m > 0.6 m > 1.2 m > 1.5 m.Under the condition of gravity activity the interactive interface migrated deep,showing a tendency of quicker saline-water intrusion and slower desalination.The groundwater type changed as an iterative process from bicarbonate type to chloride type in this interactive interface.