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海岛及近岸带地下水是在海洋与陆地（岩石介质）的共同影响下形成的。天然条件下，海岛及近岸带低矿化地下水中Ｃｌ－含量较高，且Ｃｌ－与矿化度之间不存在内陆地区的统计线性关系。海洋对地下水的另一个影响是在海水入侵区，由于混合作用、阳离子交替吸附作用等使近岸带地下水水质在宏观上呈现出特殊的演化特征。
The island and nearshore groundwater is formed under the combined influence of ocean and land (rock media). Under natural conditions, there is a high Cl- content in the low mineralized groundwater in the islands and coastal zones, and there is no statistical linear relationship between Cl- and salinity in the inland areas. Another effect of the ocean on groundwater is that in the seawater intrusion zone, the groundwater quality in the nearshore zone shows special evolutionary characteristics in the macroscopic level due to the mixing effect and the alternating adsorption of cations.