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Lens (hydrology) : ウィキペディア英語版
Lens (hydrology)

In hydrology a lens is a convex layer of fresh groundwater that floats on top of denser saltwater. It arises when rainwater seeps down through a soil surface and then gathers over a layer of seawater at or down to about five feet below sealevel. Freshwater lenses are often found on small coral or limestone islands and atolls, where wells dug into them may be the only natural source of potable water.〔(【引用サイトリンク】work=United Nations Educational, Scientific and Cultural Organization )
Ghyben-Herzberg lenses are a simple model of the process.
==References==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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