Lens (hydrology): Difference between revisions
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{{Other uses|Lens (disambiguation)}} |
{{Other uses|Lens (disambiguation)}} |
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In [[hydrology]] a '''lens''' is a convex layer of [[freshwater|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. <ref name=UGUAM>{{cite web|url=http://www.weriguam.org/docs/reports/120.pdf|title=An Atoll Freshwater Lens Algebraic Model for Groundwater Management in the Caroline slands|work=University of Guam, Water and Environmental Research Institute of the Western Pacific|author=Ryan T. Bailey, John W. Jenson, Arne E. Olsen|accessdate=2010-11-25|date=04-2008}}</ref><ref name=UNESCO>{{cite web|url=http://portal.unesco.org/fr/ev.php-URL_ID=13604&URL_DO=DO_TOPIC&URL_SECTION=201.html|work=United Nations Educational, Scientific and Cultural Organization|title=Freshwater lens|accessdate=2010-11-25}}</ref> |
In [[hydrology]] a '''lens''' is a convex layer of [[freshwater|fresh]] [[groundwater]] that floats on top of denser [[Seawater|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. <ref name=UGUAM>{{cite web|url=http://www.weriguam.org/docs/reports/120.pdf|title=An Atoll Freshwater Lens Algebraic Model for Groundwater Management in the Caroline slands|work=University of Guam, Water and Environmental Research Institute of the Western Pacific|author=Ryan T. Bailey, John W. Jenson, Arne E. Olsen|accessdate=2010-11-25|date=04-2008}}</ref><ref name=UNESCO>{{cite web|url=http://portal.unesco.org/fr/ev.php-URL_ID=13604&URL_DO=DO_TOPIC&URL_SECTION=201.html|work=United Nations Educational, Scientific and Cultural Organization|title=Freshwater lens|accessdate=2010-11-25}}</ref> |
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==References== |
==References== |
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Revision as of 20:58, 20 December 2010
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. [1][2]
References
- ^ Ryan T. Bailey, John W. Jenson, Arne E. Olsen (04-2008). "An Atoll Freshwater Lens Algebraic Model for Groundwater Management in the Caroline slands" (PDF). University of Guam, Water and Environmental Research Institute of the Western Pacific. Retrieved 2010-11-25.
{{cite web}}: Check date values in:|date=(help)CS1 maint: multiple names: authors list (link) - ^ "Freshwater lens". United Nations Educational, Scientific and Cultural Organization. Retrieved 2010-11-25.
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