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Name: Merritt
Status: Other
Age: 13
Location: N/A
Country: N/A
Date: N/A 


Question:
Is the Ghyben-Herzberg lens specific to islands? Could you tell me a bit about it too?



Replies:
Merritt,

A search for ghyben-herzberg on the internet will give you some references. One good explanation is at

www.geography.about.com/science/geography/library/misc/ucghyben.htm.

Although the lens effect may be most applicable on islands, a similar effect is seen along sea coastlines, as well as some places inland (particularly Florida, but I know of a location in western Pennsylvania also) where a source of salt, and therefore saltwater, or saltwater itself (even though many miles from the ocean) is found underground, under the freshwater aquifer. In any case, removal of freshwater at a rate that exceeds precipitation's contribution to the freshwater aquifer will result in intrusion of saltwater into the freshwater aquifer, an undesirable result, especially when it is being used as a supply of drinking water.

David Cook
Argonne National Laboratory



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