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Old May 18th 09, 12:38 AM posted to sci.environment,sci.geo.meteorology,sci.energy
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Default Sea level essentially unchanged … yawn



Bret Cahill wrote:

How about Venice, Italy? It has been completely
submerged by the melting ice caps, right? No?


The Italians are so concerned about rising sea levels they are working
on a water gate to control high tides.


Using the right words, I assume you mean Venice.

There's a reason for that. Venice is sinking. The sea level is currently
reducing.
http://en.wikipedia.org/wiki/Venice#Sinking_of_Venice

"The buildings of Venice are constructed on closely spaced wood piles,
which were imported from the mainland. (Under water, in the absence of
oxygen, wood does not decay. It is petrified as a result of the constant
flow of mineral-rich water around and through it, so that it becomes a
stone-like structure.) The piles penetrate a softer layer of sand and mud
until they reach the much harder layer of compressed clay. Wood for piles
was cut in the most western part of today's Slovenia, resulting in the
barren land in a region today called Kras, and in two regions of Croatia,
Lika and Gorski kotar (resulting in the barren slopes of Velebit). Most of
these piles are still intact after centuries of submersion. The
foundations rest on the piles, and buildings of brick or stone sit above
these footings. The buildings are often threatened by flood tides pushing
in from the Adriatic between autumn and early spring.

Six hundred years ago, Venetians protected themselves from land-based
attacks by diverting all the major rivers flowing into the lagoon and thus
preventing sediment from filling the area around the city. This created an
ever-deeper lagoon environment.

During the 20th century, when many artesian wells were sunk into the
periphery of the lagoon to draw water for local industry, Venice began to
subside. It was realized that extraction of the aquifer was the cause.
This sinking process has slowed markedly since artesian wells were banned
in the 1960s. However, the city is still threatened by more frequent
low-level floods (so-called Acqua alta, "high water") that creep to a
height of several centimeters over its quays, regularly following certain
tides. In many old houses the former staircases used by people to unload
goods are now flooded, rendering the former ground floor uninhabitable.
Many Venetians have resorted to moving up to the upper floors and
continuing with their lives."

Graham




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