M.O.S.E. -MOdello Sperimentale Elletromecanico – Electromecanic experimental model .
Mose is a part of the General Plan of Measures for the Protection of Venice and its lagoon ,within the framework of the Special Law for Venice defined as a result of high tide (November 4, 1966) .http://dipoco.altervista.org/venice-acqua-alta-high-water/
Is a system of barrages who defending Venice and the lagoons from high waters, which become more frequent and intense .The recent estimates predict rise of the a sea level in the next 100 years, in a range between 18 and 59 cm.
The dams are formed by a series of gates that normally remain on the bottom of the mouth of the harbor completely invisible. In case of danger , the gates are raised so as to isolate the lagoon from the sea.Is one of the most important hydraulic engineering works ever realized , able to protect against a flood of up to three meters , the result of an international system of techno scientific exchanges with leading universities, research centers and major engineering company .
Before the construction, large surveys were carried out to detect underwater archaeological sites and to find war remnants.
The dockyard , active simultaneously in all three inlets , began to work in 2003 and the works are in a very advanced stage. Were subtracted from the lagoon bottom ,5 million cubic meters of mud ,and replaced with concrete caissons .In addition to the activities at the inlets is proceeding with the construction of the main components: the gates and the hinges .The hinges represent the technological heart of the barriers , blocking the floodgates to their place, allowing the movement and providing the functional connection with the operation .There are made of a “male” element ( height 3 m, weight 10 tons ) connected to the gate , a “female” element ( height 1.5 m, weight 25 tons ) bound to the body of the caisson, and the group of the “coupling piece” that joins the male and female to form the hinge. Will be made 156 hinges (two for each gate ), attentively controlled because the failure of one of the hinges can lead to tragic events in Venice, such as floods and tsunamis .
The Mose will be provided also with some basins ,and flood gates used to enter and exit the ships when the gates are raised. All the sistem become active when the forecasting system on the high seas predict tides higher than +110 cm which starts the mechanism and the gates will be raised (in 30 minutes).When the tide level decreases , the time of closing of the gates is 4 hours adn 30 minutes.
The defend of the average basis tides will be left to the so called “local defense system “, the rising of the urban pavement .
In 2014 will be completed the construction of both the barriers of the Lido inlet , at the same time , will proceed the positioning of the caissons at the inlets of Malamocco and Chioggia harbour, and then installing the gates and complete the system Mose in 2016.
In parallel was started the renovation and the equip of the space for the future maintenance . Arsenale, (http://dipoco.altervista.org/109/ ) the symbol of Serenissima republic of Venice, will be the head of the Mose’s control and maintenance and the management of the lagoon system. A delicate problem will be the maintenance of the gates ( every five years ,will be need to lift and remove the gates from their home to clean the external and internal accumulation and biofouling , painting them and other tasks that can not be made ” on the spot ” .
The main ( of the various) critics of the “anti Mose ” ;in addition to high costs ( have been allocated 4.987 billion euro for the construction of the dams ) is the problem of the physical protection of the laguna environment. If the most important problem was the erosion of the bottom of the inlets , caused by excessive functionality of these ,leading to an increased entry of sea water , according to the criticism ,Mose not only would not stop the phenomenon, but would impede any possible further action due to the overbuilding of the backdrops set at 15 meters depth (if erosion will down below this depth ) .Over the years, were presented nine appeals, which challenged the construction .The last one demanded appropriate steps to avoid pollution or deterioration of the birds habitats or any disturbances who affecting their life .
On the future, Mose, will be an attraction for visitors and tourists. The new design of the territory, the redevelopment of the shoreline through a series of services for public use , as docks and protected anchorages, green areas with trees, “squares of water”, pedestrian and cycle paths and scenic spots like raised terraces from where you can see the sea ,the boats and, if you are fortunate …the dams.
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