Venezia Tourist guides - Venice and the High Water phenomenon - Whether to sleep and room prices in Venezia
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Venice and the High Water phenomenon Stefano Secchi - Video by oSvideoo
By the time of high water are shown in the Venice lagoon tidal peaks particularly pronounced, likely to cause flooding in the urban area. The phenomenon is particularly frequent in autumn and spring, when high tide comes to flood a large part of the city making it difficult to travel lanes and fields.
The phenomenon of high is generated by the combination of two main factors: an astronomical setting up the regular alternation of the tides and weather because the wave of the storm (storm surge in English), made from a combination of wind and pressure marine atmospheric mass and the high tide by itself does not generate the high water, is the wave of storms that combined with the astronomical tide brings the water level to rise above normal levels and so much less predictable. The rise of water above the level of the tide is a normal phenomenon in a closed basin such as the Adriatic sea and the wind that promotes not only the common Bora in Venice but the Scirocco acting in the longitudinal direction over the entire mass d ' dell'Adriatico water [19]. The opening of the mouths of the port, increasing the channels of exchange of water between lagoon and sea, has amplified the phenomenon that in the past was an extraordinary event for the city. Numerous works of burial of parts of the lagoon (eg for the realization of Porto Marghera, or dell'Isola Tronchetto have reduced the volume of water and then modified invasive behavior of the tides.
If there is "high water", the city has a warning system capable of informing the residents well in advance through phone calls and sirens, to enable the necessary time to tackle the event. In periods of greater frequency of the phenomenon by the City is running a system of walkways, or wooden planks supported on steel supports that create paths "dry" along the major routes of the city. These media are guaranteed up to a tidal level of +120 cm, beyond which are removed as some sections of "bridges" starts to float. When the water exceeds +95 cm some shipping lines are limited public and / or diverted, as the media are no longer able to pass under the Bridge of the spire, the Ponte dei Tre Archi bridge and the railway that bypasses the Scomenzera channel. If the tide reaches higher levels, there are further reductions of service, up to total due to the boat, or floating pontoons which are the stops.
In order to counter the phenomenon of high, since 2003 is in progress the Mose project with the intention of the designers that will reduce high water thanks to movable barriers consist of a variable number of sluice gates anchored to the bottom of the mouths delivery of the lagoon, which will be made to emerge in case of need through a pneumatic system that entering the air and expelling the water will float by using the principle of Archimedes.