A continuous monitoring over time of the variations of the astronomical tidal amplitude allows to highlight the hydrodynamic and therefore morphological changes inside the Venice Lagoon, which owes its survival to the maintenance of delicate environmental balances. The width of the tide in the lagoon is compared with the characteristic one of the Gulf of Venice, belonging to the same area from a geological point of view, but exempt from the anthropic intervention that distinguishes the transition environment considered. The tidal height trend is now substantially stable throughout the lagoon, after the strong variations observed as a result of profound changes introduced to the lagoon morphology during the first decade of the century.

A continuous monitoring over time of changes in the delay in the propagation of the astronomical tide allows to highlight the hydrodynamic and therefore morphological changes inside the Lagoon of Venice, which owes its survival to the maintenance of delicate environmental balances. The tidal propagation delays within the lagoon are calculated with respect to the Gulf of Venice, belonging to the same area from a geological point of view, but exempt from the anthropic intervention that distinguishes the lagoon environment considered. Tidal propagation delays are greater the greater the distance of the observation point from the port mouth from which it is fed. The tidal wave takes about 35/40 minutes to enter the lagoon through the narrowing of the three port mouths, while it takes about three hours to reach the most inland and remote areas.