Temporal variations of water flow between the Venetian lagoon and the open sea

Gačić, Miroslav; Mancero-Mosquera, Isaac; Kovačević, Vedrana; Mazzoldi, A.; Cardín, Vanessa; Arena, F.; Gelsi, Giorgio

doi:10.1016/j.jmarsys.2004.05.025

Cited by 55 publications

(29 citation statements)

References 15 publications

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“…Additionally, it has to be said that the meteorological data time step, 6 h, could introduce some artificial frequencies in the model results and that could explain the peak around 3.2E-4 Hz in the model data. These results could be interfaced with other studies done on residual currents at the Venice Lagoon inlets from ADCP data (Gačić et al 2004). In Gačić et al (2004), the seiches signals can be isolated and the obtained information is comparable with the one from our study, even if the analysis has been done on axial velocities and not on fluxes as done here.…”

Section: Residual Levels and Fluxessupporting

confidence: 78%

“…About 100 ship-borne ADCP surveys were conducted to estimate the water inflow and outflow through each inlet both during spring and neap tide. Comparing the discharge results with the average velocity collected by the bottom mounted ADCP for the same period, the parameters of a linear correlation function have been calculated (Gačić et al 2004). Therefore, the flow rate is available every 10 min applying the calculated linear regression formula to the vertically integrated measured current values (Gačić et al 2002).…”

Section: The Flow Rate Adcp Datamentioning

confidence: 99%

“…From the evidence of measurements at the inlets, it can be deduced that the flow acceleration is generated by the pressure gradient due to the sea level slope. Velocities are of the order of 1 m/s and the bottom friction term is balanced by the local acceleration and the horizontal pressure gradient (Gačić et al 2004). The wind action is mainly barotropic at the inlets (Gačić et al 2002).…”

Section: Flux Data Validationmentioning

confidence: 99%

“…The wind action is mainly barotropic at the inlets (Gačić et al 2002). The conjunction of tidal cycles and atmospheric pressure and wind produces extreme events propagating into the lagoon from the inlets, in particular when SE wind (Scirocco) is blowing in a low pressure configuration (generally in winter time; Gačić et al 2004).…”

Section: Flux Data Validationmentioning

confidence: 99%

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Modeling the water exchanges between the Venice Lagoon and the Adriatic Sea

2008

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A hydrodynamic model of the Venice Lagoon and the Adriatic Sea has been developed in order to study the exchanges at the inlets of the Venice Lagoon, a complex morphological area connecting the sea and the lagoon. The model solves the shallow water equations on a spatial domain discretized by a staggered finite element grid. The grid represents the Adriatic Sea and the Venice Lagoon with different spatial resolutions varying from 30 m for the smallest channels of the lagoon to 30 km for the inner areas of the central Adriatic Sea. Data from more than ten tide gauges displaced in the Adriatic Sea have been used in the calibration of the simulated water levels. After the calibration, the tidal wave propagation in the North Adriatic and in the Venice Lagoon is well reproduced by the model. To validate the model results, empirical flux data measured by acoustic Doppler current profiler probes installed inside the inlets of Lido and Malamocco have been used and the exchanges through the three inlets of the Venice Lagoon have been analyzed. The comparison between modeled and measured fluxes at the inlets outlines the efficiency of the model to reproduce both tide-and wind-induced water exchanges between the sea and the lagoon. Even in complex areas, where highly varying resolution is needed, the model is suitable for the simulation of the dominating physical processes.

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Section: Residual Levels and Fluxessupporting

confidence: 78%

Section: The Flow Rate Adcp Datamentioning

confidence: 99%

Section: Flux Data Validationmentioning

confidence: 99%

Section: Flux Data Validationmentioning

confidence: 99%

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Modeling the water exchanges between the Venice Lagoon and the Adriatic Sea

2008

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“…It is connected with the Adriatic Sea by three inlets (Lido, Malamocco, Chioggia), permitting water and sediment exchan ge driven by the tidal cycle (Ghetti, 1974). The average water volume is approximately 390 x 10 6 m 3 , and the amount of salt water that flows in and out during each tidal cycle amounts to around one-third of the total volume of the Lagoon (Gačić et al, 2004).…”

Section: Study Areamentioning

confidence: 99%

Links between hydrology and sedimentology in the Lagoon of Venice, Italy

Molinaroli

Guerzoni

Sarretta

et al. 2007

Journal of Marine Systems

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A textural classification of sediments collected in input channels, shallow lagoon beds and navigation channels of the Lagoon of Venice is presented. Some variables describing both the hydrodynamics and the transport time scales of the Lagoon are compared with bottom sediment distribution inside the basin. A high correlation between residence time (REST) and the silt fraction (4-31 µm) was only found for REST values < 20 days. A good correlation was also found between root mean square velocity (RMSV) and the fine sand fraction (63-105 µm) for RSMV > 10 cms -1 . The distribution of the various sediment types was explained by the use of PCA applied to both grain-size and hydrological parameters, which extracted two principal factors and formed four groups of clustered samples. Groups 1 (clayey silt) and 2 (very silty slightly sandy mud) comprise samples located mainly in the northern and central lagoon and inshore. The samples of group 3 (very silty sandy mud) seem to show stabilisation, reflected in the reduction of sand and the sedimentation of silt with respect to samples in group 4 (slightly silty sand), some of which were collected on a previous seagrass bed which has now disappeared and/or been reduced in size.

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Comparative hydrodynamics of 10 Mediterranean lagoons by means of numerical modeling

Umgiesser

Ferrarin

Cucco

et al. 2014

J. Geophys. Res. Oceans

178

135

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A comparison study between 10 Mediterranean lagoons has been carried out by means of the 3-D numerical model SHYFEM. The investigated basins are the Venice and Marano-Grado lagoons in the Northern Adriatic Sea, the Lesina and Varano lagoons in the Southern Adriatic Sea, the Taranto basin in the Ionian Sea, the Cabras Lagoon in Sardinia, the Ganzirri and Faro lagoons in Sicily, the Mar Menor in Spain, and the Nador Lagoon in Morocco. This study has been focused on hydrodynamics in terms of exchange rates, transport time scale, and mixing. Water exchange depends mainly on the inlet shape and tidal range, but also on the wind regimes in the case of multi-inlet lagoons. Water renewal time, which is mostly determined by the exchange rate, is a powerful concept that allows lagoons to be characterized with a time scale. In the case of the studied lagoons, the renewal time ranged from few days in the Marano-Grado Lagoon up to 1 year in the case of the Mar Menor. The analysis of the renewal time frequency distribution allows identifying subbasins. The numerical study proved to be a useful tool for the intercomparison and classification of the lagoons. These environments range from a leaky type to a choked type of lagoons and give a representative picture of the lagoons situated around the Mediterranean basin. Mixing efficiency turns out to be a function of the morphological complexity, but also of the forcings acting on the system.

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Temporal variations of water flow between the Venetian lagoon and the open sea

Cited by 55 publications

References 15 publications

Modeling the water exchanges between the Venice Lagoon and the Adriatic Sea

Modeling the water exchanges between the Venice Lagoon and the Adriatic Sea

Links between hydrology and sedimentology in the Lagoon of Venice, Italy

Comparative hydrodynamics of 10 Mediterranean lagoons by means of numerical modeling

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