Numerical Hydrodynamics Study of Sacca di Goro Coastal Lagoon, Italian Northern Adriatic Sea

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D. Marinov ¹, José-Manuel Zaldívar ¹ and A. Norro² ¹ IES, Joint Research Center, EC, Ispra (VA), Italy ² MUMM, Inst. Regular Science, Brussels, Belgium 6-th ELOISE European Conference, Portoroz, 15-18 November 2004 Numerical Hydrodynamics Study of Sacca di Goro Coastal Lagoon, Italian Northern Adriatic Sea JRC – Ispra

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Contents: 1. Presentation 2. COHERENS demonstrate 3. Display comes about: Flow examples and Water surface rise Travelling/Propagation times Particle directions and Residence times Effect of new vast ocean association on temperature and saltiness Surface temperature and saltiness in 1992 (film) 4. Conclusions JRC – Ispra

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DITTY Project : Development of an Information Technology Tool for the Management of Southern European Lagoons affected by stream bowl overflow EVK3-CT-2002-00084 The target of the venture is to build up a logical base and data innovation apparatus for the supported and objective usage of the accessible assets in Southern European tidal ponds considering the effect of agribusiness, urban and monetary exercises. JRC – Ispra

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Introduction Length ~ 11 km, Width ~ 5 km, Area ~ 26 km ², Mean profundity ~ 1.5 m, Second enormous mollusks maker in Italy 8,000-15,000 tons/year Disruptions: full scale algal blossoms, anoxic emergencies, financial misfortunes. Sacca di Goro (Italy) Ulva expansion JRC – Ispra

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COHERENS is perplexing 3-D hydrodynamic limited distinction display for seaside oceans which is combined with natural and contaminant models JRC – Ispra

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Model Verification 1 Comparison of numerical outcomes for the water surface height and flow speed at the fundamental tidal pond ocean association (point 7) with estimations of Ciavola et al. (2000) gathered amid a spring occasion of high tide with sufficiency around 1m and NW twist of 4-6 m/s speed: (a) water surface rise; (b) ebb and flow speed Ciavola, P., Gonella, M., Tessari, U. furthermore, Zamariolo, A., 2000. In: L. Terrazzi (Editor), Studi Costieri 2, Firenze, pp.153-173 JRC – Ispra

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Model Verification 2 Comparison of numerical outcomes for the surface temperature and saltiness at the float station with hourly recurrence perceptions (Bencivelli, private correspondence) gathered amid 1992 year: (a) temperature; (b) saltiness JRC – Ispra

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Model Results 1 Flow examples and water surface height Investigations of stream examples and water surface rise in Sacca di Goro beach front tidal pond considering the impacts of the new simulated association with Adriatic Sea and considering diverse wind and tide driving conditions . JRC – Ispra

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Model Results 2 Traveling/Propagation times The performed numerical tests prove perfect outcomes for both tidal pond topologies. Surge tides - the normal voyaging times is around 35 min for the focal/western zone and ca. 45 min for the eastern zone . Ebb tides - the voyaging times for the distinctive areas of Sacca di Goro are roughly multiplied in examination with those for the flooding cases . JRC – Ispra

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Model Results 3 Water restoration and trade Investigations of molecule directions in Sacca di Goro beach front tidal pond considering the impacts of the new fake association with Adriatic Sea JRC – Ispra

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Model Results 4 Residence times The normal living arrangement times in 1992 for western piece of Sacca di Goro tidal pond are between 0.5-1 day . The watched for that year negligible home circumstances in this part are all together of 6-7 hours while the maximal ones territory to 2-4 days. The living arrangement times for the western piece of Sacca di Goro are less influenced by the opening of the new association with Adriatic ocean. The focal zone of Sacca di Goro can be describe in 1992 for non changed bathymetry with mean living arrangement time values 3-6 days , negligible habitation periods 12-13 hours and maximal living arrangement interims of request 10-24 days. On account of the changed bathymetry the living arrangement times for the southern focal part are expanded around 1.5-2 times. In the eastern piece of Sacca di Goro for non altered bathymetry amid 1992 the normal living arrangement times achieve values 7-18 days , the negligible living arrangement interims are 1-8 days yet the maximal ones change between 20-49 days. The dispatch of the new fake association lessens the living arrangement eras in the eastern part roughly 2 times. JRC – Ispra

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Model Results 5 Effect of new association on temperature and saltiness handle The additional mouth changes the temperature and saltiness fields in the eastern and focal parts of the tidal pond since it enhances the water trade with the untamed ocean. No genuine impact on temperature and saltiness in the western piece of Sacca di Goro was found. When all is said in done the new association produces into the influenced zones an expansion of the temperature of the tidal pond's water amid the winter and its decrease amid whatever remains of the year . The water saltiness indicates higher values in the circumstance with the new channel. It was found that the considered generally little changes of the south-eastern fringe of the tidal pond can prompt to varieties of range 10-20% for the temperature and saltiness fields into Sacca di Goro. JRC – Ispra

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Conclusions: The fundamental result of this piece of DITTY venture is that aligned and confirmed 3-D hydrodynamic model for waterfront tidal ponds has been work out. The model was effectively connected for examination an Italian Adriatic Sea beach front tidal pond which is of extraordinary intrigue. The following stride of our work will couple the hydrodynamic model with organic and contaminants destiny models. Damage Menor (Spain) JRC – Ispra

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Surface Temperatures in 1992 (month to month elements) for Sacca di Goro Coastal Lagoon JRC – Ispra

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Surface Salinity in 1992 (month to month progression) for Sacca di Goro Coastal Lagoon JRC – Ispra

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