Measurement of Submarine Groundwater discharge and Associated Contaminants into the Venice Lagoon, Italy (Abstract/Comunicazione in atti di convegno)

Type
Label
  • Measurement of Submarine Groundwater discharge and Associated Contaminants into the Venice Lagoon, Italy (Abstract/Comunicazione in atti di convegno) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Alternative label
  • J. Rapaglia (1), H. Bokuniewicz (1), L. Zaggia (2), F. Collavini (2), P. Masque (3), E. Garcia-Solsona (3), G.M. Zuppi (4), J.K. Cochran (1), A. Beck (1) (2005)
    Measurement of Submarine Groundwater discharge and Associated Contaminants into the Venice Lagoon, Italy
    in LOICZ-II Inaugural Open Science Meeting, Egmond aan Zee, Netherlands, 27-29 June 2005
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • J. Rapaglia (1), H. Bokuniewicz (1), L. Zaggia (2), F. Collavini (2), P. Masque (3), E. Garcia-Solsona (3), G.M. Zuppi (4), J.K. Cochran (1), A. Beck (1) (literal)
Pagina inizio
  • 124 (literal)
Pagina fine
  • 125 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume
  • Coast and Coastal People Scenarios of Change and Responses, LOICZ-II Inaugural Open Science Meeting (literal)
Note
  • Abstract (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1) Marine Sciences Research Center, Stony Brook University (MSRC-SBU), Stony Brook, NY, USA 2) Consiglio Nazionale delle Ricerche, Istituto di Scienze Marine (CNR-ISMAR), Venice, Italy 3) Institut de Ciència i Tecnologia Ambientals, Universitst Autonoma de Barcelona (ICTA-UAB), Bellaterra, Spain 4) Dipartimento di Scienze Ambientali, Università Cà Foscari di Venezia, Venice, Italy (literal)
Titolo
  • Measurement of Submarine Groundwater discharge and Associated Contaminants into the Venice Lagoon, Italy (literal)
Abstract
  • The first set of submarine groundwater discharge (SGD) measurements was made in the Venice Lagoon in order to complete the hydrological budget of the lagoon's drainage basin. The Venice Lagoon is a 550 km2 shallow water body (average depth of 100 cm), which is connected to the Adriatic Sea by three inlets (Figure 1 ). It sits atop a series of nine unconsolidated or semi-consolidated ·aquifers with a total thickness of about 1000 meters. Though the surrounding land is of low relief, and therefore unlikely to support any substantial, water-table hydraulic gradient, freeflowing artesian wells are found. Two hundred SGD measurements were taken using benthic chambers vented to plastic bags in a pristine northern lagoon site (Isola la Cura) showing flow rates as high as 200 cm3 cm-2 d-1 with an average of 30 cm d-1. While over 100 measurements were taken adjacent to a bulkheaded shoreline by the southern canal of the Porto Marghera industrial zone (Fusina site) which showed flow rates as high as 30 cm d-1, averaging 6 cm d-1. These rates were much greater than expected considering the characteristics of the study site. Integrated measurements of radium isotopes supported the data collected with the manual seepage devices. Flow rates of this magnitude, if representative of even a fraction of the lagoon floor, can easily account for a significant proportion of the overall freshwater balance of the Venice Lagoon, whose surface-water yield averages 35.5 m3/s. Groundwater flowing into the lagoon is driven by the circulation of porewater through marshes augmented with groundwater driven across the sea floor from deeper artesian aquifers in the Isola la Cura site, whereas it is driven by the hydraulic gradient supported by the bulkheaded shoreline at Fusina. In addition to being a significant source of terrestrial based water in the Lagoon, SGD may provide tlw major pathway for certain contaminants to enter the Lagoonal system as the concentrations of many compounds (e.g. nutrients) are often much higher in groundwater than in seawater. Water samples were collected for analysis in both lagoon sites to test whether SGD could be the primary source for nutrients to enter the lagoon. Ammonium concentration was found to be 2 to 8 fold higher in the device water than in the lagoon water at the Isola la Cura site, dependent on season and 10-30 times higher at the Fusina site. The primary goal of the investigation is to determine the significance of the SGD flux on both the hydrological and chemical budget of the lagoon, especially the role of SGD as a pathway for nutrients to enter the system. This coincides with the fourth theme of this meeting involving budgeting methodologies in coastal waters. In addition the comparison between the pristine northern lagoon site and the industrial site has shed some light on the anthropogenic influence on the water quality of the SGD which enters the lagoon, as well as the role that anthropogenic modifications have on the general SGD signature, which coincides with themes three and five. (literal)
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