Anthropogenic contaminants in Venice Lagoon sediments and their pore fluids: Results from the SIOSED Project
Anthropogenic contaminants in Venice Lagoon sediments and their pore fluids: Results from the SIOSED Project
Investigations of sediment geochemistry and interstitial water chemistry during SIOSED (Scripps Institution of Oceanography Sediment Research Project) revealed information about the characteristics and depth range of contamination in sediments associated with dredging operations in the Venice Lagoon, Italy. Results from gravity cores indicate that contamination ranges larger and deeper in sediments associated with Porto Marghera and the Venice Industrial Zone compared with sediments at greater distances from dredged shipping canals or pollution sources. The effects of sediment re-deposition were evaluated from a pore water chemistry study of artificial banks constructed by placing dredged canal sediments on top of background sediments. Rapid decreases in dissolved sulfate associated with increases in alkalinity, sulfide, and nutrients, such as ammonium and phosphate, indicate that sediment dredging led to enhanced bio-chemical diagenesis of organic matter near the surface of the re-deposited sediments. Continued diagenesis of organic matter in re-deposited sediments maintained extrema in alkalinity, dissolved sulfate, sulfide, and ammonium. The artificial banks retained their pore water signatures over the duration of the project. Sediment redistribution can thus cause important changes in pore water profiles, as observed from the chemistry in long cores studied in this program.
Sediment studies in Venice Lagoon, Pore water geochemistry, Sediment geochemistry, Artificial banks constructed from dredged canal sediments
73-84
Gieskes, Joris M.
abe17798-ef83-4f0a-bd1e-359fa2dfa54b
Han, Seunghee
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Rathburn, Anthony
420b9324-86a6-469e-aa86-a635f74f0936
Rothwell, Guy
fe473057-bf44-46d1-8add-88060037beb5
Pérez, M. Elena
4be1fd7f-3812-4236-ae91-2c46bc2fd9ab
Porrachia, Magali
32d274dd-99f3-4ce3-ab29-cfed0a1bf239
Barbanti, Andrea
ee662095-0718-46da-b845-c719c97f28c5
Deheyn, Dimitri D.
427026ce-5987-4b14-a52c-3209c64bda02
20 August 2015
Gieskes, Joris M.
abe17798-ef83-4f0a-bd1e-359fa2dfa54b
Han, Seunghee
e862a2c4-0f6b-4670-a1ce-f4f37b78461b
Rathburn, Anthony
420b9324-86a6-469e-aa86-a635f74f0936
Rothwell, Guy
fe473057-bf44-46d1-8add-88060037beb5
Pérez, M. Elena
4be1fd7f-3812-4236-ae91-2c46bc2fd9ab
Porrachia, Magali
32d274dd-99f3-4ce3-ab29-cfed0a1bf239
Barbanti, Andrea
ee662095-0718-46da-b845-c719c97f28c5
Deheyn, Dimitri D.
427026ce-5987-4b14-a52c-3209c64bda02
Gieskes, Joris M., Han, Seunghee, Rathburn, Anthony, Rothwell, Guy, Pérez, M. Elena, Porrachia, Magali, Barbanti, Andrea and Deheyn, Dimitri D.
(2015)
Anthropogenic contaminants in Venice Lagoon sediments and their pore fluids: Results from the SIOSED Project.
Marine Chemistry, 174, .
(doi:10.1016/j.marchem.2015.05.008).
Abstract
Investigations of sediment geochemistry and interstitial water chemistry during SIOSED (Scripps Institution of Oceanography Sediment Research Project) revealed information about the characteristics and depth range of contamination in sediments associated with dredging operations in the Venice Lagoon, Italy. Results from gravity cores indicate that contamination ranges larger and deeper in sediments associated with Porto Marghera and the Venice Industrial Zone compared with sediments at greater distances from dredged shipping canals or pollution sources. The effects of sediment re-deposition were evaluated from a pore water chemistry study of artificial banks constructed by placing dredged canal sediments on top of background sediments. Rapid decreases in dissolved sulfate associated with increases in alkalinity, sulfide, and nutrients, such as ammonium and phosphate, indicate that sediment dredging led to enhanced bio-chemical diagenesis of organic matter near the surface of the re-deposited sediments. Continued diagenesis of organic matter in re-deposited sediments maintained extrema in alkalinity, dissolved sulfate, sulfide, and ammonium. The artificial banks retained their pore water signatures over the duration of the project. Sediment redistribution can thus cause important changes in pore water profiles, as observed from the chemistry in long cores studied in this program.
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Published date: 20 August 2015
Keywords:
Sediment studies in Venice Lagoon, Pore water geochemistry, Sediment geochemistry, Artificial banks constructed from dredged canal sediments
Organisations:
National Oceanography Centre
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Local EPrints ID: 379680
URI: http://eprints.soton.ac.uk/id/eprint/379680
ISSN: 0304-4203
PURE UUID: 1827846a-4046-44bb-a0a8-c3c4d16aafcc
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Date deposited: 27 Jul 2015 09:52
Last modified: 14 Mar 2024 20:46
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Author:
Joris M. Gieskes
Author:
Seunghee Han
Author:
Anthony Rathburn
Author:
Guy Rothwell
Author:
M. Elena Pérez
Author:
Magali Porrachia
Author:
Andrea Barbanti
Author:
Dimitri D. Deheyn
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