Behaviour and fate of urban particles in coastal waters: settling rate, size distribution and metals contamination characterization

Oursel, Benjamin; Garnier, Cédric; Pairaud, Ivane; Omanović, Dario; Durrieu, Gaël; Syakti, Agung Dhamar; Le Poupon, Christophe; Thouvenin, Bénédicte; Lucas, Yves (2014) Behaviour and fate of urban particles in coastal waters: settling rate, size distribution and metals contamination characterization. Estuarine, Coastal and Shelf Science, 138 . pp. 14-26. ISSN 0272-7714

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Abstract

The evaluation of contaminant net fluxes from the coast to the open sea requires the study of terrigeneous particles behaviour and fate. We studied the particles issued from two small coastal rivers whose waters are mixed with treated wastewater (TWW) coming from the Marseille wastewater treatment plant (WWTP) just before discharge to the Mediterranean Sea. An experimental device was developed and used to investigate particles settling rates, size distribution and metallic contamination when mixing with seawater. The particles were sampled in flood deposits of rivers and outlets during rainy periods and in the outlet water during dry periods. The flood deposits were mainly composed of 50–200 μm-sized particles, higher metals content being observed in the finest fractions. Dry period particles showed the stronger influence of wastewater inputs. Al, Ca, Cs, Li, Rb, Ti, and Tl were mainly of terrigeneous origin, whereas Ag, Ba, Cd, Cr, Cu, Hg, Mg, Mo, Ni, Pb, POC, Sb, Sn and Zn were of anthropogenic origin, issued from non-treated sewage, TWW or industrial waste. In seafloor sediments, all metals exhibited a continuous increase of concentration from the outlet to, at least, 800 m offshore. Implementation of settling particles characteristics in a 3D hydrodynamic and sediment transport model reproduced well the observed deposition of polluted particles in the coastal zone and indicated a non-negligible offshore export of the finest particles and their accompanying pollutants.

Item Type:	Article
Uncontrolled Keywords:	particles contamination; urban rivers; coastal zone; TWW; hydro sedimentation modelling
Subjects:	NATURAL SCIENCES > Chemistry
Divisions:	Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type ANR CES MARSECO UNSPECIFIED UNSPECIFIED UNSPECIFIED GIRAC-PACA project UNSPECIFIED UNSPECIFIED UNSPECIFIED FUI project UNSPECIFIED UNSPECIFIED UNSPECIFIED TPM project UNSPECIFIED UNSPECIFIED UNSPECIFIED Region Provence Alpes COte d'Azur project UNSPECIFIED UNSPECIFIED UNSPECIFIED "MerMex-WP3-C3A" project UNSPECIFIED UNSPECIFIED UNSPECIFIED METROC project UNSPECIFIED UNSPECIFIED UNSPECIFIED EC2CO MASSILIA project UNSPECIFIED UNSPECIFIED UNSPECIFIED MerMex-WP3-C3A project UNSPECIFIED UNSPECIFIED UNSPECIFIED PERSEUS FP7 project UNSPECIFIED UNSPECIFIED UNSPECIFIED international "IMBER" project UNSPECIFIED UNSPECIFIED UNSPECIFIED
Depositing User:	Dario Omanović
Date Deposited:	19 Dec 2016 15:11
URI:	http://fulir.irb.hr/id/eprint/1600
DOI:	10.1016/j.ecss.2013.12.002

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