%0 Book Section
%9 OS CH : Chapitres d'ouvrages scientifiques
%A Chouba, C.
%A Delpoux, S.
%A Causse, L.
%A Marie, M.
%A Freydier, R.
%A Toubiana, M.
%A Monfort, P.
%A Pringault, Olivier
%A Montigny, C.
%T Status of water quality and impact of dredging activities in four ports of the gulf of Aigues Mortes (France)
%B Ninth International Symposium "Monitoring of Mediterranean coastal areas : problems and measurement techniques"
%C Florence
%D 2022
%E Bonora, L.(ed.)
%E Carboni, D.
%E De Vincenzi, M.
%E Matteucci, G.
%L fdi:010086204
%G ENG
%I Firenze University Press
%@ 979-12-215-0030-1 
%K FRANCE
%P 416-425
%R 10.36253/979-12-215-0030-1.37
%U https://www.documentation.ird.fr/hor/fdi:010086204
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2024-12/010086204.pdf
%W Horizon (IRD)
%X Coastal hydrosystems, located at the land-sea interface, are both subject to autochthonous sources of pollution but also form a receptacle for terrigenous inputs from upstream areas.The Gulf of Aigues Mortes (GAM) extends along the western margin of the Rhone delta. The marinas spread over this restricted geographical area present variable management problems depending on their size and location. Due to silting and/or siltation phenomena, the situation is becoming increasingly difficult to manage to maintain the depths of most ports. In these marinas that are not dredged regularly, the quantities of potentially contaminated sediments (organic and metallic micro-pollutants) to be extracted represent from a few thousand to several tens of thousands of m3 of sediments on the scale of each port.








Four ports of the GAM have joined together to set up a mutualized dredging project based on the valorization of dredged sediments. The objective of this work is to carry out a diagnosis of the chemical and microbiological contamination of the waters of the 4 ports located in the Gulf of Aigues Mortes. Regular water sampling was done before, during and after dredging operations. Water column quality/contamination was characterized by major physicochemical water parameters, trace metallic elements and organotin compounds. In addition to chemical parameters, indicators of faecal contamination were also monitoring. Dredging operations have induced the resuspension and/or readsorption on suspended matter of trace metal elements and organotin compounds in the water column. A significant increase in the concentrations of As (enrichment factors ranging from 1.2 to 2.15 times the postdredging values) inducing exceedance of the EQS was observed. The behavior of copper and zinc is different according to the ports studied and during dredging operations. The resuspension of sediments, constituting both a sink and a source for (organo)metallic compounds, generated modifications of physico-chemical conditions and favoured increasing or decreasing of chemical elements concentrations observed in the dissolved fraction of the water column. These resuspensions are themselves related to the nature of the dredged sediments.
%B International Symposium 
%8 2022/06/14-16
%$ 021 ; 032 ; 038