TY - JOUR T1 - Unexpected spatial impact of treatment plant discharges induced by episodic hydrodynamic events: Modelling Lagrangian transport of fine particles by Northern Current intrusions in the bays of Marseille (France) A1 - Millet,Bertrand A1 - Pinazo,Christel A1 - Banaru,Daniela A1 - Pages,Remi A1 - Guiart,Pierre A1 - Pairaud,Ivane AD - Aix Marseille Univ, CNRS, Mediterranean Inst Oceanog UM 110, IRD, Campus Luminy, Marseille, France. AD - Univ Toulon & Var, CNRS, Mediterranean Inst Oceanog UM 110, IRD, La Garde, France. AD - Inst Francais Rech Exploitat Mer, Lab Environm Ressources Prov Azur Corse, La Seyne Sur Mer, France. AD - Inst Francais Rech Exploitat Mer, Lab DYNECO DHYSED, Plouzane, France. UR - https://archimer.ifremer.fr/doc/00439/55027/ DO - 10.1371/journal.pone.0195257 N2 - Our study highlights the Lagrangian transport of solid particles discharged at the Marseille Wastewater Treatment Plant (WWTP), located at Cortiou on the southern coastline. We focused on episodic situations characterized by a coastal circulation pattern induced by intrusion events of the Northern Current (NC) on the continental shelf, associated with SE wind regimes. We computed, using MARS3D-RHOMA and ICHTHYOP models, the particle trajectories from a patch of 5.104 passive and conservative fine particles released at the WWTP outlet, during 2 chosen representative periods of intrusion of the NC in June 2008 and in October 2011, associated with S-SE and E-SE winds, respectively. Unexpected results highlighted that the amount of particles reaching the vulnerable shorelines of both northern and southern bays accounted for 21.2% and 46.3% of the WWTP initial patch, in June 2008 and October 2011, respectively. Finally, a conceptual diagram is proposed to highlight the mechanisms of dispersion within the bays of Marseille of the fine particles released at the WWTP outlet that have long been underestimated. Y1 - 2018/04 PB - Public Library Science JF - Plos One SN - 1932-6203 VL - 13 IS - 4 ID - 55027 ER -