|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) |
(Article) Publié: Plos One, vol. 13 p. (2018)
Ref HAL: hal-01778968_v1
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Our study highlights the Lagrangian transport of solid particles discharged at the MarseilleWastewater Treatment Plant (WWTP), located at Cortiou on the southern coastline. Wefocused on episodic situations characterized by a coastal circulation pattern induced byintrusion events of the Northern Current (NC) on the continental shelf, associated with SEwind regimes. We computed, using MARS3D-RHOMA and ICHTHYOP models, the particletrajectories from a patch of 5.104 passive and conservative fine particles released at theWWTP outlet, during 2 chosen representative periods of intrusion of the NC in June 2008and in October 2011, associated with S-SE and E-SE winds, respectively. Unexpectedresults highlighted that the amount of particles reaching the vulnerable shorelines of bothnorthern and southern bays accounted for 21.2% and 46.3% of the WWTP initial patch, inJune 2008 and October 2011, respectively. Finally, a conceptual diagram is proposed tohighlight the mechanisms of dispersion within the bays of Marseille of the fine particlesreleased at the WWTP outlet that have long been underestimated.