Abstract
The present study concerns the erosion and transport of severely contaminated sediments in a Canal. It begins in the context of an engineering project aimed to re-introduce a forced convection at the entrance of this Canal by pumping marine water. The local wind is often strong enough to overpass the resuspension threshold; thus, there is a serious risk of downstream contamination of a Mediterranean lagoon. So, the goal is to evaluate this risk as a function of the pumping rate; this contamination is transported by the fine suspended particles. Different scenarios are investigated to determine the downstream transport of suspensions in terms of runoff. These scenarios (of 24 h) contains a succession of 3 periods: constant wind speed, wind slowdown and calm, for two opposite wind directions. Special attention is devoted to the modeling of complex mechanisms of erosion and resuspension during wind periods, deposition during windless periods and sediment consolidation. The main results concern the total flux of the suspended particles through the exit of the Canal at the confluence with the lagoon. It is shown that even for moderate runoff (<6 m3/s) this total flux is large enough, not only during the wind period, but also after several hours of calm.
Highlights
This paper is devoted to a 3D hydrodynamics and transport of polluted particulate matter resuspended from the bottom sediment in a long and narrow Canal in the frame of an old and complex engineering project of partial reopening of a collapsed tunnel (Figure 1)
The Rove Canal deposits are mostly cohesive (78% silt and 6% clay); the remaining part being sand
We study the impact of the forced convection (Q1 ) and the wind forcing on the processes of erosion, resuspension, deposition and consolidation along the Rove Canal by using a set of 18 academic model wdir,wsp scenarios of 24 h
Summary
This paper is devoted to a 3D hydrodynamics and transport of polluted particulate matter resuspended from the bottom sediment in a long and narrow Canal (called Rove) in the frame of an old and complex engineering project of partial reopening of a collapsed tunnel (Figure 1). The aim of this reopening project is the remediation of the bottom sediment of the Rove Canal. It pointed different alarming ecological and environmental problems due to a severe concentration of contaminants in the sediments of the Rove Canal, and an evident risk of a downstream contamination of the Etang de
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