Floating debris transport in the Hyeres Bay

  • This experimental study has been conducted in the Hyeres Bay coastal environment. This coastal area is a semi-sheltered bay , bounded by the "ile d'Or", that are port-cros, porquerolles and levant islands. They are part of the Parc National de Port-Cros, a marine protected area. The study aims at understanding the main paths for the floating debris in the area, depending on the environmental conditions : current, wind, waves and river runoff. The methodology used is a lagrangian experimental approach: by deploying lagrangian floats featured with GPS devices, we can understand the main circulation patterns depending on the environmental conditions. Hence we can deduce the main coastal or at -sea areas targeted by eventual drifting floating debris. For the campaigns, we have either released the floats at the different river mouths of the zone (see figure below) or we have released them in the bay, using a grid pattern in order to get the trajectory of drifting debris that would have been brought from oustide currents, such as the northern current, the major current bounding the area.
  • The type of visual results obtained after around 6h of drift , when the river mouths were targeted, is shown in the figure below.
  • Most of the results can be found in the final technical report (pdf)
  • Recent papers on (sub-)mesoscales

    • Declerck A., Ourmieres Y. and Molcard A. Assessment of the coastal dynamics in a nested zoom and feedback on the boundary current: the North-Western Mediterranean case, 2016. Ocean Dynamics, 66 (11), 1529-1542.
    • Barrier N, Ourmieres Y. and Petrenko A, 2016. Intrusions of the Northern Mediterranean Current on the eastern Gulf of Lion: insights from in-situ observations and high resolution numerical modelling. Ocean Dynamics, 66 (3), p 313-327.