EXTREMA 1
Type | Oceanographic cruise |
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Ship | L'Europe |
Ship owner | Ifremer |
Dates | 07/03/2008 - 24/03/2008 |
Chief scientist(s) | ARNAUD Mireille |
LERCM - SITE DE TOULON CENTRE IFREMER BP 330 83507 LA SEYNE SUR MER |
|
DOI | 10.17600/8060020 |
Objective | The two EXTREMA cruises (1 and 2) focused on the influence of Rhone river inflows both in the coastal zone and in the Rhone prodelta. Stocking of fine sediments carried by the Rhone and their time of stay in the prodelta zone were particularly studied, insofar as trace contaminants are particularly associated with the finest material. This involved specifying the redistributions/translocation of masses and of related contaminants in response to storms and floods. The first cruise also provided an estimation of the sedimentary make-up before an ADCP (current and swell measurements) and an altimeter (measuring sediment level) were launched at the East Roustan buoy. The second cruise will enable another evaluation after recovering the instruments at the East Roustan buoy. In order to track inputs from land in the area, natural (210Pb, 7Be, etc.) and artificial (137Cs, 239+240Pu, etc.) radionuclides, metals and foraminifera were used as markers. Radionuclides and metals are used classically to quantify sedimentation processes and are also used in this project to study phenomena of translocated sediments carried by the Rhone River in the Gulf of Lion. |