One key objective in the MODAL long-term monitoring approach is to identify possible links between groundwater flow through coarse-grained marine sediments and their associated leaching of clays which supposedly weakens the latter and may cause sediment creep and, eventually, failure. The instrument to identify and possibly quantify such groundwater seepage is the Radon (Rn) probe KATARINA, a prototype of which was recently purchased by MARUM. The innovative, one-of-its-kind marine Rn instrument developed by HCMR Athens monitors radioactivity in fluids and will be a powerful means in assessing whether elevated Rn content, a proxy that will unravel effects of transients Var river discharge or non-confined aquifer activity, will positively correlate with elevated pore P transients measured by the IFREMER piezometers. Continuer la lecture de « New long-term instrument tested offshore Nice Airport »
During the Fluid3D campaign (november 2018, R/V L’Europe), a new investigation of both seafloor morphology and water column was done between 10 and 300 m water depth in the frame of the MODAL project by using the ME70 and EM2040 multibeam systems. New DTMs with a horizontal resolution of 2 to 1 m were made. Continuer la lecture de « New Investigation in the Frame of the MODAL Project »