FN Archimer Export Format PT C TI Use of passive and active tracers in the biogeochemical-3D hydrodynamical ECO-MARS3D model to assess the role of river inputs on coastal zone of France, British Channel and southern North Sea BT AF DUSSAUZE, Morgan MENESGUEN, Alain DUMAS, Franck AS 1:;2:;3:; FF 1:;2:PDG-ODE-DYNECO-BENTHOS;3:PDG-ODE-DYNECO-PHYSED; SI AUTRE BREST SE PDG-ODE-DYNECO-BENTHOS PDG-ODE-DYNECO-PHYSED UR https://archimer.ifremer.fr/doc/00068/17892/15423.pdf LA English DT Poster AB Two techniques of tracking are compared for delineating the marine area impacted by a river plume. The first one uses a simple conservative tracer released in the river during a several year long period: the probability density function of the tracer concentration in each mesh of the model is used to map 3 characteristic descriptors of the freshwater influence (10%, 50% and 90% percentiles). The second one uses a signature of the river attached to a state variable of a biogeochemical model (e.g. the Dissolved Inorganic Nitrogen components), which can be followed in space and time in the various nitrogenous state variables. Departure between the two methods increases when tracking of nitrogen is considered in biogeochemical forms more and more distant from the original D.I.N one (e.g. zooplankton or benthic detrital N). PY 2011 PD MAY ID 17892 ER EF