High frequency and regular monitoring of nutrients and contaminants in rivers are needed to better constrain the spatial distribution and the evolution of anthropogenic compounds in the marine ecosystems. The uncertainty on sources contribution and the transfer mode between the marine reservoirs are important, especially for emergent substances.
The Rhone is the largest Mediterranean river in terms of its freshwater discharge and its inclusion in the Moose network is mandatory. Knowledge about the nutrient fluxes in the Rhone can be reconstructed for about the last 30 years and following the trends in the future defines one of the fundamental forcing functions of the marine ecosystems in the future.
Small rivers are naturally less important in global material budgets, but they are very typical for the Mediterranean drainage basin. Adding their fluxes together is far from being negligible and may even surpass the material transport from the large rivers. Moreover, as the small Mediterranean river basins are highly reactive to local climatic features, they may be more vulnerable in the context of climate change and modifications in the frequency of extreme climatic events (floods, droughts) can have server consequences on the river fluxes.
In the framework of MOOSE two rivers are actually equipped with autonomous samplers:, Têt and Rhône,
These stations allow daily sampling of nutrients and other basic water quality parameters during low and normal water flows, and high frequency sampling (every four hours) during floods to improve budget calculations.