Caractérisation des processus aux interfaces air-eau et sédiment-eau

This doctoral thesis focuses on characterizing processes occurring at the air-water and sediment-water interfaces to quantify submarine groundwater discharge (SGD) using radium and radon isotopes.

SGD is a significant source of water, nutrients, and contaminants to coastal marine environments.

The study was conducted at various sites, including the Mediterranean coast, the Mar Menor lagoon, the Berre pond, and the Port-Miou calanque. The author employed field measurements, water sampling, and isotopic analyses to characterize SGD and its associated processes.

The research revealed substantial spatial and temporal variability in SGD, influenced by factors such as groundwater flow rates, tidal cycles, and sediment characteristics. The author identified areas with high SGD rates and assessed the role of SGD in nutrient and contaminant transport.

Understanding and quantifying SGD is crucial for effective coastal management, as it can impact water quality, nutrient cycling, and the overall health of marine ecosystems.