Abstract Study region The French Mediterranean coastline, which includes karstic springs
discharging into coastal seas and coastal lagoons. Study focus We investigated submarine
groundwater discharge (SGD), an important vector for many chemical elements that may
impact the quality of the coastal environment. First, we acquired airborne thermal infrared
(TIR) images to detect terrestrial groundwater inputs. Then we report in situ data (salinity;
temperature; radium isotopes). We use these data i) to confirm the presence of groundwater …

We investigated submarine groundwater discharge (SGD), an important vector for many
chemical elements that may impact the quality of the coastal environment. First, we acquired
airborne thermal infrared (TIR) images to detect terrestrial groundwater inputs. Few studies
have been conducted on SGD along the French Mediterranean coastline. The terrestrial
groundwater spring inputs in La Palme and Salses-Leucate coastal lagoons are in the range
(0.04–0.11) m3 s− 1,≤ 2% of the local river inputs. In comparison, total SGD estimates to La …