Submarine groundwater discharge in a subsiding coastal lowland: A 226Ra and 222Rn investigation in the Southern Venice lagoon

► Occurence/magnitude of submarine groundwater discharge investigated in Venice lagoon (Italy) using 226Ra and 222Rn isotopic tracers. ► Single box mass balance compared with multi boxes mass balance coupled with hydrodynamic model. ► Groundwater flux accounts for 1% of lagoon hydrological balance (1-3 times surface runoff) and 30-50% of tracers inputs. ► Necessary to assess this flux impact on nutrient budget in lagoon.