Assessing seasonal flow dynamics at a lagoon saltwater–freshwater interface using a dual tracer approach

摘要: Abstract Study region Eastern shore of Ringkobing Fjord, a coastal lagoon at the west coast Denmark focus A dual tracer approach based on salinity and δ18O is used to assess seasonal dynamics saltwater-freshwater interface lagoon. At site, prone vary sub-seasonal or daily frequency due riverine freshwater inputs In contrast, compositions end-members only seasonally. New hydrological insights The shows be valuable in settings where end-member concentrations substantially over seasons hence, an unambiguous definition does not exist. Calculated mixing fractions using salinity, deviated from average by 18%, but were as high 97%. Although, these differences decrease 6% when δ18O, our study strongly suggests their simultaneous application. Moreover, we found that seawater intrusion occurs during summer fresh submarine groundwater discharge (SGD) low. This process reverses winter (wet season) SGD increases factor 2–3, recession saltwater wedge land. Our findings show absence waves tides, density-driven dynamics, particularly terrestrial fluxes, create major impact dynamics.