Surface-groundwater exchange between a wetland, sandur, and lava field in southeastern Iceland

Abstract In May 2019, over 50 springs were identified at a sandur-lava field–wetland complex in Southeast Iceland and subset was selected for further investigation including monitoring water levels, discharge, chemistry. Between September the study site had relatively stable levels temperatures (4–5 °C), although heavy rains (>10 mm) corresponded with increased and/or some springs. Together, level, temperature, isotope data suggest that are fed by older groundwater from an aquifer is recharged precipitation. Spikes level indicated least one spring edge of sandur also received floodwater shallow subsurface flows glacial-fed Brunná River. One wetland monitored year (October 2019 to October 2020). Like other springs, remained stable, fluctuating inputs Longer-term studies will be needed gain improved understanding seasonal vulnerability climate change their role functioning coastal Iceland.