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Towards an improved understanding of biogeochemical processes across surface-groundwater interactions in intermittent rivers and ephemeral streams
journal contributionposted on 09.08.2021, 04:59 by Lluís Gómez-Gener, Andre SiebersAndre Siebers, María Isabel Arce, Shai Arnon, Susana Bernal, Rossano Bolpagni, Thibault Datry, Giulia Gionchetta, Hans-Peter Grossart, Clara Mendoza-Lera, Vivien Pohl, Ute Risse-Buhl, Oleksandra Shumilova, Ourania Tzoraki, Daniel von Schiller, Alexander Weigand, Gabriele Weigelhofer, Dominik Zak, Annamaria Zoppini
Surface-groundwater interactions in intermittent rivers and ephemeral streams (IRES), waterways which do not flow year-round, are spatially and temporally dynamic because of alternations between flowing, non-flowing and dry hydrological states. Interactions between surface and groundwater often create mixing zones with distinct redox gradients, potentially driving high rates of carbon and nutrient cycling. Yet a complete understanding of how underlying biogeochemical processes across surface-groundwater flowpaths in IRES differ among various hydrological states remains elusive. Here, we present a conceptual framework relating spatial and temporal hydrological variability in surface water-groundwater interactions to biogeochemical processing hotspots in IRES.