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Modeling the magnitude of submarine groundwater discharge and its effect on sediment chemistry



Modeling the magnitude of submarine groundwater discharge and its effect on sediment chemistry



IHP/OHP-Berichte 13(Pages 243-247



Submarine groundwater discharge (SGD) into coastal waters and the ocean is important for hydrological budgets, groundwater resource issues, and the release of nutrients and trace gases from the seafloor. In several regions, ecological effects including offshore plankton blooms are associated with the submarine discharge of groundwater. In Eckernforde Bay (W. Baltic Sea) seepage of freshwater from sub-seafloor aquifers was observed by video observations, sediment sampling, and by high resolution bathymetric and side scan sonar surveys by an Autonomous Underwater Vehicle (AUV). Discharge occurs as dispersed flow from muddy sediments and from well defined morphological features, so-called pockmarks. The relation of these features to groundwater seepage was proven by pore water investigations of the methane and chloride concentration. By a submarine well system we were able to sample the sub-seafloor aquifer directly, allowing age dating of the groundwater. The spatial distribution of freshwater discharge was derived and a budget was computed for the entire bay. For this purpose a numerical advection-diffusion model was applied. The two-dimensional structure of flow within a pockmark was considered by an intense sampling scheme and 2D transport-reaction modeling. By numerical modeling the flow field within a pockmark was studied.

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Accession: 004236981

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