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Combination of geophysical and hydrogeological methods for the targeted assessment of fine-grained valley fills
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Combination of geophysical and hydrogeological methods for the targeted assessment of fine-grained valley fills
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Journal Article
Combination of geophysical and hydrogeological methods for the targeted assessment of fine-grained valley fills
2021
Overview
Sedimentary features can significantly influence flow and transport pathways in fine-grained valley fills. The spatial extent and properties of these features should be analyzed in order to determine residence times, flow pathways, and the reaction potential for contaminants. In the Ammer floodplain close to Tübingen, we examined peat layers and a gravel channel in order to determine their influence on the regional hydrogeology and hydrochemistry. Towards this end, we selected and combined geophysical and hydrogeological investigation techniques. Surface geoelectrical measurements revealed the spatial extent of relevant features, while subsequent borehole geophysical and direct-push surveys, including the in-situ detection of the sediment color, were used to assess their geometry and internal heterogeneity. At representative points, the hydraulic and biogeochemical properties of the sediments and the groundwater could be determined by targeted sampling and hydraulic tests. The general methodology of delineating relevant sub-units followed by high-resolution profiling may also be applied to investigate larger-scale valley fills.
