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 Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

In this study, we present the prediction of permeability from time domain spectral induced polarization (IP) data, measured in boreholes on undisturbed formations using the El‐log logging‐while‐drilling technique. We collected El‐log data and hydraulic properties on unconsolidated Quaternary and Miocene deposits in boreholes at three locations at a field site in Denmark, characterized by different electrical water conductivity and chemistry. The high vertical resolution of the El‐log technique matches the lithological variability at the site, minimizing ambiguity in the interpretation originating from resolution issues. The permeability values were computed from IP data using a laboratory‐derived empirical relationship presented in a recent study for saturated unconsolidated sediments, without any further calibration. A very good correlation, within 1 order of magnitude, was found between the IP‐derived permeability estimates and those derived using grain size analyses and slug tests, with similar depth trends and permeability contrasts. Furthermore, the effect of water conductivity on the IP‐derived permeability estimations was found negligible in comparison to the permeability uncertainties estimated from the inversion and the laboratory‐derived empirical relationship.

A 3-D numerical model of the influence of meanders on groundwater discharge to a gaining stream in an unconfined sandy aquifer. Journal of Hydrology, 552, 168-181. https://doi. Abstract 24Groundwater discharge to streams depends on stream morphology and groundwater flow direction, 25 but are not always well understood. Here a 3-D groundwater flow model is employed to investigate 26 the impact of meandering stream geometries on groundwater discharge to streams in an unconfined 27 and homogenous sandy aquifer at the reach scale (10-200 m). The effect of meander geometry was 28 examined by considering three scenarios with varying stream sinuosity. The interaction with regional 29 groundwater flow was examined for each scenario by considering three groundwater flow directions. 30The sensitivity of stream morphology and flow direction to other parameters was quantified by 31 varying the stream width, the meander amplitude, the magnitude of the hydraulic gradient, the 32 hydraulic conductivity, and the aquifer thickness. Implications for a real stream were then 33 investigated by simulating groundwater flow to a stream at a field site located in Grindsted, Denmark. 34