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New paper modeling of unsaturated flow and stable water isotopes.

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The research work entitled " Improved lumped‐parameter and numerical modeling of unsaturated water flow and stable water isotopes " has been published in the peer-reviewed journal Groundwater.

By employing an improved lumped-parameter model (LPM) approach that mimics variable flow we have interpreted stable water isotope data (δ18Oand δ2H), taken over 3 years at a lysimeter site located in Germany. Lysimeter soil cores were characterized by sandy gravel  and clayey sandy silt , and both lysimeters were vegetated with maize. Results were compared with numerical simulation of unsaturated flow and stable water isotope transport using HYDRUS-1D. In addition, both approaches were extended by the consideration of preferential flow paths. Application of the extended LPM, and thus varying flow and transport parameters, substantially improved the description of stable water isotope observations in lysimeter seepage water.

The article is open access and available online under: https://ngwa.onlinelibrary.wiley.com/doi/10.1111/gwat.13244