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Assessment of saturated hydraulic conductivity-depth relationships and extended soil column thickness in catchment hydrological modelling
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  • Raul Mendoza,
  • Willem van Verseveld,
  • Chris Seijger,
  • Albrecht Weerts
Raul Mendoza
Wageningen University & Research Omgevingswetenschappen

Corresponding Author:raul.mendoza@wur.nl

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Willem van Verseveld
Deltares
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Chris Seijger
Wageningen University & Research Omgevingswetenschappen
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Albrecht Weerts
Wageningen University & Research Omgevingswetenschappen
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Abstract

“‘latex An appropriate soil configuration is essential in hydrological models given the role of subsurface processes in the hydrological functioning of a catchment. Hydrological models are typically set up with shallow soil depths as restricted by measurements and soil datasets that are often unavailable in greater depths. While this may be sufficient for some catchments, in some areas the water table is located deeper and thus the shallow groundwater and its link with the rest of the hydrological processes may not be captured well by the model. An important soil parameter, that is known to vary with soil depth, is the saturated hydraulic conductivity (K sat). In this study, we assessed different vertical profiles of K sat which exceed the typical soil measurement depths. The K sat profiles were implemented in wflow.jl for the distributed hydrological model wflow_sbm and tested for the Vecht catchment. Results demonstrated that increasing the soil thickness and implementing any of the K sat profiles assessed improved the discharge and mean groundwater depth predictive capabilities, albeit altering the groundwater dynamics. A sensitivity analysis revealed the respective influence of four model parameters on the groundwater dynamics which can be used as basis to optimize the model performance further.
12 Nov 2024Submitted to Hydrological Processes
13 Nov 2024Submission Checks Completed
13 Nov 2024Assigned to Editor
13 Nov 2024Reviewer(s) Assigned
17 Nov 2024Reviewer(s) Assigned