Geoscientific Model Development
Geoscientific Model Development
GMD
Articles | Volume 19, issue 17
Articles | Volume 19, issue 17
https://doi.org/10.5194/gmd-19-8233-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-19-8233-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 17
Model description paper
 | 
07 Sep 2026
Model description paper |  | 07 Sep 2026

GWSWEX v1.0: a dual-solver 1D unsaturated zone model for mass-conservative groundwater recharge and runoff computation in distributed hydrological modelling

Veethahavya Kootanoor Sheshadrivasan and Jakub Langhammer

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Short summary
Water constantly flows between rivers, soils, and aquifers, but capturing this accurately in numerical models is difficult. Detailed models are too expensive for regional use; simpler ones lack the resolution to track groundwater and soil moisture correctly. We built a model bridging this gap using two interchangeable numerical approaches. Tests across six soil types showed near-centimetre groundwater accuracy, making it suitable for ensemble simulations and regional climate-impact studies.
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