Articles | Volume 15, issue 18
Geosci. Model Dev., 15, 7099–7120, 2022
https://doi.org/10.5194/gmd-15-7099-2022
Geosci. Model Dev., 15, 7099–7120, 2022
https://doi.org/10.5194/gmd-15-7099-2022
Development and technical paper
20 Sep 2022
Development and technical paper | 20 Sep 2022

Coupling a large-scale hydrological model (CWatM v1.1) with a high-resolution groundwater flow model (MODFLOW 6) to assess the impact of irrigation at regional scale

Luca Guillaumot et al.

Data sets

Messstellen und Archivdaten der Hydrographie Österreichs Bundesministerium für Land- und Forstwirtschaft, Regionen und Wasserwirtschaft https://ehyd.gv.at/

Model code and software

CWatM-MODFLOW model Luca Guillaumot, Mikhail Smilovic, Peter Burek, Jens de Bruijn, Peter Greve, Taher Kahil, and Yoshihide Wada (IIASA) https://doi.org/10.5281/zenodo.6609071

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Short summary
We develop and test the first large-scale hydrological model at regional scale with a very high spatial resolution that includes a water management and groundwater flow model. This study infers the impact of surface and groundwater-based irrigation on groundwater recharge and on evapotranspiration in both irrigated and non-irrigated areas. We argue that water table recorded in boreholes can be used as validation data if water management is well implemented and spatial resolution is ≤ 100 m.