Articles | Volume 15, issue 18
https://doi.org/10.5194/gmd-15-7099-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-15-7099-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
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
Water Security Research Group, Biodiversity and Natural Resources
Program, International Institute for Applied Systems Analysis (IIASA),
Laxenburg, Austria
Mikhail Smilovic
Water Security Research Group, Biodiversity and Natural Resources
Program, International Institute for Applied Systems Analysis (IIASA),
Laxenburg, Austria
Peter Burek
Water Security Research Group, Biodiversity and Natural Resources
Program, International Institute for Applied Systems Analysis (IIASA),
Laxenburg, Austria
Jens de Bruijn
Water Security Research Group, Biodiversity and Natural Resources
Program, International Institute for Applied Systems Analysis (IIASA),
Laxenburg, Austria
Institute for Environmental Studies, VU University, De Boelelaan
1087, 1081HV, Amsterdam, the Netherlands
Peter Greve
Water Security Research Group, Biodiversity and Natural Resources
Program, International Institute for Applied Systems Analysis (IIASA),
Laxenburg, Austria
Taher Kahil
Water Security Research Group, Biodiversity and Natural Resources
Program, International Institute for Applied Systems Analysis (IIASA),
Laxenburg, Austria
Yoshihide Wada
Water Security Research Group, Biodiversity and Natural Resources
Program, International Institute for Applied Systems Analysis (IIASA),
Laxenburg, Austria
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Robert Reinecke, Hannes Müller Schmied, Tim Trautmann, Lauren Seaby Andersen, Peter Burek, Martina Flörke, Simon N. Gosling, Manolis Grillakis, Naota Hanasaki, Aristeidis Koutroulis, Yadu Pokhrel, Wim Thiery, Yoshihide Wada, Satoh Yusuke, and Petra Döll
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Billions of people rely on groundwater as an accessible source of drinking water and for irrigation, especially in times of drought. Groundwater recharge is the primary process of regenerating groundwater resources. We find that groundwater recharge will increase in northern Europe by about 19 % and decrease by 10 % in the Amazon with 3 °C global warming. In the Mediterranean, a 2 °C warming has already lead to a reduction in recharge by 38 %. However, these model predictions are uncertain.
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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.
We develop and test the first large-scale hydrological model at regional scale with a very high...