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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Volume 11, issue 6
Geosci. Model Dev., 11, 2429-2453, 2018
https://doi.org/10.5194/gmd-11-2429-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Geosci. Model Dev., 11, 2429-2453, 2018
https://doi.org/10.5194/gmd-11-2429-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 20 Jun 2018

Model description paper | 20 Jun 2018

PCR-GLOBWB 2: a 5 arcmin global hydrological and water resources model

Edwin H. Sutanudjaja1, Rens van Beek1, Niko Wanders1, Yoshihide Wada1,2, Joyce H. C. Bosmans1, Niels Drost3, Ruud J. van der Ent1, Inge E. M. de Graaf4, Jannis M. Hoch1,5, Kor de Jong1, Derek Karssenberg1, Patricia López López1,5, Stefanie Peßenteiner6, Oliver Schmitz1, Menno W. Straatsma1, Ekkamol Vannametee7, Dominik Wisser8,9, and Marc F. P. Bierkens1,10 Edwin H. Sutanudjaja et al.
  • 1Department of Physical Geography, Faculty of Geosciences, Utrecht University, Utrecht, the Netherlands
  • 2International Institute for Applied Systems Analysis, Laxenburg, Austria
  • 3Netherlands eScience Center, Amsterdam, the Netherlands
  • 4Chair of Environmental Hydrological Systems, Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany
  • 5Unit Inland Water Systems, Deltares, Delft, the Netherlands
  • 6Department of Geography and Regional Science, University of Graz, Graz, Austria
  • 7Department of Geography, Chulalongkorn University, Bangkok, Thailand
  • 8Food and Agriculture Organization of the United Nations, Rome, Italy
  • 9Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, New Hampshire, USA
  • 10Unit Soil and Groundwater Systems, Deltares, Utrecht, the Netherlands

Abstract. We present PCR-GLOBWB 2, a global hydrology and water resources model. Compared to previous versions of PCR-GLOBWB, this version fully integrates water use. Sector-specific water demand, groundwater and surface water withdrawal, water consumption, and return flows are dynamically calculated at every time step and interact directly with the simulated hydrology. PCR-GLOBWB 2 has been fully rewritten in Python and PCRaster Python and has a modular structure, allowing easier replacement, maintenance, and development of model components. PCR-GLOBWB 2 has been implemented at 5arcmin resolution, but a version parameterized at 30arcmin resolution is also available. Both versions are available as open-source codes on https://github.com/UU-Hydro/PCR-GLOBWB_model (Sutanudjaja et al., 2017a). PCR-GLOBWB 2 has its own routines for groundwater dynamics and surface water routing. These relatively simple routines can alternatively be replaced by dynamically coupling PCR-GLOBWB 2 to a global two-layer groundwater model and 1-D–2-D hydrodynamic models. Here, we describe the main components of the model, compare results of the 30 and 5arcmin versions, and evaluate their model performance using Global Runoff Data Centre discharge data. Results show that model performance of the 5arcmin version is notably better than that of the 30arcmin version. Furthermore, we compare simulated time series of total water storage (TWS) of the 5arcmin model with those observed with GRACE, showing similar negative trends in areas of prevalent groundwater depletion. Also, we find that simulated total water withdrawal matches reasonably well with reported water withdrawal from AQUASTAT, while water withdrawal by source and sector provide mixed results.

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PCR-GLOBWB 2 is an integrated hydrology and water resource model that fully integrates water use simulation and consolidates all features that have been developed since PCR-GLOBWB 1 was introduced. PCR-GLOBWB 2 can have a global coverage at 5 arcmin resolution and supersedes PCR-GLOBWB 1, which has a resolution of 30 arcmin only. Comparing the 5 arcmin with 30 arcmin simulations using discharge data, we clearly find improvement in the model performance of the higher-resolution model.
PCR-GLOBWB 2 is an integrated hydrology and water resource model that fully integrates water use...
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