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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
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 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 5 arcmin resolution, but a version parameterized at 30 arcmin 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 5 arcmin versions, and evaluate their model performance using Global Runoff Data Centre discharge data. Results show that model performance of the 5 arcmin version is notably better than that of the 30 arcmin version. Furthermore, we compare simulated time series of total water storage (TWS) of the 5 arcmin 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.
Citation: Sutanudjaja, E. H., van Beek, R., Wanders, N., Wada, Y., Bosmans, J. H. C., Drost, N., van der Ent, R. J., de Graaf, I. E. M., Hoch, J. M., de Jong, K., Karssenberg, D., López López, P., Peßenteiner, S., Schmitz, O., Straatsma, M. W., Vannametee, E., Wisser, D., and Bierkens, M. F. P.: PCR-GLOBWB 2: a 5 arcmin global hydrological and water resources model, Geosci. Model Dev., 11, 2429-2453, https://doi.org/10.5194/gmd-11-2429-2018, 2018.
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Short summary
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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