A global-scale two-layer transient groundwater model: Development and application to groundwater depletion

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dc.contributor.author de Graaf, Inge E.M.
dc.contributor.author van Beek, Rens L.P.H.
dc.contributor.author Gleeson, Tom
dc.contributor.author Moosdorf, Nils
dc.contributor.author Schmitz, Oliver
dc.contributor.author Sutanudjaja, Edwin H.
dc.contributor.author Bierkens, Marc F. P.
dc.date.accessioned 2017-08-29T16:53:48Z
dc.date.available 2017-08-29T16:53:48Z
dc.date.copyright 2017 en_US
dc.date.issued 2017-04
dc.identifier.citation de Graaf, I.E.M., van Beek, R.L.P.H., Gleeson, T., Moosdorf, N., Schmitz, O., Sutanudjaja, E.H. & Bierkens, M.F.P. (2017). A global-scale two-layer transient groundwater model: Development and application to groundwater depletion. Advances in Water Resources, (102), 53-6 en_US
dc.identifier.uri https://doi.org/10.1016/j.advwatres.2017.01.011
dc.identifier.uri https://dspace.library.uvic.ca//handle/1828/8491
dc.description.abstract Groundwater is the world’s largest accessible source of freshwater to satisfy human water needs. Moreover, groundwater buffers variable precipitation rates over time, thereby effectively sustaining river flows in times of droughts and evaporation in areas with shallow water tables. In this study, building on previous work, we simulate groundwater head fluctuations and groundwater storage changes in both confined and unconfined aquifer systems using a global-scale high-resolution (5′) groundwater model by deriving new estimates of the distribution and thickness of confining layers. Inclusion of confined aquifer systems (estimated 6–20% of the total aquifer area) improves estimates of timing and amplitude of groundwater head fluctuations and changes groundwater flow paths and groundwater-surface water interaction rates. Groundwater flow paths within confining layers are shorter than paths in the underlying aquifer, while flows within the confined aquifer can get disconnected from the local drainage system due to the low conductivity of the confining layer. Lateral groundwater flows between basins are significant in the model, especially for areas with (partially) confined aquifers were long flow paths crossing catchment boundaries are simulated, thereby supporting water budgets of neighboring catchments or aquifer systems. The developed two-layer transient groundwater model is used to identify hot-spots of groundwater depletion. Global groundwater depletion is estimated as 7013 km3 (137 km3y) over 1960–2010, which is consistent with estimates of previous studies. en_US
dc.description.sponsorship Open Access funded by VSNU. This research was funded by the Netherlands Organization for Scientific Research (NWO) under the program ‘Planetary boundaries of the global fresh water cycle’. This work was done on the Dutch national supercomputer Cartesius with the support of SURFsara. We would like to thank several colleagues, among others prof. dr. Petra Döll (Goethe University) and prof. Ying Fan (Rutgers University) and two anonymous reviewers, for their constructive comments on an earlier version of this paper. en_US
dc.language.iso en en_US
dc.publisher Advances in Water Resources en_US
dc.rights Attribution 2.5 Canada *
dc.rights.uri http://creativecommons.org/licenses/by/2.5/ca/ *
dc.title A global-scale two-layer transient groundwater model: Development and application to groundwater depletion en_US
dc.type Article en_US
dc.description.scholarlevel Faculty en_US
dc.description.reviewstatus Reviewed en_US

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