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| Titel |
Global modeling of withdrawal, allocation and consumptive use of surface water and groundwater resources |
| VerfasserIn |
Y. Wada, D. Wisser, M. F. P. Bierkens |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2190-4979
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| Digitales Dokument |
URL |
| Erschienen |
In: Earth System Dynamics ; 5, no. 1 ; Nr. 5, no. 1 (2014-01-14), S.15-40 |
| Datensatznummer |
250115291
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| Publikation (Nr.) |
 copernicus.org/esd-5-15-2014.pdf |
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| Zusammenfassung |
| To sustain growing food demand and increasing standard of living, global
water withdrawal and consumptive water use have been increasing rapidly. To
analyze the human perturbation on water resources consistently over large
scales, a number of macro-scale hydrological models (MHMs) have been
developed in recent decades. However, few models consider the interaction
between terrestrial water fluxes, and human activities and associated water
use, and even fewer models distinguish water use from surface water and
groundwater resources. Here, we couple a global water demand model with a
global hydrological model and dynamically simulate daily water withdrawal
and consumptive water use over the period 1979–2010, using two re-analysis
products: ERA-Interim and MERRA. We explicitly take into account the mutual
feedback between supply and demand, and implement a newly developed water
allocation scheme to distinguish surface water and groundwater use.
Moreover, we include a new irrigation scheme, which works dynamically with a
daily surface and soil water balance, and incorporate the newly available
extensive Global Reservoir and Dams data set (GRanD). Simulated surface water and
groundwater withdrawals generally show good agreement with reported national
and subnational statistics. The results show a consistent increase in both
surface water and groundwater use worldwide, with a more rapid increase in
groundwater use since the 1990s. Human impacts on terrestrial water storage
(TWS) signals are evident, altering the seasonal and interannual
variability. This alteration is particularly large over heavily regulated
basins such as the Colorado and the Columbia, and over the major irrigated
basins such as the Mississippi, the Indus, and the Ganges. Including human
water use and associated reservoir operations generally improves the
correlation of simulated TWS anomalies with those of the GRACE observations. |
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