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| Titel |
An assessment of global net irrigation water requirements from various water supply sources to sustain irrigation: rivers and reservoirs (1960-2050) |
| VerfasserIn |
S. Yoshikawa, J. Cho, H. G. Yamada, N. Hanasaki, S. Kanae |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 10 ; Nr. 18, no. 10 (2014-10-31), S.4289-4310 |
| Datensatznummer |
250120510
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| Publikation (Nr.) |
 copernicus.org/hess-18-4289-2014.pdf |
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| Zusammenfassung |
| Water supply sources for irrigation (e.g. rivers and reservoirs) are
critically important for agricultural productivity. The current rapid
increase in irrigation water use is considered unsustainable and threatens
food production. In this study, we estimated the time-varying dependence of
irrigation water requirements from water supply sources, with a particular
focus on variations in irrigation area during past (1960–2001) and future
(2002–2050) periods using the global water resources model, H08. The H08
model can simulate water requirements on a daily basis at a resolution of
1.0° × 1.0° latitude and longitude. The sources
of irrigation water requirements in the past simulations were specified
using four categories: rivers (RIV), large reservoirs (LR) with a storage
capacity greater than 1.0 × 109 m3, medium-size
reservoirs (MSR) with storage capacities ranging from 1.0 × 109 m3
to 3.0 × 106 m3, and non-local non-renewable
blue water (NNBW). The simulated results from 1960 to 2001 showed that RIV, MSR and
NNBW increased significantly from the 1960s to the early 1990s globally, but
LR increased at a relatively low rate. After the early 1990s, the increase in
RIV declined as it approached a critical limit, due to the continued expansion
of irrigation area. MSR and NNBW increased significantly, during the same time
period, following the expansion of the irrigation area and the increased
storage capacity of the medium-size reservoirs. We also estimated future
irrigation water requirements from the above four water supply sources and
an additional water supply source (ADD) in three future simulation designs;
irrigation area change, climate change, and changes in both irrigation area
and climate. ADD was defined as a future increase in NNBW. After the 2020s, MSR was
predicted to approach the critical limit, and ADD would account for 11–23%
of the total requirements in the 2040s. |
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