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| Titel |
Climatic controls on diffuse groundwater recharge across Australia |
| VerfasserIn |
O. V. Barron, R. S. Crosbie, W. R. Dawes, S. P. Charles, T. Pickett, M. J. Donn |
| 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 ; 16, no. 12 ; Nr. 16, no. 12 (2012-12-04), S.4557-4570 |
| Datensatznummer |
250013604
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| Publikation (Nr.) |
 copernicus.org/hess-16-4557-2012.pdf |
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| Zusammenfassung |
| Reviews of field studies of groundwater recharge have attempted to
investigate how climate characteristics control recharge, but due to a lack
of data have not been able to draw any strong conclusions beyond that
rainfall is the major determinant. This study has used numerical modelling
for a range of Köppen-Geiger climate types (tropical, arid and
temperate) to investigate the effect of climate variables on recharge for
different soil and vegetation types. For the majority of climate types, the
correlation between the modelled recharge and total annual rainfall is
weaker than the correlation between recharge and the annual rainfall
parameters reflecting rainfall intensity. Under similar soil and vegetation
conditions for the same annual rainfall, annual recharge in regions with
winter-dominated rainfall is greater than in regions with summer-dominated
rainfall. The importance of climate parameters other than rainfall in
recharge estimation is highest in the tropical climate type. Mean annual
values of solar radiation and vapour pressure deficit show a greater
importance in recharge estimation than mean annual values of the daily mean
temperature. Climate parameters have the lowest relative importance in
recharge estimation in the arid climate type (with cold winters) and the
temperate climate type. For 75% of all soil, vegetation and climate types
investigated, recharge elasticity varies between 2 and 4 indicating a 20%
to 40% change in recharge for a 10% change in annual rainfall.
Understanding how climate controls recharge under the observed historical
climate allows more informed choices of analogue sites if they are to be
used for climate change impact assessments. |
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