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| Titel |
Spatial and temporal connections in groundwater contribution to evaporation |
| VerfasserIn |
A. Lam, D. Karssenberg, B. J. J. M. Hurk, M. F. P. Bierkens |
| 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 ; 15, no. 8 ; Nr. 15, no. 8 (2011-08-24), S.2621-2630 |
| Datensatznummer |
250012930
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| Publikation (Nr.) |
 copernicus.org/hess-15-2621-2011.pdf |
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| Zusammenfassung |
In climate models, lateral terrestrial water fluxes are usually
neglected. We estimated the contribution of vertical and lateral
groundwater fluxes to the land surface water budget at
a subcontinental scale, by modeling convergence of groundwater and
surfacewater fluxes. We present a hydrological model of the entire
Danube Basin at 5 km resolution, and use it to show the importance of
groundwater for the surface climate.
Results show that the contribution of groundwater to evaporation is significant, and can
locally be higher than 30 % in summer.
We demonstrate through the same model that this contribution also has
important temporal characteristics. A wet episode can influence groundwater
contribution to summer evaporation for several years afterwards. This indicates
that modeling groundwater flow has the potential to augment the multi-year
memory of climate models. We also show that the groundwater contribution to evaporation
is local by presenting the groundwater travel times and the magnitude of groundwater convergence.
Throughout the Danube Basin the lateral fluxes of groundwater are negligible when modeling at this
scale and resolution. This suggests that groundwater can be adequately added in land surface models
by including a lower closed groundwater reservoir of sufficient size with two-way interaction with
surface water and the overlying soil layers. |
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