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| Titel |
Coupling a groundwater model with a land surface model to improve water and energy cycle simulation |
| VerfasserIn |
W. Tian, X. Li, G.-D. Cheng, X.-S. Wang, B. X. Hu |
| 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 (2012-12-18), S.4707-4723 |
| Datensatznummer |
250013614
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| Publikation (Nr.) |
 copernicus.org/hess-16-4707-2012.pdf |
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| Zusammenfassung |
| Water and energy cycles interact, making these two processes closely
related. Land surface models (LSMs) can describe the water and energy cycles
on the land surface, but their description of the subsurface water processes
is oversimplified, and lateral groundwater flow is ignored. Groundwater
models (GWMs) describe the dynamic movement of the subsurface water well,
but they cannot depict the physical mechanisms of the evapotranspiration
(ET) process in detail. In this study, a coupled model of groundwater flow
with a simple biosphere (GWSiB) is developed based on the full coupling of a
typical land surface model (SiB2) and a 3-D variably saturated
groundwater model (AquiferFlow). In this coupled model, the infiltration, ET
and energy transfer are simulated by SiB2 using the soil moisture results
from the groundwater flow model. The infiltration and ET results are applied
iteratively to drive the groundwater flow model. After the coupled model is
built, a sensitivity test is first performed, and the effect of the
groundwater depth and the hydraulic conductivity parameters on the ET are
analyzed. The coupled model is then validated using measurements from two
stations located in shallow and deep groundwater depth zones. Finally, the
coupled model is applied to data from the middle reach of the Heihe River
basin in the northwest of China to test the regional simulation capabilities
of the model. |
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