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| Titel |
Discharge simulation in the sub-basins of the Amazon using ORCHIDEE forced by new datasets |
| VerfasserIn |
M. Guimberteau, G. Drapeau, J. Ronchail, B. Sultan, J. Polcher, J.-M. Martinez, C. Prigent, J.-L. Guyot, G. Cochonneau, J. C. Espinoza, N. Filizola, P. Fraizy, W. Lavado, E. Oliveira, R. Pombosa, L. Noriega, P. Vauchel |
| 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. 3 ; Nr. 16, no. 3 (2012-03-22), S.911-935 |
| Datensatznummer |
250013219
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| Publikation (Nr.) |
 copernicus.org/hess-16-911-2012.pdf |
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| Zusammenfassung |
| The aim of this study is to evaluate the ability of the ORCHIDEE land surface
model to simulate streamflows over each sub-basin of the Amazon River basin.
For this purpose, simulations are performed with a routing module including
the influence of floodplains and swamps on river discharge and validated
against on-site hydrological measurements collected within the HYBAM
observatory over the 1980–2000 period. When forced by the NCC global
meteorological dataset, the initial version of ORCHIDEE shows discrepancies
with ORE HYBAM measurements with underestimation by 15% of the annual mean
streamflow at Óbidos hydrological station. Consequently, several
improvements are incrementally added to the initial simulation in order to
reduce those discrepancies. First, values of NCC precipitation are
substituted by ORE HYBAM daily in-situ rainfall observations from the
meteorological services of Amazonian countries, interpolated over the basin.
It highly improves the simulated streamflow over the northern and western
parts of the basin, whereas streamflow over southern regions becomes
overestimated, probably due to the extension of rainy spots that may be
exaggerated by our interpolation method, or to an underestimation of
simulated evapotranspiration when compared to flux tower measurements.
Second, the initial map of maximal fractions of floodplains and swamps which
largely underestimates floodplains areas over the main stem of the Amazon
River and over the region of Llanos de Moxos in Bolivia, is substituted by a
new one with a better agreement with different estimates over the basin.
Simulated monthly water height is consequently better represented in ORCHIDEE
when compared to Topex/Poseidon measurements over the main stem of the
Amazon. Finally, a calibration of the time constant of the floodplain
reservoir is performed to adjust the mean simulated seasonal peak flow at
Óbidos in agreement with the observations. |
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