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| Titel |
A past discharges assimilation system for ensemble streamflow forecasts over France – Part 1: Description and validation of the assimilation system |
| VerfasserIn |
G. Thirel, E. Martin, J.-F. Mahfouf, S. Massart, S. Ricci, F. Habets |
| 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 ; 14, no. 8 ; Nr. 14, no. 8 (2010-08-24), S.1623-1637 |
| Datensatznummer |
250012404
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| Publikation (Nr.) |
 copernicus.org/hess-14-1623-2010.pdf |
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| Zusammenfassung |
| Two Ensemble Streamflow Prediction Systems (ESPSs) have been set up at
Météo-France. They are based on the French SIM distributed
hydrometeorological model. A deterministic analysis run of SIM is used to
initialize the two ESPSs. In order to obtain a better initial state, a past
discharges assimilation system has been implemented into this analysis SIM
run, using the Best Linear Unbiased Estimator (BLUE). Its role is to improve
the model soil moisture by using streamflow observations in order to better
simulate streamflow. The skills of the assimilation system were assessed for
a 569-day period on six different configurations, including two different
physics schemes of the model (the use of an exponential profile of hydraulic
conductivity or not) and, for each one, three different ways of considering
the model soil moisture in the BLUE state variables. Respect of the linearity
hypothesis of the BLUE was verified by assessing of the impact of iterations
of the BLUE. The configuration including the use of the exponential profile
of hydraulic conductivity and the combination of the moisture of the two soil
layers in the state variable showed a significant improvement of streamflow
simulations. It led to a significantly better simulation than the reference
one, and the lowest soil moisture corrections. These results were confirmed
by the study of the impacts of the past discharge assimilation system on a
set of 49 independent stations. |
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