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| Titel |
Modelling the water budget and the riverflows of the Maritsa basin in Bulgaria |
| VerfasserIn |
E. Artinyan, F. Habets, J. Noilhan, E. Ledoux, D. Dimitrov, E. Martin, P. Moigne |
| 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 ; 12, no. 1 ; Nr. 12, no. 1 (2008-01-22), S.21-37 |
| Datensatznummer |
250010456
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| Publikation (Nr.) |
 copernicus.org/hess-12-21-2008.pdf |
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| Zusammenfassung |
| A soil-vegetation-atmosphere transfer model coupled with a macroscale
distributed hydrological model was used to simulate the water cycle
for a large region in Bulgaria. To do so, an atmospheric forcing was built
for two hydrological years (1 October 1995 to 30 September 1997), at an eight km
resolution. The impact of the human activities
on the rivers (especially hydropower or irrigation) was taken into account.
An improvement of the hydrometeorological model was made: for better simulation of summer
riverflow, two additional reservoirs were added to simulate the slow
component of the runoff. Those reservoirs were calibrated using the observed
data of the 1st year, while the 2nd year was used for validation.
56 hydrologic stations and 12 dams were used for the model calibration while
41 river gauges were used for the validation of the model. The results compare
well with the daily-observed discharges, with good results obtained over
more than 25% of the river gauges. The simulated snow depth was compared to
daily measurements at 174 stations and the evolution of the snow water
equivalent was validated at 5 sites. The process of melting and refreezing
of snow was found to be important in this region. The comparison of the
normalized values of simulated versus measured soil moisture showed good
correlation. The surface water budget shows large spatial variations due to
the elevation influence on the precipitation, soil properties and
vegetation variability. An inter-annual difference was observed in the water
cycle as the first year was more influenced by Mediterranean climate, while
the second year was characterised by continental influence. The energy budget
shows a dominating sensible heat component in summer, due to the fact that
the water stress limits the evaporation. This study is a first step for the
implementation of an operational hydrometeorological model that could be
used for real time monitoring and forecasting of water budget components and
river flow in Bulgaria. |
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