Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 12 1 2008 10.5194/hess-12-21-2008 http://www.hydrol-earth-syst-sci.net/12/21/2008/ http://www.hydrol-earth-syst-sci.net/12/21/2008/hess-12-21-2008.html http://www.hydrol-earth-syst-sci.net/12/21/2008/hess-12-21-2008.pdf 21 37 2008-01-22 Modelling the water budget and the riverflows of the Maritsa basin in Bulgaria E. Artinyan eram.artinian@meteo.bg F. Habets J. Noilhan E. Ledoux D. Dimitrov E. Martin P. Le Moigne NIMH-regional centre, 139 Ruski blvd., Plovdiv, Bulgaria CNRM-GAME (Météo-France,CNRS), 42 Coriolis ave., 31057 Toulouse, France ENSMP/CIG, 35 St Honoré st., 77305 Fontainebleau, France 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. 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