Ukr. geogr. z. 2017, N3:47-56
V.V. Osypov - Ukrainian Hydrometeorological Institute State Service of Ukraine on Emergencies and National Academy of Sciences of Ukraine, Kyiv;
N.M. Osadcha - Ukrainian Hydrometeorological Institute State Service of Ukraine on Emergencies and National Academy of Sciences of Ukraine, Kyiv.
The article presents a practical application of the SWAT model (Soil and Water Assessment Tool) to assess the nutrient emission from the catchment area of rivers from distributed sources. The small Holovesnya catchment was used for the model adaptation for the conditions of forest zone of Ukraine. The study area is situated on the territory of the Desna water-balance station that ensures the availability of long-term series of observations over hydrological, hydrogeological and meteorological parameters used by SWAT. The calibration and validation of the model are made using the auto-calibration software SWAT-CUP. The model performance efficiency was assessed by the following criteria: Nash–Sutcliffe coefficient (NS), the coefficient of determination (R2), the percentage of bias (PBIAS) and the RMSE-observations (root mean square error) standard deviation ratio (RSR). Simulation of water runoff in different phases of water content was performed and the leaching of nitrogen and phosphorus compounds was estimated. The role of mineral fertilizers application in formation of nutrient runoff was determined for the studied basin. The proposed model can be used to prepare river management plans and develop a program of measures to reduce the pollution of water ecosystems by nutrients from distributed sources.
Key words: 
SWAT, nitrogen, phosphorus, nutrient emission
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