Modelling phosphorus inflow to the Mozhayskoe reservoir with the HYPE hydrological model

Biogenic flow is the determining factor of ecological well-being of water bodies. It depends on a number of factors, such as weather conditions, soil and vegetation cover, agricultural use of the catchment area. Its simulation is possible based on a complex water quality model with parameters distribution. In this paper, we show that the model calculates the water flow with satisfactory accuracy and gives reliable values of phosphorus flow in the investigated river outlet. The influence of dryness of the year on the phosphorus flow is important and reduces dissolved phosphorus flow several times. The results of experiments with the model show a decrease of dissolved phosphorus flow subsequent to cease of fertilizing in range from 5 to 11%. The values of the surface and groundwater genetic components of phosphorus flow are comparable, while soil component amounts 65% of local phosphorus flow.