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Sezonowa zmienność transportu azotanów w rzekach Przymorza

Bogdanowicz R.

Przegląd Geofizyczny

2005

Z. 3-4

249-263

In the paper seasonal patterns of nitrate nitrogen loads were analysed for the selected Polish coastal rivers in the period often hydrologic years 1989-1998. Records of nutrient concentrations and water discharges acquired from the Institute of Meteorology and Water Management (IMGW) and the State Inspectorate of Environment Protection (PIOS) were used in the research. The analysis proved that changes in river transport of nitrate nitrogen showed well-expressed seasonal patterns that corresponded with hydrological regimes of the rivers. Nitrogen loads were the highest in winter half-year (November-April), especially during snow-melting period in March. The lowest loads occurred in summer months, mostly in July and August, when river flows and nitrates concentrations were the lowest. During winter half-year on average about 70% of the total annual load of nitrate nitrogen was transported by the Polish coastal rivers.