Zmiany wielkości i składu transportu materiału rozpuszczonego w dolnym odcinku rzeki Obry

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Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk

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The studies concerning changes in concentration of the selected elements of dissolved matter have been conducted in the lower section of the Obra River in the vicinity of Międzyrzecz. The main research objective was to determine the changes in transportation volume of dissolved matter as well as the analysis of changes of concentration of the selected chemical elements in diverse hydrological conditions. Twelve measurement series have been completed in order to define bathymetry of the riverbed and changes of flow volume. During field research, a total of 111 samples of water have been collected in order to determine the concentration of calcium, sodium, potassium, chlorides, phosphates and the measurements of electrolytic conductivity proper performed. It has been found that the geological structure of the Obra River catchment influences the concentration of the studied elements as well as the intensity of lixiviation processes, the effect of dilution, intensity of atmospheric precipitation and fertilization in agricultural areas. Also, it has been observed that the winter half-year was characterized by much greater volumes of transported dissolved matter in comparison with the summer half-year. The reason for this could be the denudational processes, the length of the vegetative period as well as the agricultural use of land.




Dissolved matter, Riverbed, the Obra valley


Badania Fizjograficzne, Seria A, Tom 62, 2011, s. 115-133




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Uniwersytet im. Adama Mickiewicza w Poznaniu
Biblioteka Uniwersytetu im. Adama Mickiewicza w Poznaniu
Ministerstwo Nauki i Szkolnictwa Wyższego