Badania Fizjograficzne, Seria A, Tom 67, 2016
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Browsing Badania Fizjograficzne, Seria A, Tom 67, 2016 by Author "Plewa, Katarzyna"
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Item Odpływ rzeczny w zlewni górnej i środkowej Odry w różnych fazach oscylacji północnoatlantyckiej(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2016) Wrzesiński, Dariusz; Waszczak, Karolina; Plewa, KatarzynaThe study area covers watersheds in the upper and middle parts of the Oder basin down to Słubice. This region is interesting in terms of its diverse climatic, hydrological, geomorphological and environmental conditions. The study contains hydrometric data from 94 gauging stations located on 53 rivers from 1971 to 2010. Calculations were made of the outflow for the entire period in question as well as for years with high and low values of the winter NAODJFM index. On the basis of a test of the significance of differences in the outflow between the average period and the years in positive and negative phases of the NAODJFM, the effects of the changes in the intensity of the North Atlantic Oscillation on the flow of the rivers in the basin of the upper and middle Oder were examined. In a negative NAODJFM phase, in 90 catchments the outflow was above the average. In a positive NAODJFM phase, the annual outflows on most rivers were below the average.Item Stability of the water levels regime on the lakes in Poland(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2016) Wrzesiński, Dariusz; Plewa, KatarzynaThe paper presents the results of a study into the stability of water-level regimes in Polish lakes. Stability is defined as a degree of regularity with which a certain phase of the hydrological regime occurs (high and low water levels). The hydrological regime is described with the use of the following 6 variables – first, second and third maximum; first, second and third minimum. Stability of the hydrological regime is determined by the stability coefficient (WS). The analysis relies on data concerning average monthly values of water levels for 34 lakes located in Polish lake regions. There are characteristic spatial differences in the stability of maximum and minimum water levels which are usually caused by environmental factors and human activity. It was observed that the most stable dates were those of the 1st maximum and the 1st minimum. In the case of the lakes in the Pomeranian, Wielkopolsko-Kujawskie and Mazurian lake districts, the occurrence date of the 1st maximum is highly stable and stable, while the date of the 1st minimum is the most stable in the lakes of the Drawsko, Wielkopolsko-Kujawskie and Mazurian lake districts.