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OBIEKTY KRENOLOGICZNE W D OLNEJ CZĘŚCI DORZECZA WISŁY (PO ZLEWNIĘ DRWĘCY)

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Choiński A. , Ptak M.

On the basis of hydrographic maps in the scale 1:50,000, an inventory of crenological objects in the lower part of the Vistula basin up to the Drwęca river basin in the south was made. The total number of these objects in the analyzed area is 308, with the highest number of solid sources – 161, followed by leakages – 125 and periodic sources – 17. The total efficiency of all outflows is very low, as it was estimated at 0.075 m3∙s–1. The most efficient source reaches only 1.0 dm3∙s–1, and only a few 0.7 dm3∙s–1.

On the basis of hydrographic maps in the scale 1:50,000, an inventory of crenological objects in the lower part of the Vistula basin up to the Drwęca river basin in the south was made. The total number of theseobjects in the analyzed area is 308, with the highest number of solid sources – 161, followed by leakages – 125 and periodic sources – 17. The total efficiency of all outflows is very low, as it was estimated at 0.075 m3∙s–1. The most efficient source reaches only 1.0 dm3∙s–1, and only a few 0.7 dm3∙s–1.

ZMIANY PARAMETRÓW MORFOMETRYCZNYCH JEZIORA STRZESZYŃSKIEGO

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Choiński A. , Każmierska A.

The paper analyses the changes in the Strzeszyńskie lake basin, located within the borders of the city of Poznań. The study was based on five topographic maps from the years: Moreover, the morphometric parameters of the basins from 1908, 1992 and 2013 were compared. Although the lake is located only a few kilometers from the center of Poznan, its basin has not changed significantly. Undoubtedly, this is influenced by the development of the lake basin. At present, however, there are symptoms indicating the worsening state of the waters.

Zmiany powierzchni i zarastanie jezior w Polsce

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Choiński A. , Skowron R.

2021

nr 12 (72)

125-140

The paper presents changes in the surface area and overgrowing of the largest Polish lakes (> 500 ha). It has been established (on the basis of 4 analyzed time sequences) that over the last 80 years there has been a gradual reduction of the lake area. At the same time, the area occupied by emerged vegetation has increased. This is confirmed by the lake overgrowth rate and the shoreline overgrowth rate.

Batymetria jezior meteorytowych w rezerwacie „Meteoryt Morasko”

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Choiński A. , Ptak M.

tom 8

23-29

The paper presents results of bathymetric measurements performed on three crater lakes located in the “Meteoryt Morasko” reserve in west Poland. The maximum depth of the largest of the analysed lakes (1695 m2) was determined to amount to 2.6 m. The parameters of the lake (surface area, depth, etc.) are largely determined by a ditch dug through the crater in the north-western part of the lake, affecting the maximum water volume accumulated in the lake.

Changes of the surface area of Morskie Oko and Wielki Staw in the Tatra Mountains

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Choiński A. , Zieliński A.

nr 1

15-24

This dissertation has presented the results of measurements regarding the surface area of Morskie Oko and Wielki Staw lakes performed throughout the period of 140-years with the use of various measurement technologies and analyses of cartographic resources. The research has clearly demonstrated that the obtained results are diverse, which could be influenced by various environmental factors and the time difference of surveys conducted at the ana- lysed objects. Wielki Staw is currently the largest lake in the Polish Tatra Mountains. Its surface area in 2021 covered 33.44 ha. Thus, it appeared to be larger than Morskie Oko, the surface area of which is 1.51 ha. It was also concluded that the difference in the size of these two reservoirs might increase over time since Morskie Oko is situated in an environment that undergoes dynamic transformations and, consequently, has an impact on the evolution of this lake. Moreover, the area surrounding Morskie Oko is one of the most popular tourist locations within the Tatra National Park, which may intensify the anthropogenic impact on the course of, among others, the shoreline.