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Open AccessArticle

The Role of Confluence in Shaping Water Quality Parameters on Example of the Flow-Through Lake Bikcze (Eastern Poland)

1
Department of Hydrobiology and Protection of Ecosystems, University of Life Sciences, 13 Akademicka St., 20-950 Lublin, Poland
2
Department of Hydrology, Maria Curie-Skłodowska University, Aleja Kraśnicka 2 cd, 20-718 Lublin, Poland
*
Author to whom correspondence should be addressed.
Water 2018, 10(6), 679; https://doi.org/10.3390/w10060679
Received: 4 April 2018 / Revised: 21 May 2018 / Accepted: 22 May 2018 / Published: 24 May 2018
(This article belongs to the Special Issue Eutrophication Management: Monitoring and Control)
The role of confluence (flowability) in shaping the concentration of dissolved oxygen (DO), chlorophyll-a (chl-a) and pH was determined using a model approach. The calculations considered both horizontal and vertical variability of parameters. There was a general tendency for the pH and oxygen to increase along the transect connecting the place of surface water inlet, deepest point of the lake basin and the place of water outlet, and the reverse tendency for chlorophyll. The average gradient for particulate radius was calculated as arithmetic mean value of six partial gradients (corresponding to individual depths, every 0.5 m). Values of average gradients indicated high dynamics of DO and pH concentration changes as well as low chlorophyll-a variability. A slight inclination of the final resultant vector gradients of DO and pH from the surface water inlet, deepest point of the lake basin and the place of water outlet transect indicated the dominant role of confluence in these parameters variability (values amounted to 6.08 mg·km−1 and 3.34 pH units·km−1, respectively). The value of the chlorophyll-a gradient vector (1.86 µg·km−1) indicated a slight differentiation of the parameter in the basin, independent of the hydrological conditions. The concentration of chl-a in the polymictic Lake Bikcze resulted from the effect of the limnic conditions; the flowability of the lake was just one of many factors affecting the variability of the parameter. View Full-Text
Keywords: polymictic lake; confluence; modeling approach; tributaries input; limnetic conditions polymictic lake; confluence; modeling approach; tributaries input; limnetic conditions
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Ferencz, B.; Dawidek, J. The Role of Confluence in Shaping Water Quality Parameters on Example of the Flow-Through Lake Bikcze (Eastern Poland). Water 2018, 10, 679.

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