@ARTICLE{Kostecki_Maciej_A_2021,
 author={Kostecki, Maciej},
 volume={vol. 47},
 number={No 2},
 pages={115-127},
 journal={Archives of Environmental Protection},
 howpublished={online},
 year={2021},
 publisher={Polish Academy of Sciences},
 abstract={The results of the first limnological studies of the Kuźnica Warężyńska anthropogenic reservoir, by flooding the sand mine excavation, in 2005, are presented. Measurements of water temperature and the concentration of oxygen dissolved in water were made every month, from April to December, every 1 meter deep from the surface to the bottom (22m). Kuźnica Warężyńska anthropogenic lake was classified according to Olszewski and Patalas as dimictic, eumictic, stratified, stable, and extremely limnic. In terms of the share of the littoral zone in the total area, the reservoir is classified as grade II according to Dołgoff, where the pelagic zone is similar to the littoral zone. After 14 years of the reservoir's existence, during the summer stagnation period, the oxygen in the hypolimnion is completely depleted, from the 10th meter deep to the bottom, 22m. The analysis of the vertical distribution of the regression coefficient for the relationship between water temperature and the concentration of dissolved oxygen in water indicates the influence of the oxygen-free groundwater supplying the reservoir as a factor that may, in addition to the decomposition of organic matter, initiate anaerobic processes in the bottom water layer of the reservoir. When circulation ceases, the bottom eruption of oxygen-depleted groundwater is, during the summer and winter stagnation, a factor that shapes the anaerobic environment in the bottom layers of water early, initiating the internal enrichment process. Hydrological conditions, morphometry and thermal-oxygen relations of the Kuźnica Warężyńska reservoir are favorable for undertaking technical measures - changing the method of draining water from the surface to the bottom - to protect the quality of water resources.},
 type={Article},
 title={A new antrhropogenic lake Kuźnica Warężyńska - thermal and oxygen conditions after 14 years of exploitation in terms of protection and restoration},
 URL={http://ochroma.man.poznan.pl/Content/119733/PDF/Archives%20vol%2047_2pp115_127.pdf},
 doi={10.24425/aep.2021.137283},
 keywords={anthropogenic limnetic ecosystems, thermal and oxygen conditions, water reclamation of sand mine excavations, restoration of limnic ecosystems},
}