Influence of restoration methods on the longevity of changes in the thermal and oxygen dynamics of a degraded lake

• Autorzy: Grochowska J. , Brzozowska R. , Łopata M. , Dunalska J.

Identyfikatory

DOI

10.1515/ohs-2015-0003

• Języki publikacji: EN

Abstrakty

EN

The study was conducted on Lake Długie, located in the city of Olsztyn, which for 20 years received raw domestic sewage (400 m3 per day). After preliminary conservation operations, the lake was restored by artificial circulation and phosphorus inactivation methods. During artificial circulation, water temperature in the whole lake volume was equalized. The disconnection of the compressor stimulated the return to typical thermal parameters in the lake. Phosphorus inactivation did not affect the thermal regime in the lake. Artificial circulation caused an increase in the oxygen content in the whole lake, lowered the oxygen-depletion rate during stagnation, and shortened the duration of anaerobic conditions in the near-bottom waters. Phosphorus inactivation did not directly affect the content of oxygen. However, after the coagulant was added to the lake, the oxygenation of the water was further improved owing to the depressed photosynthesis caused by drastically reduced availability of phosphate for primary producers.

Słowa kluczowe

EN

urban lake; artificial circulation; oxygen; phosphorus inactivation; temperature

• Wydawca: Institute of Oceanography University of Gdańsk
• Czasopismo: Oceanological and Hydrobiological Studies
• Rocznik: 2015
• Tom: Vol. 44, No. 1
• Strony: 19--27
• Opis fizyczny: Bibliogr. 34 poz., rys., wykr.

Twórcy

autor

Grochowska J.

• Department of Water Protection Engineering, University of Warmia and Mazury in Olsztyn, ul. Prawocheńskiego 1, 10-720 Olsztyn, Poland

autor

Brzozowska R.

• Department of Water Protection Engineering, University of Warmia and Mazury in Olsztyn, ul. Prawocheńskiego 1, 10-720 Olsztyn, Poland

autor

Łopata M.

• Department of Water Protection Engineering, University of Warmia and Mazury in Olsztyn, ul. Prawocheńskiego 1, 10-720 Olsztyn, Poland

autor

Dunalska J.

• Department of Water Protection Engineering, University of Warmia and Mazury in Olsztyn, ul. Prawocheńskiego 1, 10-720 Olsztyn, Poland

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