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The protection of reservoir water against the eutrophication process

100%

Balcerzak W.

Polish Journal of Environmental Studies

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2006

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tom 15

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nr 6

The article analyzes methods for the protection of reservoir water against the eutrophication process. It discusses methods for protection against point-source, spatial and dispersed pollution, biological methods and the most frequently applied technical methods. It pays special attention to the application of mathematical modelling to predict changes in water quality. A simulation of water quality changes in the Dobczyce Reservoir, expressed by a change in the concentration of chlorophyll "a," was made. Calculations were made for different pollutant concentrations and different temperatures. It was found that temperature had an important impact on the course of the process in surface segments and that pollutant load exerted an influence in subsurface segments. In sediment segments, the factors did not practically affect the course of the eutrophication process.

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Magnesium concentrations in the waters of re-naturised reservoirs in rural areas

86%

Koc J., Sobczynska-Wojcik K., Skwierawski A.

Journal of Elementology

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2008

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tom 13

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nr 3

The objective of the study has been to determine magnesium concentrations and their seasonal changes in waters of re-naturised reservoirs situated in a rural area, 25 years after their re-creation. The study included 3 small, non-flow-through reservoirs, situated close to the village of Setal, in the commune of Dywity. Water samples for analysis were collected once a month in 2005 and 2006. They were examined in respect of the magnesium level and such physicochemical parameters as temperature, pH, oxygenation, dissolved oxygen, electrolyte conduction and water depth. The results prove that the environment of the surface waters in this area is poor in magnesium (5.2 mg⋅dm-3 - 6.6 mg⋅dm-3 on average), which is characteristic for postglacial regions. The re-created water reservoirs can be listed in water quality class I in terms of their magnesium content. The waters of these small re-created lakes were characterised by huge seasonal changes of magnesium concentrations. However, the fluctuations of Mg+2 concentrations were often larger within particular sites than between the examined reservoirs. The highest average seasonal magnesium concentration of 6.6 mg.dm-3, varying from 3.9 mg⋅dm-3 to 10.0 mg⋅dm-3, was determined in the waters of a reservoir whose whole catchment had for many years been used for agriculture. The lowest magnesium concentrations in the waters of the reservoirs occurred in springtime, with a slight increase in early summer and an equally slight decline afterwards. No significant increase in magnesium amounts was found until autumn, before they reached their peaks in wintertime. Such a course of fluctuations was caused by the maximum magnesium biosorption in spring and releasing internal reserves (green matter and bottom deposits) of the reservoirs in autumn and winter. Decrease and increase in the Mg+2 ion concentration in the waters of the reservoirs occurred in two ‘pulses’: in the springtime and wintertime, respectively.

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Gamma radiations in surface and groundwaters of the Rugia Island

58%

Janukowicz H., Wira J.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

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1999

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tom 03

4

Sztuka filtrowania

29%

Syga P.

Kwietnik

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2005

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nr 09

54-56

Ograniczanie wyników

1 Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

1 Journal of Elementology

1 Kwietnik

1 Polish Journal of Environmental Studies

1 Balcerzak W.

1 Janukowicz H.

1 Koc J.

1 Skwierawski A.

1 Sobczynska-Wojcik K.

1 Syga P.

1 Wira J.

1 2008

1 2006

1 2005

1 1999

The protection of reservoir water against the eutrophication process

Magnesium concentrations in the waters of re-naturised reservoirs in rural areas

Gamma radiations in surface and groundwaters of the Rugia Island

Sztuka filtrowania