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EVOLUTION OF WATER TEMPERATURE IN JIU RIVER BASIN FROM THE VIEWPOINT OF THERMAL POLLUTION

Congress: 2008
Author(s):
Ecaterina LUCA, Ph.D. National Institute of Hydrology and Water Management of Romania e-mail: ecaterina.luca@hidro.ro

Keyword(s): thermal pollution, water temperature, Central Heating-and-Power Plant
AbstractThe proposed paper pursued the study and the emphasis of the negative influences of hot water evacuated from the Paroseni Central Heating-and-Power Plant (situated in a mountain area) and the Isalnita Central Heating- and-Power Plant (situated in a plain area), on the thermal regime of the Jiu River and its evolution in time, and is meant to contribute to the solving of the problems regarding the thermal pollution of the river. The main selection criteria of the two plants were the lack of an influence to the water temperature from upstream and their functioning with an open circuit cooling system, which increases the negative influences of hot water discharges evacuated into the river. The study showed that at the beginning of the analyzed period (a short time after the start-up of the plants) a significant difference was recorded (around 5-7 degrees C at the Iscroni hydrometric station and 3-7 degrees at Isalnita) between air temperature and water temperature, compared to the period anterior the start-up of the plant. The analysis of mean monthly and the mean annual water temperatures showed that in the studied period the winter phenomena disappeared completely due to a permanent thermal pollution. The thermal pollution phenomena is more accentuated during the low flow periods, especially in the case of Isalnita plant, which is in a plane region, where mean annual water and air temperatures are higher than in the mountain area.
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