Abstract
A large number of reservoirs in Korea have experienced eutrophication and deterioration of water quality including the occurrence of algal blooms, anaerobic state near the bottom due to excessive oxygen consumption, and the elution of nutrients from the sediment. Non-powered water circulation system inducing downward flow from wind-driven current has been developed for domestic reservoirs with shallow water depth. One of the functions of the system is to improve water quality by breaking thermal stratification and prohibiting anaerobic condition near the bottom. The monitoring results of the test-bed, which have been observed for 1 year, showed clearly that the circulation system could maintain DO (dissolved oxygen) concentration higher than 5 mg/L in deep layer (hypolimnion) and also mitigate DO supersaturation about 17% in surface layer (epilimnion). Key words: DO Improvement, Eutrophication, Stratification, Water Circulation, Water Quality Improvement
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