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Shin S.,KAIST | Lee S.,Division 5 Technology | Lee S.,KAIST | Yum K.,Water Resources Corporation K water | Park H.,KAIST
Water Science and Technology

This study aims to improve the design factors of air diffuser systems that have been analyzed in laboratory experiments with consideration of the field conditions of dam reservoirs. In this study the destratification number (D N) destratification radius and efficiency are considered as design factors. The computational fluid dynamics (CFD) simulation experiment is performed in diverse field conditions in order to analyze these factors. The results illustrate the wider range of D N values in field conditions and the relationship of the destratification radius and efficiency to D N. The results can lead to better performance of air diffuser systems and water quality management in dam reservoir sites. © IWA Publishing 2012. Source

Lee S.,GS Engineering and Construction | Lee S.,KAIST | Kim S.H.,k-Technology | Park H.,KAIST | And 2 more authors.
Environmental Engineering Science

This study examined critical factors related to the short-term variation of algae growth in reservoirs during the summer. To this end, statistical tests were carried out at a small dam reservoir to determine how chemical factors (e.g., nutrient concentrations) and physical factors (e.g., theoretical and relative residence times, temperature) influenced the chlorophyll a (Chl-a) concentration. Statistical tests revealed that, although phosphorus (P) concentration was significant for Chl-a, residence time had much stronger relationship to Chl-a concentration than chemical factors. In addition, the study verified that relative residence time (RRT) best explained the relation of water status to algae growth. RRT was found to be useful in identifying water status related to the summer algae bloom. Finally, this study raised the possibility of inhibiting summer algae growth by operating dam reservoirs moderately. These findings need to be seriously considered when reservoir operators establish effective strategies for water quality management in summer. © Copyright 2012, Mary Ann Liebert, Inc. Source

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