A s the 21st century begins, the issue of sustainable ecosystem management is providing humanity with one of its greatest challenges. The problem is particularly complex for freshwater systems, where humans and natural systems are inherently linked. Increasing water demands for an expanding human population competes with protecting aquatic ecosystems and ecological services (MEA 2005). Today, rivers and wetlands are among the most threatened ecosystems worldwide (Brinson and Malvarez 2002, Malmqvist and Rundle 2002, Tockner and Stanford 2002). As a consequence, restoration of rivers and wetlands has emerged as a worldwide phenomenon as well as a booming enterprise

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The purpose of this research is to examine the operation technique of the aeration circulation device that suits a local situation by the observations of the water temperature, the direction and velocity of the wind, etc. in the stratified dam reservoir.As a result, it was shown that the intrusion position by the aeration circulation is influenced by the water temperature distribution. Moreover, the flows of water in this reservoir was shown to have received the influence of wind driven flow, inflow and outflow strongly. Therefore, it was suggested that affected area by aeration can be wider if the aeration circulation device was operated referring to the flow of the reservoir that was presumed by the observations.

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