Abstract
In a closed water body, covered water surface reduces a wind impact which can provide dissolved oxygen in the water, due to a reduction of acting water surface by wind. This covered surface impact might suggest some important issues for water quality management in a closed water body. In this research, in order to clarify an impact of covered water surface on wind characteristics and dissolved oxygen supply by wind, wind tunnel test tank experiments were conducted. As a result, correlation between mass transfer coefficient and both wind friction velocity and Schmidt number were elucidated and quantitative expressions for the coverage impact were developed by using these correlations. In addition, the impact of the surface coverage was summarized by estimation formula of mass transfer coefficient.
