Turbulent structure in a closed density stratified water body with floating vegetation
2007
Ozaki, A.(Kyushu Univ., Fukuoka (Japan). Faculty of Agriculture) | Hamagami, K. | Mori, K. | Hirai, Y.
A contributing factor on a water quality issue in a closed water body is in a sedimentation and a deposition of pollutants due to a domination of flow stagnation. Therefore, with regard to the preservation and improvement of the water quality in the water body, it is important to understand the response of the fluid to thermal and mechanical turbulences. Furthermore, when we consider the use of floating vegetation as a purification technique to improve the water quality, it is also important to elucidate the effect of the luxuriant growth of floating vegetation on the properties of the fluid. In the present study, in order to elucidate the wind-induced fluid movement in a closed water body where floating vegetation was in luxuriant growth on water surface, we conducted hydraulic experiments on density stratification with wind-induced flow using wind tunnel test tank and we experimentally considered the effect of coverage of floating vegetation on fluid movement that is induced by wind action on the water surface. The results indicated that the production of turbulent energy was controlled by luxuriant growth of floating vegetation on the water surface and the energy used for the mixture between upper and lower layers at the density interface was decreased. This mechanism could be explained by using the concept of turbulent energy balance.
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