The impact of floating water plants on wind-induced flow and wind wave in a closed water area

Akinori Ozaki, Kunihiko Hamagami, Ken Mori, Eiji Inoue, Tomokazu Haraguchi

Research output: Contribution to conferencePaperpeer-review


In some closed water bodies, the fluids are generally stratified based on vertical density differences. The causes of density these differences can be categorized as being due to temperature, salt levels, and turbidity. In addition, the dynamics of water environmental substances are induced by wind-induced turbulence, which is based on mechanical disturbances, and convective flow, which is based on thermal disturbances. Wind-induced flow and wind waves are produced when mechanical disturbances act on the water surface. These effects in turn generate a lowering of the density interface and increases in the upper layer density based on mixing between upper- and lower-layer fluids, which is commonly referred to as an entrainment phenomenon. This entrainment phenomenon greatly affects the dynamics of water quality in a closed water body. The production of turbulent energy at the water surface and its transport towards the interface play an important role in the dynamics of water environmental substances. When the surface of a closed water body is partially covered with floating water plants, it is considered that wind waves and wind current based on wind action body affected by the plants to some extent, especially in small reservoirs and creeks, which have less surface area for the wind to acts on. We have previously reported that the value of entrainment velocity decreases as the coverage rate of floating water plants increases. It is considered that the covered water surface cause a reduction in the turbulent energy produced by wind shear. It is therefore important to clarify the effects of floating water plants on the wind-induced flow and wind waves generated by wind shear. Accordingly we experimentally considered the turbulent characteristics of wind-induced flow and wind waves in a closed water body with floating water plants. The results indicate that the energy of wind-induced flow is affected by the existence of floating water plants and that the energy decrease as the covereage rate of floating water plants increases.

Original languageEnglish
Number of pages13
Publication statusPublished - 2004
EventASAE Annual International Meeting 2004 - Ottawa, ON, Canada
Duration: Aug 1 2004Aug 4 2004


OtherASAE Annual International Meeting 2004
CityOttawa, ON

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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