caa a22 4500 445874775 CHVBK 20180317145524.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s10652-011-9210-7 doi (NATIONALLICENCE)springer-10.1007/s10652-011-9210-7 Turbulence structure and coherent vortices in open-channel flows with wind-induced water waves [Elektronische Daten] [Michio Sanjou, Iehisa Nezu] When wind-induced water waves appear over the free-surface flows such as natural rivers and artificial channels, large amounts of oxygen gas and heat are transported toward the river bed through the interface between water and wind layers. In contrast, a bed region is a kind of turbulent boundary layer, in which turbulence generation and its transport is promoted by the production of bed shear stress. In particular, coherent hairpin vortices, together with strong ejection events toward the outer part of the layer, promote mass and momentum exchanges between the inner and outer layers. It is inferred that such a near-bed turbulence may be influenced significantly by these air-water interfacial fluctuations accompanied with free-surface velocity shear and wind-induced water waves. However, these wind effects on the wall-turbulence structure are less understood. To address these exciting and challenging topics, we conducted particle imagery velocimetry (PIV) measurements in open-channel flows combined with air flows, and furthermore the present measured data allows us to investigate the effects of air-water interactions on turbulence structure through the whole depth region. Springer Science+Business Media B.V., 2011 Turbulence structure nationallicence Coherent motion nationallicence Hairpin vortex nationallicence Wind-induced water waves nationallicence Sanjou Michio Department of Civil Engineering, Kyoto University, Katsura Campus, 615-8540, Kyoto, Japan aut Nezu Iehisa Department of Civil Engineering, Kyoto University, Katsura Campus, 615-8540, Kyoto, Japan aut Environmental Fluid Mechanics Springer Netherlands 11/2(2011-04-01), 113-131 1567-7419 11:2<113 2011 11 10652 https://doi.org/10.1007/s10652-011-9210-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10652-011-9210-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sanjou Michio Department of Civil Engineering, Kyoto University, Katsura Campus, 615-8540, Kyoto, Japan aut NATIONALLICENCE 700 1- Nezu Iehisa Department of Civil Engineering, Kyoto University, Katsura Campus, 615-8540, Kyoto, Japan aut NATIONALLICENCE 773 0- Environmental Fluid Mechanics Springer Netherlands 11/2(2011-04-01), 113-131 1567-7419 11:2<113 2011 11 10652 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer