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Title: Hydrodynamic characteristics and related mass-transfer properties in open-channel flows with rectangular embayment zone
Authors: Sanjou, Michio  kyouindb  KAKEN_id  orcid (unconfirmed)
Nezu, Iehisa
Author's alias: 山上, 路生
Keywords: Side cavity
Open-channel flow
Mass transfer
Issue Date: Dec-2013
Publisher: Springer Netherlands
Journal title: Environmental Fluid Mechanics
Volume: 13
Issue: 6
Start page: 527
End page: 555
Abstract: Consecutive groynes and embayments form dead water zones, where sedimentation and high concentrations of pollutants are often observed. It is thus very important to understand the mass and momentum exchange between the main channel and side cavities in rivers and hydraulic engineering structures. The spanwise gradient of the streamwise velocity near the junction produces small-scale turbulent vortices because of shear instability. Furthermore, large-scale horizontal circulation is also generated in the cavity zone. These coherent turbulent structures play a significant role in mass and sediment transfer at the boundary between the mainstream and embayment. However, the relation between turbulence and mass transfer is poorly understood. In this study, we performed particle image velocity and laser-induced fluorescence experiments using a laboratory flume, laser light sheets and a high-speed CMOS camera. We examined the exchange properties of a dye as a function of bed configuration and sedimentation effect. Both primary and secondary gyres were observed in the flat bed and downward-sloping bed, whereas the primary gyre was prevalent in the upward-sloping bed. Moreover, the horizontal circulation strongly affected the mass-transfer properties between the mainstream and side cavity.
Rights: The final publication is available at Springer via
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1007/s10652-013-9279-2
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