Turbulence and chronic detachment of epilithic biofilm in artificial rough channel flow

Hirai, Yasuyuki; Kawamura, Satomi; Shimizu, Yasutaka; Kimura, Ichirô

doi:10.1201/b10553-132

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…Recently, permeable groynes are proposed to realize stable bed condition. For example, Kadota & Suzuki (2010) discussed several effects of the permeability and the scales of the groynes and stone gabion in submerged and emerged flow conditions. They conducted laboratory measurements in open-channel flows with alone groyne model over movable bed, and compared bed configurations varying groyne length and gabion size systematically.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic characteristics and related mass-transfer properties in open-channel flows with rectangular embayment zone

Sanjou

Nezu

2013

Environ Fluid Mech

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Consecutive groins and embayment form dead water zones, where sedimentation and congestion of pollutants are often observed. It is thus very important to reveal mass and momentum exchanges between main-channel and side-cavity in river environment and hydraulic engineering. There exists spanwise gradient of streamwise velocity near the junction, and it produces small-scale turbulent vortices owing to shear instability. Furthermore, large-scale horizontal circulations are also generated in the cavity zone. These coherent turbulent structures play significant roles on mass and sediment transfers through a mainstream / embayment boundary. However, the relation between the turbulence and mass transfers is still poorly understood. In the present study, PIV and LIF measurements are conducted in a laboratory flume using a laser light sheets and high-speed CMOS camera, and we compared exchange properties of dye concentration and effects of sedimentation on them among different bed configurations. The both of primary gyre and secondary one are observed in the flat-bed and downward slope conditions, and in contrast, the primary gyre is prevalent in the upward slope condition. It was found that these formations of the horizontal circulations have striking impacts on the mass transfer properties between the mainstream and the side-cavity.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic characteristics and related mass-transfer properties in open-channel flows with rectangular embayment zone

Sanjou

Nezu

2013

Environ Fluid Mech

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show abstract

“…Recently, permeable groynes are proposed to realize stable bed condition. For example, Kadota & Suzuki (2010) discussed experimentally effects of the permeability and the scales of the groynes and stone gabion in submerged and emerged flow conditions. Tominaga & Sakaki (2010) conducted ADV measurements around the permeable groynes in a natural river, and they evaluated distributions of bed shear stress accurately.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Effects of Sedimentation on Mass Transport Properties in Dead Water Zone of Natural Rivers

Sanjou¹

2011

Sediment Transport in Aquatic Environments

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Hydrodynamic Effects of Bed Configuration in Embayment on Flow Patterns and Related Turbulence Transport in Open-Channel Flows With Side Cavity Zone

Sanjou¹,

Nezu²,

Suzuki³

et al. 2012

J. JSCE

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Turbulence and chronic detachment of epilithic biofilm in artificial rough channel flow

Cited by 3 publications

References 1 publication

Hydrodynamic characteristics and related mass-transfer properties in open-channel flows with rectangular embayment zone

Hydrodynamic characteristics and related mass-transfer properties in open-channel flows with rectangular embayment zone

Hydrodynamic Effects of Sedimentation on Mass Transport Properties in Dead Water Zone of Natural Rivers

Hydrodynamic Effects of Bed Configuration in Embayment on Flow Patterns and Related Turbulence Transport in Open-Channel Flows With Side Cavity Zone

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