EFFECT OF STABLE DENSITY STRATIFICATION SECONDARY FLOW IN COMPOUND CHANNEL

Flow measurements were undertaken in a compound channel to investigate the effect of stratification on secondary flow in two-layer density-stratified flow. Secondary flow and salinity were measured using a laser induced fluorescence technique together with a laser Doppler anemometer system. Flow vis...

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Bibliographic Details
Published inPROCEEDINGS OF HYDRAULIC ENGINEERING Vol. 45; pp. 535 - 540
Main Authors ISHIGAKI, Taisuke, SHIONO, Koji, FENG, Tong, SIQUEIRA, Renato N.
Format Journal Article
LanguageEnglish
Published Japan Society of Civil Engineers 2001
Subjects
compound channel flow
LDA
secondary flow
stratification
Visualization
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Summary:Flow measurements were undertaken in a compound channel to investigate the effect of stratification on secondary flow in two-layer density-stratified flow. Secondary flow and salinity were measured using a laser induced fluorescence technique together with a laser Doppler anemometer system. Flow visualisation was also carried out using a digital video camera to demonstrate the effect of stratification on flow. The measured data shows that the size of typical twin vortices in the compound channel reduces as the degree of stratification increases. Two generation mechanisms of secondary flow were recognized on the floodplain, namely non-isotropic turbulence driven secondary flow and density driven secondary flow. The production of turbulent kinetic energy due to buoyancy was found to be not significant in most region but is significant in the water surface region
ISSN:0916-7374
1884-9172
DOI:10.2208/prohe.45.535