LABORATORY STUDY ON LARGE HORIZONTAL VORTICES IN COMPOUND OPEN CHANNEL FLOW

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  • 直線複断面開水路流れに発生する大規模水平渦列の安定性と運動量輸送に関する実験的研究
  • チョクセン フクダンメン カイスイロ ナガレ ニ ハッセイスル ダイキボ スイ

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Abstract

It has been known that shear instability generates large horizontal vortices at the junctions of a main channel and flood plains in two- stage channel. A series of laboratory tests were performed by varying the main channel width, and the tests were conducted for 3 cases of water depth. Fluid velocity and water surface elevation were measured by using laser-Doppler velocimetry and capacity- type wave gage, respectively. It was found that two arrays of vortex streets become very stable at b/H=5, in which b is main channel width and H is main channel depth. The Reynolds stress at the junction shows a peak value at b/H=5 for all cases of water depth. The wavelength of vortices was predicted successfully in terms of linear shear instability analysis.

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