Relationship between Separation Vortices Generated by Bottom Roughness and Water Surface Fluctuation

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  • 底面粗度による剥離渦発生と水面変動の関係について
  • テイメンソド ニ ヨル ハクリウズ ハッセイ ト スイメン ヘンドウ ノ カンケイ ニ ツイテ

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Abstract

Water surface fluctuations in river flows are caused by various factors such as wind effects, near-surface turbulence, or collision of boil vortices against water surface. When we view the river surface from a riverbank, such effects can be recognized as a surface image pattern moving with the flow, which can be utilized for non-contact surface flow measurement. Although plenty of research has been performed regarding open-channel turbulence, the effect of the bottom roughness on water surface fluctuations has not been investigated intensively so far. In this study, an open-channel flow with strip roughness is measured by PIV and the relationship between the flow near the bottom and water surface is investigated with the aid of the POD filtering technique.

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