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February 22, 2026Japanese Journal of JSCE0 citations

Fundamental Study on Surface Fluctuations and Propagation in a Smooth Open Channel

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KIKazuki ITOTUTatsuhiko UCHIDAHMHitoshi MIYAMOTO

Key Points

  • The research aims to analyze how surface fluctuations in water relate to the characteristics of internal flow during floods.
  • Utilized simultaneous image measurement data from past studies in a smooth open channel.
  • Conducted spatiotemporal correlation analysis on surface fluctuations.
  • Performed proper orthogonal decomposition to extract dominant modes and structures.
  • Examined the spatial correlation between surface fluctuations and turbulent flow.
  • Identified significant changes in surface fluctuation patterns and propagation characteristics based on Froude number differences.
  • Observed high correlation near the water surface in jet flow areas, highlighting the close relationship between flow and surface fluctuations.
  • Demonstrated the physical link between surface fluctuations and internal flow structures.

Abstract

洪水時の流れを明らかにすることは重要であるが，激しい濁流となる洪水時の内部流況の正確な把握は困難である．近年では水面波紋の動画像から水表面流速を算出する画像計測手法が発達し，水面変動には内部流況の特徴が内包されると考えられる．本研究では，過去に滑面直線開水路で実施された水面・流速の同時画像計測データを用いて，流れにより変化する水面変動の形態と伝播特性を検討した．具体的には水面変動に対して時空間相関解析および固有直交分解を行い，時空間的な構造や支配モードを抽出した．さらに水面変動と乱れの空間相関解析から，内部流れ構造との物理的関係を調べた．その結果，フルード数の違いにより水面変動の形態と伝播特性が大きく変化し，射流場では水面近傍に高い相関が見られ，流れと水面変動が密接に関係することが示された．

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Cite This Study

ITO et al. (2026) studied this question.

synapsesocial.com/papers/699a9ca1482488d673cd26aahttps://doi.org/10.2208/jscejj.25-16166
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