A laboratory investigation on the advection of free surface fluctuations in turbulent open-channel flows

研究成果: Conference contribution

抜粋

The advection characteristics of both water surface fluctuations and turbulence in turbulent open-channel flows were experimentally examined in this paper. We used a simultaneous image measurement method to obtain instantaneous velocity vectors and the corresponding water surface profiles in a vertical cross section of the open-channel. Time series of the water surface profiles indicated that the water surface fluctuations were propagated with a constant advection velocity in each experimental case. The space-time correlation analysis of the water surface fluctuations and turbulence disclosed that the advection velocity of the water surface fluctuations was always smaller than the mean bulk velocity, while that of the turbulence above the near-bed region was the same as the mean velocity, well-known as Taylor's hypothesis of the frozen-turbulence approximation. It was also found that the ratio of the advection velocity of the water surface fluctuations to the mean bulk velocity became smaller as the Froude number decreased.

元の言語English
ホスト出版物のタイトルProceedings of the International Conference on Fluvial Hydraulics - River Flow 2006
出版者Taylor and Francis/ Balkema
ページ119-124
ページ数6
ISBN(印刷物)9780415408158
DOI
出版物ステータスPublished - 2006 1 1
外部発表Yes
イベントInternational Conference on Fluvial Hydraulics - River Flow 2006 - Lisbon, Portugal
継続期間: 2006 9 62006 9 8

出版物シリーズ

名前Proceedings of the International Conference on Fluvial Hydraulics - River Flow 2006
1

Conference

ConferenceInternational Conference on Fluvial Hydraulics - River Flow 2006
Portugal
Lisbon
期間06/9/606/9/8

ASJC Scopus subject areas

  • Water Science and Technology

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  • これを引用

    Miyamoto, H. (2006). A laboratory investigation on the advection of free surface fluctuations in turbulent open-channel flows. : Proceedings of the International Conference on Fluvial Hydraulics - River Flow 2006 (pp. 119-124). (Proceedings of the International Conference on Fluvial Hydraulics - River Flow 2006; 巻数 1). Taylor and Francis/ Balkema. https://doi.org/10.1201/9781439833865.ch10