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

研究成果: Conference contribution

抄録

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
ページ119-124
ページ数6
1
出版物ステータスPublished - 2006
外部発表Yes
イベントInternational Conference on Fluvial Hydraulics - River Flow 2006 - Lisbon
継続期間: 2006 9 62006 9 8

Other

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

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open channel flow
advection
surface water
turbulence
Froude number
measurement method
laboratory
cross section
time series

ASJC Scopus subject areas

  • Water Science and Technology

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 (巻 1, pp. 119-124)

A laboratory investigation on the advection of free surface fluctuations in turbulent open-channel flows. / Miyamoto, Hitoshi.

Proceedings of the International Conference on Fluvial Hydraulics - River Flow 2006. 巻 1 2006. p. 119-124.

研究成果: Conference contribution

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. 巻. 1, pp. 119-124, International Conference on Fluvial Hydraulics - River Flow 2006, Lisbon, 06/9/6.
Miyamoto H. 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. 巻 1. 2006. p. 119-124
Miyamoto, Hitoshi. / 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. 巻 1 2006. pp. 119-124
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