EXPERIMENTAL STUDY ON BAR FORMATION UNDER UNSTEADY FLOW CONDITIONS
EXPERIMENTAL STUDY ON BAR FORMATION UNDER UNSTEADY FLOW CONDITIONS
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非定常流动条件下棒材形成的实验研究
DOI：
10.2208/prohe.46.725
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Fumiaki Oyama
中科院分区：
文献类型：
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作者：
Yasuharu Watanabe;Kôji Sato;Fumiaki Oyama
在以往关于具有有限振幅的沙床稳定性以及交错沙坝增长的研究中，假定由于非恒定流导致的水流随时间的变化不会影响交错沙坝的形成。本文进行了非恒定流条件下交错沙坝形成的水力学实验。由于洪水波的影响，非恒定流与恒定流条件之间以及水位上升和下降阶段之间，交错沙坝的波长和波高存在显著差异。非恒定性是交错沙坝实际形成条件的典型特征，尤其是对于砾石河床河流。研究结果表明，在研究非恒定流条件下交错沙坝的行为时，洪水波对交错沙坝形成的有限振幅影响不可忽略。
In the previous researches on the sand bed stability with finite amplitude and growth of alternate bars, it is assumed that flow changes over time due to the unsteady flow do not affect the generation of alternate bars. Hydraulic experiments on the formation of alternate bars under unsteady flow conditions are conducted in this paper. The wavelength and wave height of alternate bars differ significantly between unsteady and steady flow conditions and between rising and falling stage of the water level due to the flood wave. Unsteadiness is typical of actual formative conditions for alternate bars, especially for gravel bed rivers. Results suggest that finite amplitude effects of the flood-wave on alternate bar formation are not negligible when investigating their behavior under unsteady flow conditions.