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Response of Reynolds stresses and scaling behavior of high-order structure functions to a water-worked gravel-bed surface and its implication on sediment transport

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International Journal of Sediment Research 2022年第1期37卷 1-13页

作者： Nadia Penna Ellora Padhi Subhasish Dey Roberto Gaudio Dipartimento di Ingegneria Civile Università Della Calabria Department of Civil Engineering Shiv Nadar University Department of Civil Engineering Indian Institute of Technology Kharagpur

The aim of this experimental study is to investigate the interaction between turbulent flow and a gravelbed that mimics the actual roughness structures of a natural bed and its implication on sediment *** particular,the response of the Reynolds stresses and the role of intermittency to the bed roughness is the primary focus of the current *** this end,the flow field,measured with an Acoustice Doppler Velocimeter (ADV),is thoroughly examined,considering the conditional Reynolds shear stresses and the high-order structure functions of *** study results show that the features and the roughness structure of the water-worked gravel-bed (WWGB) have a strong impact on bursting *** reason for this is attributed to the flow layer above the crest in the WWGBs being primarily affected by sweep events rather than ejection events,although the latter events are prevalent in this flow layer in an immobile,man-made,*** coherent structures,which are primarily responsible for sediment transport,also are the key cause of the presence of an intermittency excess that breaks the Kolmogorov self-similarity hypothesis,leading to multi-fractal behavior of the velocity structure functions.

关键词： water-worked bed Turbulent flow Sweeps Ejections High-order structure functions

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