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Influence of Sediment Mobility on Universal von Kármán Coefficient k and Traversing Length of Eddy in Fluvial Streams

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Abstract

Sediment mobility in stream corroborates many significant mechanisms in terms of interactions of transported particles in the carrier fluid flows. In general, the sediment entrainment in stream refers to temporal and continual motion of non-cohesive grains. This phenomenon significantly influences the near-bed turbulent flow characteristics in streams. Laboratory experiments were conducted in a rectangular open-channel flume of 15 m long, 0.90 m wide and 0.75 m deep fitted with side glass walls and the study is concerned with the determination of von Kármán coefficient with non-cohesive bed-load to strive the eddy traversing length, sizes and TKE dissipation rate close to the bed. Two modes of experimental conditions are considered: (1) immobile-bed with no sediment transport known as clear-water flows; and (2) continuous weak bed-load sediment transport, without bed-forms development refer to a mobile-bed flows. In both cases, the sediment beds should remain flat and hydraulically rough. The experimental result reveals that the von Kármán coefficient goes down in the traditional log-law of wall in mobile-bed streams with respect to the flow over an immobile bed. A close observation in sediment mobility due to bed load transport shows the reduction in traversing length of an eddy and increment in near-bed eddy size. The increment in near-bed eddy sizes are attributed to the reduction in turbulent kinetic energy dissipation rate close to the stream bed.

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  1. Department of Civil Engineering, National Institute of Technology Agartala, Tripura, India

    Das Ratul

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Das Ratul Influence of Sediment Mobility on Universal von Kármán Coefficient k and Traversing Length of Eddy in Fluvial Streams. Water Resour 47, 222–230 (2020). https://doi.org/10.1134/S0097807820020153

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