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- W2890147291 abstract "Intense sediment transport experiments were performed in a gravity driven open-channel flow with two sizes of non-spherical acrylic particles of diameter d p =1.0mm and d p =3.0 mm, and a maximum packing volumetric concentration of 0.55 m 3 /m 3 . Two flow conditions were adapted to ensure the same sediment transport regime for particle sizes as sheet flows (Shields numbers above unity) with an equi-repartition of the total net sediment transport rate between the suspended load and the bedload (Suspension number around unity). An acoustic scattering-based system, the Acoustic Concentration and Velocity Profiler (ACVP) and electric conductivity probes, the Conductivity Concentration Profiler (CCP) with two different vertical resolutions of 1mm (CCP 1mm ) and 2 mm (CCP 2mm ),were used to measure time-resolved and averaged concentration profiles across the bed-load and suspension layers. A detailed comparative analysis of concentration and sheet flow layer thickness measurements obtained with the two systems across both the suspension and the bedload layers is presented. The capabilities and limitations of the two flow measurement technologies are outlined. Average sediment concentration profiles were overestimated by 10% with the ACVP in the dense sheet layer when ⟨φ(z)⟩ ≳ 0.35, and by 100% with the CCP in the more diluted region when ⟨φ(z)⟩ ≲ 0.015 and ⟨φ(z)⟩ ≲ 0.20 for CCP 1mm and CCP 2mm , respectively. Good agreement is found elsewhere between the three systems in terms of average and time-resolved concentration as well as bed level position and sheet flow layer thickness." @default.
- W2890147291 created "2018-09-27" @default.
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- W2890147291 date "2018-01-01" @default.
- W2890147291 modified "2023-09-23" @default.
- W2890147291 title "On bedload measurement performances of high-resolution acoustic (ACVP) and conductivity (CCP) profilers" @default.
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- W2890147291 doi "https://doi.org/10.1051/e3sconf/20184004007" @default.
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