Application of acoustics for measuring nearbed sediment processes: an integrated approach

Thorne, Peter D.; Hardcastle, P.J.; Bell, Paul S.

doi:10.1109/oceans.1998.725784

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…The working principle of ADVP has been detailed previously Hurther and Lemmin 1998;Thorne et al 1998;Shen and Lemmin 1999;Stanton and Thornton 1999; T. P. Stanton, "Bistatic Doppler velocity and sediment profiler device for measuring sediment concentration, estimates profile of mass flux from the product of mass concentration and three component velocity vector, US Sec of Navy," Patent No. US6262942-B1 (2001); Zedel and Hay 2002].…”

Section: Advp: Working Principle and State Of The Artmentioning

confidence: 99%

Measuring Bedload Sediment Transport with an Acoustic Doppler Velocity Profiler

2017

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International audienceAcoustic Doppler velocity profilers (ADVP) measure the velocity simultaneously in a linear array of bins. They have been successfully used in the past to measure three-dimensional turbulent flow and the dynamics of suspended sediment. The capability of ADVP systems to measure bedload sediment flux remains uncertain. The main outstanding question relates to the physical meaning of the velocity measured in the region where bedload sediment transport occurs. The main hypothesis of the paper, that the ADVP measures the velocity of the moving bedload particles, is validated in laboratory experiments that range from weak to intense bedload transport. First, a detailed analysis of the raw return signals recorded by the ADVP reveals a clear footprint of the bedload sediment particles, demonstrating that these are the main scattering sources. Second, time-averaged and temporal fluctuations of bedload transport derived from high-speed videography are in good agreement with ADVP estimates. Third, ADVP based estimates of bedload velocity and thickness of the bedload layer comply with semi-theoretical expressions based on previous results. An ADVP configuration optimized for bedload measurements is found to perform only marginally better than the standard configuration for flow measurements, indicating that the standard ADVP configuration can be used for sediment flux investigations. Data treatment procedures are developed that identify the immobile-bed surface, the layers of rolling/sliding and saltating bedload particles, and the thickness of the bedload layer. Combining ADVP measurements of the bedload velocity with measurements of particle concentration provided by existing technology would provide the sediment flux

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