Acoustic measurement of suspended sediment concentration profiles in an oscillatory boundary layer

Francisco Pedocchi; Marcelo H. García

doi:10.1016/j.csr.2011.05.013

Acoustic measurement of suspended sediment concentration profiles in an oscillatory boundary layer

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Abstract

The use of an Ultrasonic Velocity Profiler (UVP) to obtain phase-averaged velocity and turbulent Reynolds stress profiles inside an oscillatory boundary layer flow is described in detail and possible error sources are summarized. Since the instrument also reports the acoustic backscatter, a novel application of the same ultrasound profilers to obtain phase-averaged suspended sediment concentration profiles and the errors involved in this technique are carefully discussed. The experiments were performed in the Large Oscillatory Water-Sediment Tunnel (LOWST), which has been a recent addition to the experimental facilities of the Ven Te Chow Hydrosystems Laboratory at the University of Illinois at Urbana-Champaign. The results showed that for the selected transducer frequency and flow, the instrument ability to characterize turbulence is compromised by the presence of Doppler noise and the size of the sampling volume. Regarding the suspended sediment estimation, it was found that the calibration obtained using water samples yielded good results, allowing for the study of the suspended sediment evolution along the oscillation.

Original language	English (US)
Pages (from-to)	87-95
Number of pages	9
Journal	Continental Shelf Research
Volume	46
DOIs	https://doi.org/10.1016/j.csr.2011.05.013
State	Published - Sep 1 2012

Keywords

Oscillatory flow
Suspended sediment
Ultrasonic Velocity Profiler

ASJC Scopus subject areas

Oceanography
Aquatic Science
Geology

Online availability

10.1016/j.csr.2011.05.013

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title = "Acoustic measurement of suspended sediment concentration profiles in an oscillatory boundary layer",

abstract = "The use of an Ultrasonic Velocity Profiler (UVP) to obtain phase-averaged velocity and turbulent Reynolds stress profiles inside an oscillatory boundary layer flow is described in detail and possible error sources are summarized. Since the instrument also reports the acoustic backscatter, a novel application of the same ultrasound profilers to obtain phase-averaged suspended sediment concentration profiles and the errors involved in this technique are carefully discussed. The experiments were performed in the Large Oscillatory Water-Sediment Tunnel (LOWST), which has been a recent addition to the experimental facilities of the Ven Te Chow Hydrosystems Laboratory at the University of Illinois at Urbana-Champaign. The results showed that for the selected transducer frequency and flow, the instrument ability to characterize turbulence is compromised by the presence of Doppler noise and the size of the sampling volume. Regarding the suspended sediment estimation, it was found that the calibration obtained using water samples yielded good results, allowing for the study of the suspended sediment evolution along the oscillation.",

keywords = "Oscillatory flow, Suspended sediment, Ultrasonic Velocity Profiler",

author = "Francisco Pedocchi and Garc{\'i}a, {Marcelo H.}",

note = "Funding Information: The authors would like to thank Juan E. Martin for his help with the preliminary evaluation of the UVP and several suggestions about this work. Thanks to Jeffrey W. Gartner for his comments on an early draft of the manuscript. Also thanks to Blake Landry and David Admiraal for reviewing the manuscript. This work was done under Grant N00014-05-1-0083 from the Coastal Geosciencies Program of the U.S. Office of Naval Research . The LOWST was built and instrumented with the ONR DURIP grants N00014-01-1-0540 and N00014-06-1-0661 . ",

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AU - Pedocchi, Francisco

AU - García, Marcelo H.

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Y1 - 2012/9/1

N2 - The use of an Ultrasonic Velocity Profiler (UVP) to obtain phase-averaged velocity and turbulent Reynolds stress profiles inside an oscillatory boundary layer flow is described in detail and possible error sources are summarized. Since the instrument also reports the acoustic backscatter, a novel application of the same ultrasound profilers to obtain phase-averaged suspended sediment concentration profiles and the errors involved in this technique are carefully discussed. The experiments were performed in the Large Oscillatory Water-Sediment Tunnel (LOWST), which has been a recent addition to the experimental facilities of the Ven Te Chow Hydrosystems Laboratory at the University of Illinois at Urbana-Champaign. The results showed that for the selected transducer frequency and flow, the instrument ability to characterize turbulence is compromised by the presence of Doppler noise and the size of the sampling volume. Regarding the suspended sediment estimation, it was found that the calibration obtained using water samples yielded good results, allowing for the study of the suspended sediment evolution along the oscillation.

AB - The use of an Ultrasonic Velocity Profiler (UVP) to obtain phase-averaged velocity and turbulent Reynolds stress profiles inside an oscillatory boundary layer flow is described in detail and possible error sources are summarized. Since the instrument also reports the acoustic backscatter, a novel application of the same ultrasound profilers to obtain phase-averaged suspended sediment concentration profiles and the errors involved in this technique are carefully discussed. The experiments were performed in the Large Oscillatory Water-Sediment Tunnel (LOWST), which has been a recent addition to the experimental facilities of the Ven Te Chow Hydrosystems Laboratory at the University of Illinois at Urbana-Champaign. The results showed that for the selected transducer frequency and flow, the instrument ability to characterize turbulence is compromised by the presence of Doppler noise and the size of the sampling volume. Regarding the suspended sediment estimation, it was found that the calibration obtained using water samples yielded good results, allowing for the study of the suspended sediment evolution along the oscillation.

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Acoustic measurement of suspended sediment concentration profiles in an oscillatory boundary layer

Abstract

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