Using ADV backscatter strength for measuring suspended cohesive sediment concentration

Ha, Ho Kyung; Hsu, Wen Yang; Maa, Jerome P.‐Y.; Shao, Yuyang; Holland, Charles W.

doi:10.1016/j.csr.2009.03.001

Cited by 72 publications

(53 citation statements)

References 19 publications

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“…While the ADV is designed to record the instantaneous velocity components, the signal strength, or acoustic backscatter strength, may be related to the instantaneous suspended sediment concentration (SSC) with proper calibration (Kawanisi andYokosi 1997, Fugate andFriedrichs 2002). Although the method was initially developed for non-cohesive sediments, it was recently extended successfully to cohesive materials (Chanson et al 2008, Ha et al 2009). The calibration of the ADV was accomplished by measuring the signal amplitude of known, artificially produced concentrations of material obtained from the bed material sample, diluted in tap water and thoroughly mixed.…”

Section: Sediment Propertiesmentioning

confidence: 99%

High-frequency turbulence and suspended sediment concentration measurements in the Garonne River tidal bore

Chanson

Reungoat

Simon

et al. 2011

Estuarine, Coastal and Shelf Science

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The study details new sediment concentration measurements associated with some turbulence characterisation conducted at high frequency in the undular tidal bore of the Garonne River (France). Acoustic Doppler velocimetry was used, and the suspended sediment concentration was deduced from the acoustic backscatter intensity. The field data set demonstrated some unique flow features of the tidal bore including some large and rapid turbulent velocity fluctuations during and after the bore passage. Some unusually high suspended sediment concentration was observed about 100 s after the tidal bore front lasting for more than 10 minutes. It is thought that the tidal bore passage scoured the bed and convected upwards the bed material, reaching the free-surface after the bore passage. Behind the tidal bore, the net sediment flux magnitude was 30 times larger than the ebb tide net flux and directed upstream. A striking feature of the data set was the intense mixing and suspended sediment motion during the tidal bore and following flood tide. This feature has been rarely documented.

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Section: Sediment Propertiesmentioning

confidence: 99%

High-frequency turbulence and suspended sediment concentration measurements in the Garonne River tidal bore

Chanson

Reungoat

Simon

et al. 2011

Estuarine, Coastal and Shelf Science

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“…Typical instrumentation include ex situ bench scale devices comprising separate transmitter and receiver probes [33][34][35], and even recent interest in B-scan ultrasound imaging [36]. In situ transceiver devices utilizing Doppler shift measurements provide improved flexibility, such as the ultrasonic velocity profiler which employs only a single frequency [37,38], while point profiling can be conducted via acoustic Doppler velocimetry [39,40] and large dilute depths via the acoustic Doppler current profiler [41,42]. Furthermore, related acoustic backscatter systems (ABS) offer the capability of employing multiple frequencies, and enable minimally intrusive true in situ depth profiling of suspensions without specific sample size requirements [43,44].…”

Section: Introductionmentioning

confidence: 99%

In situ characterisation of a concentrated colloidal titanium dioxide settling suspension and associated bed development: Application of an acoustic backscatter system

et al. 2015

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. eait.dean@uq.edu.au (S.Biggs). T.N.Hunter@leeds.ac.uk (T.N. Hunter).1 Present address: University of Queensland, Brisbane, Qld 4072, Australia 2 AbstractThe ability to accurately characterise the settling of particulate suspensions is imperative in numerous industries for improved processing, optimisation and control. Characterisation is typically a non-trivial process, and in situ measurements that remove the restriction of requiring particular sample sizes are preferred. Here for the first time, we explore the use of an acoustic backscatter system (ABS) to characterise key settling dynamics within a common colloidal mineral suspension, where backscatter attenuation is heightened due to the associated low scattering cross sections of the particles. Settling titanium dioxide dispersions with concentrations ranging 0.05 -3.00 vol% were successfully profiled using ABS transducers of 1, 2 and 4 MHz frequencies. This approach enabled the simultaneous visualisation of both the settling interface and sediment bed formation, generating sedimentation curves and eluding settling velocities. Furthermore, backscatter attenuation was empirically correlated with the attenuation-concentration relationship established for homogenous dispersions, to obtain concentration profiles of the settling suspensions. The data depicted concentration changes as a function of time in a hindered settling suspension, and allowed observation of the segregation of a size polydisperse suspension. Data were compared with sedimentation data obtained via two common ex situ bench-scale techniques. Critically, the acoustic backscatter method was validated as a powerful in situ characterisation tool for opaque concentrated heterogeneous dispersions, with the ability to provide concentration density information in conjunction with settling kinetics that is not easily attainable via other methods.

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“…The results indicated a decreasing signal amplitude with increasing SSC, linked with some signal attenuation previously observed in cohesive materials at high concentrations (Fig. 4) (Ha et al 2009, Chanson et al 2012). …”

Section: Introductionmentioning

confidence: 59%

Turbulence and Suspended Sediment Measurements in an Urban Environment during the Brisbane River Flood of January 2011

Brown

Chanson

2013

J. Hydraul. Eng.

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Using ADV backscatter strength for measuring suspended cohesive sediment concentration

Cited by 72 publications

References 19 publications

High-frequency turbulence and suspended sediment concentration measurements in the Garonne River tidal bore

High-frequency turbulence and suspended sediment concentration measurements in the Garonne River tidal bore

In situ characterisation of a concentrated colloidal titanium dioxide settling suspension and associated bed development: Application of an acoustic backscatter system

Turbulence and Suspended Sediment Measurements in an Urban Environment during the Brisbane River Flood of January 2011

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