Evaluation of Mean Velocity and Turbulence Measurements with ADCPs

dc.contributor.author Nystrom, Elizabeth
dc.contributor.author Rehmann, Chris
dc.contributor.author Oberg, Kevin
dc.contributor.department Civil, Construction and Environmental Engineering
dc.date 2018-02-18T01:55:35.000
dc.date.accessioned 2020-06-30T01:13:53Z
dc.date.available 2020-06-30T01:13:53Z
dc.date.issued 2007-01-01
dc.description.abstract <p>To test the ability of acoustic Doppler current profilers (ADCPs) to measure turbulence, profiles measured with two pulse-to-pulse coherent ADCPs in a laboratory flume were compared to profiles measured with an acoustic Doppler velocimeter, and time series measured in the acoustic beam of the ADCPs were examined. A four-beam ADCP was used at a downstream station, while a three-beam ADCP was used at a downstream station and an upstream station. At the downstream station, where the turbulence intensity was low, both ADCPs reproduced the mean velocity profile well away from the flume boundaries; errors near the boundaries were due to transducer ringing, flow disturbance, and sidelobe interference. At the upstream station, where the turbulence intensity was higher, errors in the mean velocity were large. The four-beam ADCP measured the Reynolds stress profile accurately away from the bottom boundary, and these measurements can be used to estimate shear velocity. Estimates of Reynolds stress with a three-beam ADCP and turbulent kinetic energy with both ADCPs cannot be computed without further assumptions, and they are affected by flow inhomogeneity. Neither ADCP measured integral time scales to within 60%.</p>
dc.description.comments <p>This is an article from <em>Journal of Hydraulic Engineering</em> 133 (2007), <a href="http://dx.doi.org/10.1061/(ASCE)0733-9429(2007)133:12(1310)" target="_blank">doi:10.1061/(ASCE)0733-9429(2007)133:12(1310)</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/ccee_pubs/90/
dc.identifier.articleid 1089
dc.identifier.contextkey 9433102
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ccee_pubs/90
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/14003
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/ccee_pubs/90/2007_Rehmann_EvaluationMean.pdf|||Sat Jan 15 02:26:49 UTC 2022
dc.source.uri 10.1061/(ASCE)0733-9429(2007)133:12(1310)
dc.subject.disciplines Civil and Environmental Engineering
dc.subject.disciplines Environmental Engineering
dc.subject.disciplines Hydraulic Engineering
dc.subject.keywords Acoustic techniques
dc.subject.keywords Experimentation
dc.subject.keywords Laboratory tests
dc.subject.keywords Reynolds stress
dc.subject.keywords Turbulence
dc.subject.keywords Velocity
dc.subject.keywords Wave measurement
dc.title Evaluation of Mean Velocity and Turbulence Measurements with ADCPs
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication c9df86ca-a14c-4adb-b45f-65c6153f7847
relation.isOrgUnitOfPublication 933e9c94-323c-4da9-9e8e-861692825f91
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