Errors in acoustic doppler profiler velocity measurements caused by flow disturbance

David S. Mueller, Jorge D. Abad, Carlos M. Garcia, Jeffrey W. Gartner, Marcelo H. Garcia, Kevin A. Oberg

Research output: Contribution to journalArticle

Abstract

Acoustic Doppler current profilers (ADCPs) are commonly used to measure streamflow and water velocities in rivers and streams. This paper presents laboratory, field, and numerical model evidence of errors in ADCP measurements caused by flow disturbance. A state-of-the-art three-dimensional computational fluid dynamic model is validated with and used to complement field and laboratory observations of flow disturbance and its effect on measured velocities. Results show that near the instrument, flow velocities measured by the ADCP are neither the undisturbed stream velocity nor the velocity of the flow field around the ADCP. The velocities measured by the ADCP are biased low due to the downward flow near the upstream face of the ADCP and upward recovering flow in the path of downstream transducer, which violate the flow homogeneity assumption used to transform beam velocities into Cartesian velocity components. The magnitude of the bias is dependent on the deployment configuration, the diameter of the instrument, and the approach velocity, and was observed to range from more than 25% at 5cm from the transducers to less than 1% at about 50cm from the transducers for the scenarios simulated.

Original languageEnglish (US)
Pages (from-to)1411-1420
Number of pages10
JournalJournal of Hydraulic Engineering
Volume133
Issue number12
DOIs
StatePublished - Dec 1 2007

Fingerprint

profiler
Velocity measurement
Acoustic Doppler Current Profiler
acoustics
Acoustics
disturbance
transducer
Transducers
Electric current measurement
computational fluid dynamics
Flow velocity
flow velocity
flow field
homogeneity
streamflow
Numerical models
Dynamic models
Flow fields
Computational fluid dynamics
transform

Keywords

  • Acoustic techniques
  • Computational fluid dynamics technique
  • Errors
  • Flow measurement
  • Numerical models
  • Velocity

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology
  • Mechanical Engineering

Cite this

Errors in acoustic doppler profiler velocity measurements caused by flow disturbance. / Mueller, David S.; Abad, Jorge D.; Garcia, Carlos M.; Gartner, Jeffrey W.; Garcia, Marcelo H.; Oberg, Kevin A.

In: Journal of Hydraulic Engineering, Vol. 133, No. 12, 01.12.2007, p. 1411-1420.

Research output: Contribution to journalArticle

Mueller, David S. ; Abad, Jorge D. ; Garcia, Carlos M. ; Gartner, Jeffrey W. ; Garcia, Marcelo H. ; Oberg, Kevin A. / Errors in acoustic doppler profiler velocity measurements caused by flow disturbance. In: Journal of Hydraulic Engineering. 2007 ; Vol. 133, No. 12. pp. 1411-1420.
@article{ff9b799e88c54cef95d82b35547de154,
title = "Errors in acoustic doppler profiler velocity measurements caused by flow disturbance",
abstract = "Acoustic Doppler current profilers (ADCPs) are commonly used to measure streamflow and water velocities in rivers and streams. This paper presents laboratory, field, and numerical model evidence of errors in ADCP measurements caused by flow disturbance. A state-of-the-art three-dimensional computational fluid dynamic model is validated with and used to complement field and laboratory observations of flow disturbance and its effect on measured velocities. Results show that near the instrument, flow velocities measured by the ADCP are neither the undisturbed stream velocity nor the velocity of the flow field around the ADCP. The velocities measured by the ADCP are biased low due to the downward flow near the upstream face of the ADCP and upward recovering flow in the path of downstream transducer, which violate the flow homogeneity assumption used to transform beam velocities into Cartesian velocity components. The magnitude of the bias is dependent on the deployment configuration, the diameter of the instrument, and the approach velocity, and was observed to range from more than 25{\%} at 5cm from the transducers to less than 1{\%} at about 50cm from the transducers for the scenarios simulated.",
keywords = "Acoustic techniques, Computational fluid dynamics technique, Errors, Flow measurement, Numerical models, Velocity",
author = "Mueller, {David S.} and Abad, {Jorge D.} and Garcia, {Carlos M.} and Gartner, {Jeffrey W.} and Garcia, {Marcelo H.} and Oberg, {Kevin A.}",
year = "2007",
month = "12",
day = "1",
doi = "10.1061/(ASCE)0733-9429(2007)133:12(1411)",
language = "English (US)",
volume = "133",
pages = "1411--1420",
journal = "Journal of Hydraulic Engineering",
issn = "0733-9429",
publisher = "American Society of Civil Engineers (ASCE)",
number = "12",

}

TY - JOUR

T1 - Errors in acoustic doppler profiler velocity measurements caused by flow disturbance

AU - Mueller, David S.

AU - Abad, Jorge D.

AU - Garcia, Carlos M.

AU - Gartner, Jeffrey W.

AU - Garcia, Marcelo H.

AU - Oberg, Kevin A.

PY - 2007/12/1

Y1 - 2007/12/1

N2 - Acoustic Doppler current profilers (ADCPs) are commonly used to measure streamflow and water velocities in rivers and streams. This paper presents laboratory, field, and numerical model evidence of errors in ADCP measurements caused by flow disturbance. A state-of-the-art three-dimensional computational fluid dynamic model is validated with and used to complement field and laboratory observations of flow disturbance and its effect on measured velocities. Results show that near the instrument, flow velocities measured by the ADCP are neither the undisturbed stream velocity nor the velocity of the flow field around the ADCP. The velocities measured by the ADCP are biased low due to the downward flow near the upstream face of the ADCP and upward recovering flow in the path of downstream transducer, which violate the flow homogeneity assumption used to transform beam velocities into Cartesian velocity components. The magnitude of the bias is dependent on the deployment configuration, the diameter of the instrument, and the approach velocity, and was observed to range from more than 25% at 5cm from the transducers to less than 1% at about 50cm from the transducers for the scenarios simulated.

AB - Acoustic Doppler current profilers (ADCPs) are commonly used to measure streamflow and water velocities in rivers and streams. This paper presents laboratory, field, and numerical model evidence of errors in ADCP measurements caused by flow disturbance. A state-of-the-art three-dimensional computational fluid dynamic model is validated with and used to complement field and laboratory observations of flow disturbance and its effect on measured velocities. Results show that near the instrument, flow velocities measured by the ADCP are neither the undisturbed stream velocity nor the velocity of the flow field around the ADCP. The velocities measured by the ADCP are biased low due to the downward flow near the upstream face of the ADCP and upward recovering flow in the path of downstream transducer, which violate the flow homogeneity assumption used to transform beam velocities into Cartesian velocity components. The magnitude of the bias is dependent on the deployment configuration, the diameter of the instrument, and the approach velocity, and was observed to range from more than 25% at 5cm from the transducers to less than 1% at about 50cm from the transducers for the scenarios simulated.

KW - Acoustic techniques

KW - Computational fluid dynamics technique

KW - Errors

KW - Flow measurement

KW - Numerical models

KW - Velocity

UR - http://www.scopus.com/inward/record.url?scp=36448946519&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=36448946519&partnerID=8YFLogxK

U2 - 10.1061/(ASCE)0733-9429(2007)133:12(1411)

DO - 10.1061/(ASCE)0733-9429(2007)133:12(1411)

M3 - Article

AN - SCOPUS:36448946519

VL - 133

SP - 1411

EP - 1420

JO - Journal of Hydraulic Engineering

JF - Journal of Hydraulic Engineering

SN - 0733-9429

IS - 12

ER -