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Role of turbulence fluctuations on uncertainties of acoutic Doppler current profiler discharge measurements

Water Resources Research

By:
, , ,
DOI: 10.1029/2011WR011185

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Abstract

This work presents a systematic analysis quantifying the role of the presence of turbulence fluctuations on uncertainties (random errors) of acoustic Doppler current profiler (ADCP) discharge measurements from moving platforms. Data sets of three-dimensional flow velocities with high temporal and spatial resolution were generated from direct numerical simulation (DNS) of turbulent open channel flow. Dimensionless functions relating parameters quantifying the uncertainty in discharge measurements due to flow turbulence (relative variance and relative maximum random error) to sampling configuration were developed from the DNS simulations and then validated with field-scale discharge measurements. The validated functions were used to evaluate the role of the presence of flow turbulence fluctuations on uncertainties in ADCP discharge measurements. The results of this work indicate that random errors due to the flow turbulence are significant when: (a) a low number of transects is used for a discharge measurement, and (b) measurements are made in shallow rivers using high boat velocity (short time for the boat to cross a flow turbulence structure).

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Role of turbulence fluctuations on uncertainties of acoutic Doppler current profiler discharge measurements
Series title:
Water Resources Research
DOI:
10.1029/2011WR011185
Volume
48
Year Published:
2012
Language:
English
Publisher:
American Geophysical Union
Publisher location:
Washington, D.C.
Contributing office(s):
Office of Surface Water
Description:
12 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
W06507
Number of Pages:
31