Evaluation of a triple-axis coherent Doppler velocity profiler for measuring near-bed turbulent flow: a field study

Betteridge, K. F. E.; Bell, P. S. ORCID: https://orcid.org/0000-0002-4673-4822; Thorne, P. D. ORCID: https://orcid.org/0000-0002-4261-0937; Williams, J. J.. 2006 Evaluation of a triple-axis coherent Doppler velocity profiler for measuring near-bed turbulent flow: a field study. Journal of Atmospheric and Oceanic Technology, 23 (1). 90-106. https://doi.org/10.1175/JTECH1834.1

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Abstract/Summary

Collocated detailed measurements of near-bed turbulent and intrawave flow are important for studying sediment transport processes and seabed evolution. Existing commercially available triple-axis profiling instruments do not provide collocated velocity measurements. To improve the capability to make such measurements a triple-axis coherent Doppler velocity profiler (CDVP) has been developed and tested in the marine environment. The instrument was designed to measure orthogonal velocity profiles within a narrow column of water at 16 Hz within 1 m of the bed with a vertical spatial resolution of 0.05 m. This paper describes the first deployment of the instrument, in a tidal inlet in Portugal during a multidisciplinary study, when CDVP flow velocity measurements were compared with data from other instrumentation. A pragmatic approach was adopted to assess the capability of the triple-axis CDVP, using both an evaluation of internal consistency and an assessment against two commercially available acoustic Doppler velocimeters (ADVs). Measurements of the mean and fluctuating velocity profiles were collected with the triple-axis CDVP, and these have been shown to be internally consistent and to be in good agreement with measurements obtained with the ADVs.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1175/JTECH1834.1
Programmes:	Other/Admin
ISSN:	0739-0572
Format Availability:	Electronic, Print
Additional Keywords:	TURBULENCE MEASUREMENTS, SEDIMENT PROCESSES, FLUX
NORA Subject Terms:	Marine Sciences
Date made live:	01 Aug 2007 13:54 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/523

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1175/JTECH1834.1

Programmes:

Other/Admin

ISSN:

0739-0572

Format Availability:

Electronic, Print

Additional Keywords:

TURBULENCE MEASUREMENTS, SEDIMENT PROCESSES, FLUX