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Comparison of ADCP observations and 3D model simulations of turbulence at a tidal energy site

Michael Togneri Orcid Logo, Matt Lewis, Simon Neill, Ian Masters Orcid Logo

Renewable Energy, Volume: 114, Pages: 273 - 282

Swansea University Authors: Michael Togneri Orcid Logo, Ian Masters Orcid Logo

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DOI (Published version): 10.1016/j.renene.2017.03.061

Abstract

Field measurement of turbulence in strong tidal currents is difficult and expensive, but the tidal energy industry needs to accurately quantify turbulence for adequate resource characterisation and device design. Models that can predict such turbulence could reduce measurement costs. We compare a Re...

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Published in: Renewable Energy
ISSN: 0960-1481
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa32173
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spelling 2020-07-15T14:45:04.9864901 v2 32173 2017-02-28 Comparison of ADCP observations and 3D model simulations of turbulence at a tidal energy site 7032d5a521c181cea18dbb759e1ffdeb 0000-0002-6820-1680 Michael Togneri Michael Togneri true false 6fa19551092853928cde0e6d5fac48a1 0000-0001-7667-6670 Ian Masters Ian Masters true false 2017-02-28 MECH Field measurement of turbulence in strong tidal currents is difficult and expensive, but the tidal energy industry needs to accurately quantify turbulence for adequate resource characterisation and device design. Models that can predict such turbulence could reduce measurement costs. We compare a Regional Ocean Modelling System (ROMS) simulation with acoustic Doppler current profiler (ADCP) measurements from a highly-energetic tidal site. This comparison shows the extent to which turbulence can be quantified by ROMS, using the conventional k−ε turbulence closure model. Both model and observations covered the same time period, encompassing two spring-neap cycles. Turbulent kinetic energy (TKE) density was calculated from measurements using the variance method; turbulent dissipation, ε, was calculated using the structure function method. Measurements show that wave action dominates turbulent fluctuations in the upper half of the water column; comparing results for deeper water, however, shows very strong agreement. A best fit between ROMS and ADCP results for mean velocity yields R2=0.98; for TKE, R2 is 0.84 when strongly wave-dominated times are excluded. Dissipation agrees less well: although time series of ε are well-correlated at similar depths, ROMS estimates a greater magnitude of dissipation than is measured, by a factor of up to 4.8. Journal Article Renewable Energy 114 273 282 0960-1481 ADCP, ROMS, marine turbulence, TKE, turbulent dissipation, tidal power 31 12 2017 2017-12-31 10.1016/j.renene.2017.03.061 a. The author made a substantial contribution to the conception and design of the study;and to analysis and interpretation of study data.andb. The author drafted the output;Output has been reviewed with minor revisions and is awaiting final decision. COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University RCUK 2020-07-15T14:45:04.9864901 2017-02-28T11:16:08.3826239 Michael Togneri 0000-0002-6820-1680 1 Matt Lewis 2 Simon Neill 3 Ian Masters 0000-0001-7667-6670 4 0032173-05092017094924.pdf 1-s2.0-S0960148117302537Togneri.pdf 2017-09-05T09:49:24.2470000 Output 3411710 application/pdf Version of Record true 2017-09-05T00:00:00.0000000 This is an open access article under the CC BY license true eng https://creativecommons.org/licenses/by/4.0/
title Comparison of ADCP observations and 3D model simulations of turbulence at a tidal energy site
spellingShingle Comparison of ADCP observations and 3D model simulations of turbulence at a tidal energy site
Michael Togneri
Ian Masters
title_short Comparison of ADCP observations and 3D model simulations of turbulence at a tidal energy site
title_full Comparison of ADCP observations and 3D model simulations of turbulence at a tidal energy site
title_fullStr Comparison of ADCP observations and 3D model simulations of turbulence at a tidal energy site
title_full_unstemmed Comparison of ADCP observations and 3D model simulations of turbulence at a tidal energy site
title_sort Comparison of ADCP observations and 3D model simulations of turbulence at a tidal energy site
author_id_str_mv 7032d5a521c181cea18dbb759e1ffdeb
6fa19551092853928cde0e6d5fac48a1
author_id_fullname_str_mv 7032d5a521c181cea18dbb759e1ffdeb_***_Michael Togneri
6fa19551092853928cde0e6d5fac48a1_***_Ian Masters
author Michael Togneri
Ian Masters
author2 Michael Togneri
Matt Lewis
Simon Neill
Ian Masters
format Journal article
container_title Renewable Energy
container_volume 114
container_start_page 273
publishDate 2017
institution Swansea University
issn 0960-1481
doi_str_mv 10.1016/j.renene.2017.03.061
document_store_str 1
active_str 0
description Field measurement of turbulence in strong tidal currents is difficult and expensive, but the tidal energy industry needs to accurately quantify turbulence for adequate resource characterisation and device design. Models that can predict such turbulence could reduce measurement costs. We compare a Regional Ocean Modelling System (ROMS) simulation with acoustic Doppler current profiler (ADCP) measurements from a highly-energetic tidal site. This comparison shows the extent to which turbulence can be quantified by ROMS, using the conventional k−ε turbulence closure model. Both model and observations covered the same time period, encompassing two spring-neap cycles. Turbulent kinetic energy (TKE) density was calculated from measurements using the variance method; turbulent dissipation, ε, was calculated using the structure function method. Measurements show that wave action dominates turbulent fluctuations in the upper half of the water column; comparing results for deeper water, however, shows very strong agreement. A best fit between ROMS and ADCP results for mean velocity yields R2=0.98; for TKE, R2 is 0.84 when strongly wave-dominated times are excluded. Dissipation agrees less well: although time series of ε are well-correlated at similar depths, ROMS estimates a greater magnitude of dissipation than is measured, by a factor of up to 4.8.
published_date 2017-12-31T03:39:23Z
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score 11.037297

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