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Micrositing variability and mean flow scaling for marine turbulence in Ramsey Sound

Michael Togneri Orcid Logo, Ian Masters Orcid Logo

Journal of Ocean Engineering and Marine Energy, Volume: 2, Issue: 1, Pages: 35 - 46

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

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DOI (Published version): 10.1007/s40722-015-0036-0

Abstract

We present turbulence results from two acoustic Doppler current profiler measurement campaigns carried out in Ramsey Sound at two locations within 50mof one another. The first measurements were taken in 2009 and the second in 2011; both include a complete spring–neap cycle. In this paper we characte...

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Published in: Journal of Ocean Engineering and Marine Energy
ISSN: 2198-6444 2198-6452
Published: 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa23511
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spelling 2020-05-21T19:53:53.1874801 v2 23511 2015-09-29 Micrositing variability and mean flow scaling for marine turbulence in Ramsey Sound 7032d5a521c181cea18dbb759e1ffdeb 0000-0002-6820-1680 Michael Togneri Michael Togneri true false 6fa19551092853928cde0e6d5fac48a1 0000-0001-7667-6670 Ian Masters Ian Masters true false 2015-09-29 MECH We present turbulence results from two acoustic Doppler current profiler measurement campaigns carried out in Ramsey Sound at two locations within 50mof one another. The first measurements were taken in 2009 and the second in 2011; both include a complete spring–neap cycle. In this paper we characterise turbulence through turbulent kinetic energy (TKE) density and integral lengthscales and their relationships with one another and with mean flow parameters. We briefly describe the methods used to calculate these parameters. We find that a flood–ebb asymmetry is present in the data from both measurement campaigns, but although the flood tides are similar at both locations, the ebb tides are much more energetic in the 2011 data than the 2009 data. We suggest that this may be due to differences in seabed features between the two measurement locations. Dimensional analysis is employed to investigate how TKE scales with mean flow velocity; we find that the expected quadratic scaling is not well supported by the data at either measurement location. As a consequence, flows that have more energetic turbulence may instead appear to be less turbulent if judged by turbulence intensity. We investigate the correlation between lengthscales and TKE density and find that it is highly site-specific: it should not be assumed that for a given measurement location highly energetic turbulence is associated with larger flow structures or vice versa. Journal Article Journal of Ocean Engineering and Marine Energy 2 1 35 46 2198-6444 2198-6452 28 2 2016 2016-02-28 10.1007/s40722-015-0036-0 COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University 2020-05-21T19:53:53.1874801 2015-09-29T09:28:16.7404236 Michael Togneri 0000-0002-6820-1680 1 Ian Masters 0000-0001-7667-6670 2 0023511-20072016150754.pdf Togneri2015.pdf 2016-07-20T15:07:54.2800000 Output 1222140 application/pdf Version of Record true 2016-07-20T00:00:00.0000000 Released under the terms of a Creative Commons Attribution 4.0 International License (CC-BY). true eng http://creativecomm ons.org/licenses/by/4.0/
title Micrositing variability and mean flow scaling for marine turbulence in Ramsey Sound
spellingShingle Micrositing variability and mean flow scaling for marine turbulence in Ramsey Sound
Michael Togneri
Ian Masters
title_short Micrositing variability and mean flow scaling for marine turbulence in Ramsey Sound
title_full Micrositing variability and mean flow scaling for marine turbulence in Ramsey Sound
title_fullStr Micrositing variability and mean flow scaling for marine turbulence in Ramsey Sound
title_full_unstemmed Micrositing variability and mean flow scaling for marine turbulence in Ramsey Sound
title_sort Micrositing variability and mean flow scaling for marine turbulence in Ramsey Sound
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
Ian Masters
format Journal article
container_title Journal of Ocean Engineering and Marine Energy
container_volume 2
container_issue 1
container_start_page 35
publishDate 2016
institution Swansea University
issn 2198-6444
2198-6452
doi_str_mv 10.1007/s40722-015-0036-0
document_store_str 1
active_str 0
description We present turbulence results from two acoustic Doppler current profiler measurement campaigns carried out in Ramsey Sound at two locations within 50mof one another. The first measurements were taken in 2009 and the second in 2011; both include a complete spring–neap cycle. In this paper we characterise turbulence through turbulent kinetic energy (TKE) density and integral lengthscales and their relationships with one another and with mean flow parameters. We briefly describe the methods used to calculate these parameters. We find that a flood–ebb asymmetry is present in the data from both measurement campaigns, but although the flood tides are similar at both locations, the ebb tides are much more energetic in the 2011 data than the 2009 data. We suggest that this may be due to differences in seabed features between the two measurement locations. Dimensional analysis is employed to investigate how TKE scales with mean flow velocity; we find that the expected quadratic scaling is not well supported by the data at either measurement location. As a consequence, flows that have more energetic turbulence may instead appear to be less turbulent if judged by turbulence intensity. We investigate the correlation between lengthscales and TKE density and find that it is highly site-specific: it should not be assumed that for a given measurement location highly energetic turbulence is associated with larger flow structures or vice versa.
published_date 2016-02-28T03:27:43Z
_version_ 1763751036428746752
score 11.013148

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