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• W2589564840 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 571:207-220 (2017) - DOI: https://doi.org/10.3354/meps12098 Measurement of sardine-generated turbulence in a large tank Mamoru Tanaka1, Takeyoshi Nagai1, Tomonari Okada2, Hidekatsu Yamazaki1,* 1Faculty of Marine Science, Tokyo University of Marine Science and Technology, Minato, Tokyo 108-8477, Japan 2Coastal, Marine and Disaster Prevention Department, National Institute for Land and Infrastructure Management, Yokosuka, Kanagawa 239-0826, Japan *Corresponding author: hide@kaiyodai.ac.jp ABSTRACT: While swimming organisms may cause turbulence, it is not clear how strong the turbulence is and if eddies are large enough to mix stratified water columns. We conducted an observational experiment in a large aquarium tank containing several thousand Japanese sardines Sardinops melanostictus. Turbulence data were collected from inside the sardine school using a turbulence microstructure profiler. The averaged turbulent kinetic energy dissipation rate was 2.3 × 10-4 W kg-1 inside the school, while the averaged background value was 6.7 × 10-6 W kg-1. The school displayed fast and non-continuous ‘avoidance behavior’, or fast and long-lasting ‘feeding behavior’ during the measurements. A noticeable difference between the 2 behaviors was found in turbulent shear spectra: the avoidance behavior spectra showed a power decline in comparison with the Nasmyth empirical spectrum in the inertial sub-range, but the feeding behavior spectra exhibited no power decline, even in the inertial sub-range. In the latter case, the sardine school imparted kinetic energy into scales larger than the average individual body size of 0.173 m. This result is a counter-example to a general hypothesis that swimming organisms cannot impart kinetic energy at scales larger than their individual body size. KEY WORDS: Biomixing · Sardinops melanostictus · Aquarium experiment · Turbulent mixing Full text in pdf format Supplementary material PreviousNextCite this article as: Tanaka M, Nagai T, Okada T, Yamazaki H (2017) Measurement of sardine-generated turbulence in a large tank. Mar Ecol Prog Ser 571:207-220. https://doi.org/10.3354/meps12098 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 571. Online publication date: May 17, 2017 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2017 Inter-Research." @default.
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• W2589564840 title "Measurement of sardine-generated turbulence in a large tank" @default.
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