Variations in turbulent energy dissipation and water column stratification at the entrance of a tidally energetic strait |
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| Authors: | Shiho Kobayashi Eisuke Hashimoto Masayuki Nagao Yoshio Takasugi |
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| Institution: | (1) Tokyo University of Marine Science and Technology, Department of Ocean Sciences, 4-5-7 Konan, Minato-ku, Tokyo 108-8477, Japan;(2) Tokyo University of Marine Science and Technology, Research Center for Advanced Science and Technology, Tokyo, Japan;(3) Lake Biwa Environmental Research Institute, Ōtsu, Japan |
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| Abstract: | We observed tidal currents, turbulent energy dissipation and water column stratification at the entrance of a narrow strait
(Neko Seto) in the Seto Inland Sea, Japan, using a free-falling turbulent microstructure profiler (TurboMAP) and acoustic
Doppler current profiler (ADCP). The variation in turbulent energy dissipation at the entrance of the strait was not at quarter-diurnal
frequency but at semi-diurnal frequency; turbulent energy dissipation was enhanced during the ebb tide, although it was moderate
during the flood tide. This result is consistent with the results of Takasugi (1993), which showed the asymmetry of tidal
energy loss during a semidiurnal tidal cycle using control volume analysis. It is suggested that significant turbulent energy
dissipation is generated in the strait, which influences the properties of water outside the strait when tidal currents flow
out from the strait. |
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