In situ measurements of turbulent dissipation rate over an algal reef

Zhi Cheng Huang, Wu Ting Tsai

研究成果: 書貢獻/報告類型會議論文篇章同行評審

摘要

In situ measurements of wind, waves, current, and turbulence over an algal reef off the northwest coast of Taiwan are presented. Surface waves and flow velocities were measured by pressure sensors and wave gauges and by acoustic Doppler velocimetries (ADVs), respectively. Turbulence dissipation rate ε was estimated by fitting turbulence spectra in the inertial subrange. Under a minimum wave breaking condition, the observed ε over the algal reefs ranged from 10-6to 10-3(m2s-3), which is much higher than that reported in the literature for sandy beaches, and is higher than that for unidirectional flows over the fringing coral reefs at Red Sea. The values are comparable to the recent observations over the shallow coral-reef lagoon around Lady Elliot Island (LEI) [Huang et al., 2012]. In the present study site, both the wave-induced flow and the tidal current contribute to the turbulent dissipation rate in contrast wave dominating process in LEI. The classic wall-layer scaling for the observed friction velocity and the turbulence dissipation rate is found to be inapplicable to the bottom boundary layer within the shallow waters over the algal reef in the presence of tidal currents and waves.

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主出版物標題Proceedings of the 23rd International Offshore and Polar Engineering Conference, ISOPE 2013
頁面1334-1341
頁數8
出版狀態已出版 - 2013
事件23rd International Offshore and Polar Engineering Conference, ISOPE 2013 - Anchorage, AK, United States
持續時間: 30 6月 20135 7月 2013

出版系列

名字Proceedings of the International Offshore and Polar Engineering Conference
ISSN(列印)1098-6189
ISSN(電子)1555-1792

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???event.eventtypes.event.conference???23rd International Offshore and Polar Engineering Conference, ISOPE 2013
國家/地區United States
城市Anchorage, AK
期間30/06/135/07/13

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