期刊
JOURNAL OF PHYSICAL OCEANOGRAPHY
卷 41, 期 11, 页码 2223-2241出版社
AMER METEOROLOGICAL SOC
DOI: 10.1175/2011JPO4344.1
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资金
- National Oceanic and Atmospheric Administration
- Singapore Stanford Program
- National Defense Science and Engineering Graduate Fellowship
- ARCS Foundation
- National Science Foundation [OCE-0622967, OCE- 0824972]
- Division Of Ocean Sciences
- Directorate For Geosciences [0824972] Funding Source: National Science Foundation
Results are presented from an observational study of stratified, turbulent flow in the bottom boundary layer on the outer southeast Florida shelf. Measurements of momentum and heat fluxes were made using an array of acoustic Doppler velocimeters and fast-response temperature sensors in the bottom 3 m over a rough reef slope. Direct estimates of flux Richardson number R-f confirm previous laboratory, numerical, and observational work, which find mixing efficiency not to be a constant but rather to vary with Fr-t, Re-b, and Ri(g). These results depart from previous observations in that the highest levels of mixing efficiency occur for Fr-t < 1, suggesting that efficient mixing can also happen in regions of buoyancy-controlled turbulence. Generally, the authors find that turbulence in the reef bottom boundary layer is highly variable in time and modified by near-bed flow, shear, and stratification driven by shoaling internal waves.
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