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The Bottom Boundary Layer
John H Trowbridge1, Steven J Lentz2
1Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA;
The oceanic bottom boundary layer plays a crucial role in coastal environments. Understanding its turbulence is key to predicting near-bottom substance transport and benthic processes.
Area of Science:
- Oceanography
- Fluid Dynamics
- Coastal Science
Background:
- The oceanic bottom boundary layer (OBBL) is a critical interface influencing energy, momentum, and substance transport.
- It is influenced by diverse forcing mechanisms including winds, waves, tides, and stratification.
Purpose of the Study:
- To review the state of knowledge regarding the coastal oceanic bottom boundary layer.
- To highlight advancements in understanding turbulence and its measurement within the OBBL.
Main Methods:
- Review of classical turbulence concepts and modern parameterizations.
- Analysis of data from modern sensors enabling direct/near-direct flux measurements.
Main Results:
- Classical and modern turbulence models accurately represent OBBL structure and fluxes when assumptions are met.
- Advanced sensors facilitate high-quality measurements of turbulent fluxes and dissipation rates.
Conclusions:
- Accurate modeling and measurement of OBBL turbulence are achievable.
- This understanding is vital for predicting coastal processes and benthic interactions.
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