Turbulence in the presence of internal waves in the bottom boundary layer of the California inner shelf
Turbulence measurements were collected in the bottom boundary layer of the California inner shelf near Point Sal, CA, for 2 months during summer 2015. The water column at Point Sal is stratified by temperature, and internal bores propagate through the region regularly. We collected velocity, temperature, and turbulence data on the inner shelf at a 30-m deep site. We estimated the turbulent shear production (P), turbulent dissipation rate (ε), and vertical diffusive transport (T), to investigate the near-bed local turbulent kinetic energy (TKE) budget. We observed that the local TKE budget showed an approximate balance (P ≈ ε) during the observational period, and that buoyancy generally did not affect the TKE balance. On a finer resolution timescale, we explored the balance between dissipation and models for production and observed that internal waves did not affect the balance in TKE at this depth.
KeywordsTurbulence Turbulent kinetic energy Bottom boundary Inner shelf Point Sal Inner Shelf Experiment Internal waves
Portions of this work were performed while Rachel M. Allen participated in the Naval Research Enterprise Internship Program at the U.S. Naval Research Laboratory. The authors are appreciative of the able Captain and crew of the R/V Oceanus for enabling the successful deployment and recovery of the instrumentation used in this work.
- Colosi JA, Kumar N, Suanda SH, et al (2017) Statistics of internal tide bores and internal solitary waves observed on the inner continental shelf off Point Sal, California. J Phys Oceanogr 48:123–143. https://doi.org/10.1175/JPO-D-17-0045.1
- Howard RJA, Serre E (2015) Large-eddy simulation in a mixing tee junction: high-order turbulent statistics analysis. Int J Heat Fluid Flow 51:65–77. https://doi.org/10.1016/j.ijheatfluidflow.2014.11.009 CrossRefGoogle Scholar
- Lamb KG (2014) Internal wave breaking and dissipation mechanisms on the continental slope/shelf. Annu Rev Fluid Mech 46:231–254. https://doi.org/10.1146/annurev-fluid-011212-140701 CrossRefGoogle Scholar
- Madsen OS (1994) Spectral wave-current bottom boundary layer flows. Coast Eng 94:384–397Google Scholar
- McDougall TJ, Barker PM (2011) Getting started with TEOS-10 and the Gibbs Seawater (GSW) Oceanographic Toolbox. SCOR/IAPSO WG127Google Scholar
- Ölçmen SM, Simpson RL (2008) Experimental transport-rate budgets in complex 3-D turbulent flow near a wing/body junction. Int J Heat Fluid Flow 29:874–890. https://doi.org/10.1016/j.ijheatfluidflow.2007.12.004 CrossRefGoogle Scholar
- Shaw WJ, Trowbridge JH (2001) The direct estimation of near-bottom turbulent fluxes in the presence of energetic wave motions. J Atmos Ocean Technol 18:1540–1557. https://doi.org/10.1175/1520-0426(2001)018<1540:TDEONB>2.0.CO;2 CrossRefGoogle Scholar
- Walter RK, Woodson CB, Arthur RS, et al (2012) Nearshore internal bores and turbulent mixing in southern Monterey Bay: internal bores and turbulent mixing. J Geophys Res Oceans 117. https://doi.org/10.1029/2012JC008115