Tidally Driven Processes Leading to Near-Field Turbulence in a Channel at the Crest of the Mendocino Escarpment

Public Deposited

Downloadable Content

Download PDF


Attribute NameValues
  • In situ observations of tidally driven turbulence were obtained in a small channel that transects the crest of the Mendocino Ridge, a site of mixed (diurnal and semidiurnal) tides. Diurnal tides are subinertial at this latitude, and once per day a trapped tide leads to large flows through the channel giving rise to tidal excursion lengths comparable to the width of the ridge crest. During these times, energetic turbulence is observed in the channel, with overturns spanning almost half of the full water depth. A high-resolution, nonhydrostatic, 2.5-dimensional simulation is used to interpret the observations in terms of the advection of a breaking tidal lee wave that extends from the ridge crest to the surface and the subsequent development of a hydraulic jump on the flanks of the ridge. Modeled dissipation rates show that turbulence is strongest on the flanks of the ridge and that local dissipation accounts for 28% of the energy converted from the barotropic tide into baroclinic motion.
  • Keywords: Circulation/ Dynamics, Atm/Ocean Structure/Phenomena, Wave breaking, Tides, Topographic effects, Internal waves, Mixing
Resource Type
Date Available
Date Issued
  • Musgrave, R. C., MacKinnon, J. A., Pinkel, R., Waterhouse, A. F., & Nash, J. (2016). Tidally Driven Processes Leading to Near-Field Turbulence in a Channel at the Crest of the Mendocino Escarpment. Journal of Physical Oceanography, 46(4), 1137-1155. doi:10.1175/JPO-D-15-0021.1
Journal Title
Journal Volume
  • 46
Journal Issue/Number
  • 4
Academic Affiliation
Rights Statement
Funding Statement (additional comments about funding)
  • RCM is funded by the Office of Naval Research under Grant ONR N00014-12-1-0943 and by the National Science Foundation under Grant NSF OCE 1129763.
Peer Reviewed



This work has no parents.