Extremely low frequency (0.1 to 1.0 mHz) surf zone currents.
Clark, David B.
MetadataShow full item record
Low‐frequency surf zone eddies disperse material between the shoreline and the continental shelf, and velocity fluctuations with frequencies as low as a few mHz have been observed previously on several beaches. Here spectral estimates of surf zone currents are extended to an order of magnitude lower frequency, resolving an extremely low frequency peak of approximately 0.5 mHz that is observed for a range of beaches and wave conditions. The magnitude of the 0.5‐mHz peak increases with increasing wave energy and with spatial inhomogeneity of bathymetry or currents. The 0.5‐mHz peak may indicate the frequency for which nonlinear energy transfers from higher‐frequency, smaller‐scale motions are balanced by dissipative processes and thus may be the low‐frequency limit of the hypothesized 2‐D cascade of energy from breaking waves to lower frequency motions.
Author Posting. © American Geophysical Union, 2019. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 46(3), (2019):1531-1536, doi:10.1029/2018GL081106.
The publisher requires that this item be embargoed until 2019-07-02. Please check back after 2019-07-02.
Suggested CitationArticle: Elgar, Steve, Raubenheimer, Britt, Clark, David B., Moulton, Melissa, "Extremely low frequency (0.1 to 1.0 mHz) surf zone currents.", Elgar, S., Raubenheimer, B., Clare, D. B., & Moulton, M. (2019). Extremely low frequency (0.1 to 1.0 mHz) surf zone currents. Geophysical Research Letters, 46(3), 1531-1536., DOI:10.1029/2018GL081106, https://hdl.handle.net/1912/24017
Showing items related by title, author, creator and subject.
Freshwater export from the Labrador Current to the North Atlantic Current at the Tail of the Grand Banks of Newfoundland Fratantoni, Paula S.; McCartney, Michael S. (2009-11)Historical hydrographic data, spanning the period 1896-2006, are used to examine the annual mean and seasonal variations in the distribution of freshwater along and across the shelf/slope boundary along the Labrador and ...
Sutherland, David A.; Pickart, Robert S. (2008-03-12)The subtidal circulation of the southeast Greenland shelf is described using a set of high-resolution hydrographic and velocity transects occupied in summer 2004. The main feature is the East Greenland Coastal Current ...
Subtidal current structure and variability of the continental shelf and slope of the northern South China Sea Tai, Jen-Hua; Yang, Kai-Chieh; Gawarkiewicz, Glen G. (Terrestrial, Atmospheric and Oceanic Sciences, 2017-06)The spatial structures and temporal variations in subtidal currents in the northern South China Sea (SCS) are quantified in this study using 20-day to 9-month measurements from eight acoustic Doppler current profiler ...