Comment on 'Using an ADCP to Estimate Turbulent Kinetic Energy Dissipation Rate in Sheltered Coastal Waters'
| Autor: | Ann E. Gargett |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Length scale
Atmospheric Science 010504 meteorology & atmospheric sciences 010505 oceanography Turbulence Isotropy Stratification (water) Ocean Engineering Geophysics Dissipation 01 natural sciences Physics::Fluid Dynamics Eddy Turbulence kinetic energy 14. Life underwater Physics::Atmospheric and Oceanic Physics Taylor microscale Geology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Atmospheric and Oceanic Technology. 34:1387-1390 |
| ISSN: | 1520-0426 0739-0572 |
| DOI: | 10.1175/jtech-d-16-0091.1 |
| Popis: | Greene et al. revisit the suggestion that the turbulent kinetic energy dissipation rate could be estimated through a “large-eddy estimate,” employing acoustic measurements of velocity fields associated with the largest energy-containing scales of ocean turbulence. While the large-eddy estimate as originally proposed used vertical velocity and a vertical eddy length scale, Greene et al. chose instead to substitute a horizontal length scale for the latter. This comment argues that combining a horizontal scale for length with a vertical velocity scale produces a large-eddy estimate of the dissipation rate that is accurate only if the energy-containing eddies are isotropic, and that this condition is highly unlikely in naturally occurring ocean turbulence, subject as it is to influences of stratification, vertical shear, and/or the presence of horizontal boundaries. The problem is documented using data from a large-eddy simulation of Langmuir supercells. |
| Databáze: | OpenAIRE |
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