A comparison of a Eulerian and a Lagrangian time scale for over-water atmospheric flows during stable conditions
โ Scribed by S. Sethuraman; R. E. Meyers; R. M. Brown
- Publisher
- Springer
- Year
- 1978
- Tongue
- English
- Weight
- 528 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0006-8314
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โฆ Synopsis
Lagrangian integral time scales were calculated from crosswind concentration distributions of oil-fog smoke released from a continuous point source over the ocean during stable atmospheric conditions assuming an exponential correlation function. Variance of the lateral velocity fluctuations, (~2, and the energy dissipation rate, E, were obtained from simultaneous Eulerian measurements at the beach. An Eulerian energy dissipation scale defined as @Z/E was then computed. The ratio of the Lagrangian integral scale to the Eulerian energy dissipation scale was found to be close to 1. This ratio was also estimated to be 1 based on physical and dimensional considerations regarding the cascade of energy. Length scales for longitudina1, lateral and vertical directions were interpreted with a model based on similarity considerations applicabIe for over-water atmospheric flows.
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