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Determination of surface stress from vertical-velocity spectra

✍ Scribed by D. Moravek; H. A. Panofsky; A. Weber

Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
255 KB
Volume
102
Category
Article
ISSN
0035-9009

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✦ Synopsis

Abstract

Many recent measurements of vertical‐velocity spectra in the atmospheric boundary layer are combined in order to derive the dependence of the maximum of the logarithmic spectrum, normalized by surface stress, on stability. An empirical equation is suggested which fits the observations and has the proper limiting form for free convection. It is suggested that this equation can be used to derive surface stresses from relatively simple measurements of the most energetic part of the spectrum, and from a stability parameter.

πŸ“œ SIMILAR VOLUMES

The spectrum of vertical velocity near t
The spectrum of vertical velocity near the surface
✍ H. A. Panofsky; R. A. McCormick πŸ“‚ Article πŸ“… 1960 πŸ› John Wiley and Sons 🌐 English βš– 494 KB

## Abstract Observations of a considerable number of vertical‐velocity spectra are combined to show that under near‐neutral and unstable conditions, the shape of the spectrum is essentially invariant up to heights of order 100 m, and the β€˜scale’ of turbulence is proportional to height within this r

Sensitivity of bed shear stress estimate
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Bed shear stress in open channel flows is often estimated from the logarithmic vertical velocity profile. However, most measuring devices used in the field do not allow for flow velocity to be measured very close to the bed. The lack of near-bed measurements is a critical loss of information which m