Spectra of velocity components over complex terrain

PANOFSKY, HA; Larko, D.; Lipschutz, R.; Stone, Greg; Bradley, E. F.; BROWN, AJ; Højstrup, Jørgen

doi:10.1256/smsqj.45512

Cited by 41 publications

(58 citation statements)

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“…Due to the low surface roughness, high heatstorage capacity and thermal inertia of water, the height of the inner boundary layer above the water surface is limited and characterised by small turbulence (Madany 1996). This turbulence of limited energy is conveyed inland along the mean velocity vectors of the wind (Panofsky et al 1982). Similar studies were conducted in marshy areas (Walter et al 2011).…”

Section: Introductionsupporting

confidence: 55%

Inclusion of Increased Air Turbulence Caused by Coke Production into Atmospheric Propagation Modelling

2018

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Gaussian plume models are still used in cases where short-distance, routine calculations have to be done. They use universal parameters to parameterise the atmospheric-and earth-surface impact on the dispersion of air pollutants that can produce satisfactory results in overall conditions. This is not the case in the place-specific applications, when standard models do not reflect all of the mechanisms involved in local dispersion phenomena. This limitation applies in particular to atypical objects which are characterised by high thermal and mechanical turbulence being introduced into the air. Such places form locally distinctive air turbulence reflected by specific vertical wind speed profiles. Based on the knowledge of their shape, the turbulence and diffusion intensity information may be transferred to the propagation model. The analysis of the wind profiles measured in the vicinity of the big coking plant is presented in this paper. The wind profiles' exponent values which had been obtained on this basis were compared with the values used with standard models. Also, measured marker-gas concentrations have been related to values calculated with the use of the model equipped with modified exponents as well as to the values obtained from the traditional model.

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Section: Introductionsupporting

confidence: 55%

Inclusion of Increased Air Turbulence Caused by Coke Production into Atmospheric Propagation Modelling

2018

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“…The K72 and M70 universal spectra and cospectra curves have been generally accepted as a standard for surface-layer measurements over land and ocean (e.g. Caughey, 1977;Kaimal, 1978;Schmitt et al, 1979;Panofsky et al, 1982;Smith and Chandler, 1987;Sorbjan, 1989;Drennan et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Spectral characteristics of turbulence in the hurricane boundary layer over the ocean between the outer rain bands

Zhang

2010

Q.J.R. Meteorol. Soc.

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“…In addition, using wind tunnel measurements Britter et al (1981) showed that streamwise turbulence intensity decreases with the distance to the top of the hill. Panofsky et al (1982) also found that, in adjusting to a changing surface, lower frequency power of the streamwise wind was reduced in the uphill direction only. Panofsky and Dutton (1984) explained that this is presumably due to horizontal divergence (dU/dx) in the upslope motions, which dampens eddy vorticity, and "smears out" the structure of the largest eddies.…”

Section: Power Spectrum and Integral Length Scale Of The Cross-streammentioning

confidence: 89%

Estimating the atmospheric boundary layer height over sloped, forested terrain from surface spectral analysis during BEARPEX

et al. 2011

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Abstract.The atmospheric boundary layer (ABL) height (z i ) over complex, forested terrain is estimated based on the power spectra and the integral length scale of cross-stream winds obtained from a three-axis sonic anemometer during the two summers of the BEARPEX (Biosphere Effects on Aerosol and Photochemistry) Experiment. The z i values estimated with this technique show very good agreement with observations obtained from balloon tether sondes (2007) and rawinsondes (2009) under unstable conditions (z/L < 0) at the coniferous forest in the California Sierra Nevada. On the other hand, the low frequency behavior of the streamwise upslope winds did not exhibit significant variations and was therefore not useful in predicting boundary layer height. The behavior of the nocturnal boundary layer height (h) with respect to the power spectra of the v-wind component and temperature under stable conditions (z/L > 0) is also presented. The nocturnal boundary layer height is found to be fairly well predicted by a recent interpolation formula proposed by Zilitinkevich et al. (2007), although it was observed to only vary from 60-80 m during the 2009 experiment in which it was measured. Finally, significant directional wind shear was observed during both day and night soundings. The winds were found to be consistently backing from the prevailing westsouthwesterlies within the ABL (the anabatic cross-valley circulation) to southerlies in a layer ∼1-2 km thick just above the ABL before veering to the prevailing westerlies further aloft. This shear pattern is shown to be consistent with the forcing of a thermal wind driven by the regional temperature gradient directed east-southeast in the lower troposphere.

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Spectra of velocity components over complex terrain

Cited by 41 publications

References 0 publications

Inclusion of Increased Air Turbulence Caused by Coke Production into Atmospheric Propagation Modelling

Inclusion of Increased Air Turbulence Caused by Coke Production into Atmospheric Propagation Modelling

Spectral characteristics of turbulence in the hurricane boundary layer over the ocean between the outer rain bands

Estimating the atmospheric boundary layer height over sloped, forested terrain from surface spectral analysis during BEARPEX

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