A note on vertical coherence of wind measured in an urban boundary layer

Brook, R. R.

doi:10.1007/bf00232250

Cited by 9 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This suggests that the rela~onshi~s indicated by Figures 1-3 are valid up to heights we11 above 20 m. Shiotani and Iwatani fitted a power faw to their observations; however this has the disadvantage that a, goes to zero at great height for fixed AZ. Equations (3) and (4) do not disagree with earlier estimates by the authors cited and by Brook (1975).…”

Section: Analysis Of Decay Constants Ucontrasting

confidence: 28%

Vertical coherence and phase delay between wind components in strong winds below 20 m

Bowen

Flay

Panofsky

1983

Boundary-Layer Meteorol

View full text Add to dashboard Cite

Vertical coherence and phase delay between wind components in strong winds in the lowest 20 m over uniform terrain in New Zealand have been analysed. The vertical decay constants and slopes for the horizontal wind components could be described as linear functions of the ratio of vertical spacing to mean height (AZ/~), with relatively little scatter. The decay constants for the lateral were smaller than for the lon~tudinal components, the slopes larger for the lateral components, as found previously.The coherence of vertical velocity is best described by exponential decay functions multiplied by a parameter which decreases linearly from 1 (for AZ/Z = 0) to 0.5 (for AZ/Z = 1). The decay constants increased linearly with AZ/Z, as in the case of the horizontal components. There were no significant phase differences for the vertical components.Lateral and vertical decay constants for the longitudinal wind component could be fitted to identical functions of Ay/z and AZ/Z, respectively.

show abstract

Section: Analysis Of Decay Constants Ucontrasting

confidence: 28%

Vertical coherence and phase delay between wind components in strong winds below 20 m

Bowen

Flay

Panofsky

1983

Boundary-Layer Meteorol

View full text Add to dashboard Cite

show abstract

“…2013). We refer to these papers for details beyond the short overview provided coherence of various velocity components in tower micrometeorological data (Davenport, 1961a;Panofsky and Singer, 1965;Pielke and Panofsky, 1971;Naito and Kondo, 1974;Panofsky et al, 1974;Brook, 1975;Seginer and Mulhearn, 1978;Kanda and Royles, 1978;Soucy et al, 1982;Bowen et al, 1983;Saranyasoontorn et al, 2004), investigations including the lateral/spanwise coherence (Kristensen and Jensen, 1979;Ropelewski et al, 1973;Panofsky and Mizuno, 1975;Perry et al, 1978;Kristensen, 1979;Kristensen et al, 1981;Schlez and Infield, 1998), the coherence of temperature fluctuations (Davison, 1976) and even meso-scale applications (typically in the horizontal directions) (Hanna and Chang, 1992;Woods et al, 2011;Vincent et al, 2013;Larsén et al, 2013;Mehrens et al, 2016). Together, these measurements cover a great variety of terrain and topography.…”

Section: Comparing Davenport's Hypothesis Tomentioning

confidence: 99%

Vertical Coherence of Turbulence in the Atmospheric Surface Layer: Connecting the Hypotheses of Townsend and Davenport

Krug

Baars

Hutchins

et al. 2019

Boundary-Layer Meteorol

View full text Add to dashboard Cite

Statistical descriptions of coherent flow motions in the atmospheric boundary layer have many applications in the wind engineering community. For instance, the dynamical characteristics of large-scale motions in wall-turbulence play an important role in predicting the dynamical loads on buildings, or the fluctuations in the power distribution across wind farms. Davenport (Quarterly a seminal study on the subject and proposed a hypothesis that is still widely used to date. Here, we demonstrate how the empirical formulation of Davenport is consistent with the analysis of Baars et al. (Journal of Fluid Mechanics, 2017, Vol. 823, R2) in the spirit of Townsend's attached-eddy hypothesis in wall turbulence. We further study stratification effects based on two-point measurements of atmospheric boundary-layer flow over the Utah salt flats. No self-similar scaling is observed in stable conditions, putting the application of Davenport's framework, as well as the attached eddy hypothesis, in question for this case. Data obtained under unstable conditions exhibit clear self-similar scaling and our analysis reveals a strong sensitivity of the statistical aspect ratio of coherent structures (defined as the ratio of streamwise and wall-normal extent) to the magnitude of the stability parameter.

show abstract

“…For a special observation example, Brook (1975) the case of whether the ramp is associated or not. Accordingly the value of A03 is 12*2 and 19*5 for two regions respectively.…”

Section: Characteristics Of Eddy Coherence and Phase Shift 421 Vertmentioning

confidence: 99%

“…Shiotani (1969 and1975) observed gusty winds such as typhoons over a long period at a 150m observation tower on the coast, and investigated the features of land and sea breezes, the vertical profile of space correlation coefficient and eddy slope.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Three-Dimensional Space Structure of Turbulent Eddy in the Atmospheric Boundary Layer Above the Ocean

Naito¹

1982

Journal of the Meteorological Society of Japan

View full text Add to dashboard Cite

show abstract

A note on vertical coherence of wind measured in an urban boundary layer

Cited by 9 publications

References 6 publications

Vertical coherence and phase delay between wind components in strong winds below 20 m

Vertical coherence and phase delay between wind components in strong winds below 20 m

Vertical Coherence of Turbulence in the Atmospheric Surface Layer: Connecting the Hypotheses of Townsend and Davenport

Three-Dimensional Space Structure of Turbulent Eddy in the Atmospheric Boundary Layer Above the Ocean

Contact Info

Product

Resources

About