Proper orthogonal decomposition of two vertical profiles of full-scale nonstationary downburst wind speeds[lzcl]

Chen, L.; Letchford, Chris

doi:10.1016/j.jweia.2004.11.004

Cited by 79 publications

(13 citation statements)

References 26 publications

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“…22 and 21, respectively. As shown in these figures, the constant, C w , generally decreases with the increase of the height, which agrees with the findings by Chen and Letchford (2005). It is found that the constant C w is of the order of 10 at the location of the maximum mean velocities, i.e.…”

Section: Turbulent Correlations In the Narrow Frequency Bandsupporting

confidence: 91%

Turbulence characterization of downbursts using LES

Aboshosha

Bitsuamlak

Damatty

2015

Journal of Wind Engineering and Industrial Aerodynamics

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Section: Turbulent Correlations In the Narrow Frequency Bandsupporting

confidence: 91%

Turbulence characterization of downbursts using LES

Aboshosha

Bitsuamlak

Damatty

2015

Journal of Wind Engineering and Industrial Aerodynamics

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“…According to this, convective wind events are not included in the present wind load standards of buildings and structures, which so far have been based solely on the characteristics of synoptically driven wind gusts in the near-surface boundary layer (e.g., DIN EN 1991-1-4:2010ASCE, 2010). However, convective and turbulent gusts differ considerably concerning vertical wind-speed profiles, the gust factor describing the turbulence (i.e., maximum to mean wind speed), or exceedance probability curves (Wood et al, 2001;Holmes, 2002;Chen and Letchford, 2005).…”

Section: Introductionmentioning

confidence: 99%

Statistical characteristics of convective wind gusts in Germany

Mohr

Kunz

Richter

et al. 2017

Nat. Hazards Earth Syst. Sci.

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Abstract. Due to the small-scale and non-stationary nature of the convective wind gusts usually associated with thunderstorms, there is a considerable lack of knowledge regarding their characteristics and statistics. In an effort to remedy this situation, we investigated in this study a set of 110 climate stations of the German Weather Service between 1992 and 2014 to analyze the temporal and spatial distribution, intensity, and occurrence probability of convective gusts.Similar to thunderstorm activity, the frequency of convective gusts decreases gradually from southern to northern Germany. No further spatial structures, such as a relation to orography or climate conditions, can be identified regarding their strength or likelihood. Rather, high wind speeds of above 30 m s −1 can be expected everywhere in Germany with almost similar occurrence probabilities. A comparison of the 20-year return values of convective gusts with those of turbulent gusts demonstrates that the latter have higher frequencies, especially in northern Germany. However, for higher return periods, this effect can be reversed at some stations.The values of the convective gust factors are mainly in a range between 1 and 4 but can even reach values up to 10. Besides the dependency from the averaging time period of the mean wind, the values of the gust factors additionally depend on the event duration and the storm type, respectively.

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“…Deaves and Harris (1978), Peil and Nolle (1992) and Cook (1997), and also on thunderstorms, e.g. Choi (2000) and Chen and Letchford (2005). However, only a few fullscale data are available on wind speed profiles up to a high altitude, say 500 m or more.…”

Section: Introductionmentioning

confidence: 99%