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ESDU 83045:2012

$126.75

Strong Winds in the Atmospheric Boundary Layer – Part 2: Discrete Gust Speeds

Published By Publication Date Number of Pages
ESDU 2012-02-01 37
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ESDU 83045 gives a method for estimating the variation of the
expected maximum gust speed with height above the ground for any
gust averaging time greater than about 1 second. The method takes
into account the roughness of the site terrain and also any
roughness changes that occur upwind. The roughness of the terrain
affects the hourly-mean wind speed and its turbulence component.
Theoretical methods were used to account for these effects and the
results combined into a simplified method that is presented in the
form of convenient calculation sheets and equations for the data. A
gust factor approach is used to relate the maximum gust speed to
the corresponding hourly-mean wind speed given by ESDU 82026.The
gust factor dependence on averaging time is derived using the
spectral density of the fluctuating component of wind speed. The
approach assumes an extreme-value distribution that provides an
estimate of the maximum value of the fluctuating component and
hence the gust speed for any averaging time and time interval
within which the wind speed is observed. Gust factors derived using
this approach are presented graphically and in simplified equation
form. A practical worked example illustrates the use of the data.
The full methods for estimating the effects on gust speed of
terrain roughness changes, height above ground and averaging time
are built into the computer program VIEWpac E0108 described in ESDU
01008.

ESDU 83045:2012
$126.75