Converting Wind Averaging Speeds
Converting Wind Averaging Speeds
(OP)
I'm looking for some references or advice to help me convert between fastest mile, mean hourly, 3 second gust etc. Does anyone know of any good sources of information that explain how to do these conversions?






RE: Converting Wind Averaging Speeds
These curves can be conveniently used for converting the hourly mean speed (Vmh) and the fastest mile wind speed (Vfm) to 3-second gust speed (V3s) and vice versa.
Try this link for durst, krayer-marshall graph (A little more than 1/2 way through the paper):
http://www.bbsr.edu/rpi/meetpart/paper/landmain.html
Example of conversion:
Conversion of hourly mean speed of 80 mph to 1-second and 3 second gust speeds.
Hourly mean speed = V3600. From the graph, read the value of Vt/V3600 on the y-axis for t = 1 second on the x-axis. Note that t = 1 second lies at the origin of the durst curve. this value is 1.57 (approx). Therefore,
V1s/V3600 = 1.57, whence V1s = 1.57 mh = 1.57(80) = 125.6 mph.
Similarly, for t = 3 seconds on x-axis we read Vt/V3600 = 1.53 (approx) on the y-axis.
Therefore:
Vt/V3600 = 1.53, whence V3s = 1.53Vmh = 1.53(80) = 122.4 mph.
RE: Converting Wind Averaging Speeds
(for example, if you have a fastest mile velocity of 120 MPH, then the 3-second gust would be 1.2*100= 120 MPH).
Please note that the factors used to compute the pressures are not the same as those for the fastest wind)
I think this would be a good approximation.
I hope this helps.
RE: Converting Wind Averaging Speeds
RE: Converting Wind Averaging Speeds
Thanks for your assistance. I've found some really good sources of information. :)
Matt