Environmental Science: Numerical Questions – Wind Speed Exponent

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Air Wind Speed: Numerical Questions | Environmental Science

Wind Speed

Q1) An anemometer at a height of 10 m above the ground measures a wind speed of 0.5 m/s. For a neutral atmosphere with wind profile exponent p = 0.25, the wind speed at an elevation of 160 m will be:

(1) 1 m/s

(2) ~ 1.8 m/s

(3) 0.5 m/s

(4) 2.5 m/s

Answer: (1) 1 m/s

UH = windspeed at the elevation H ()

Ua = windspeed at the anemometer height = 0.5 m/s

H = effective height of the plume =160 m

Za = anemometer height above ground = 10

p = a dimensionless parameter that depends

on surface roughness and atmospheric stability = 0.25

= 0.5

= 0.5

= 0.5

= 0.5

= 0.5*2 = 1

Q2) In a rough terrain the wind speed at a height of 10 m is 2.5 m/s. The wind speed at an elevation of 300 m will be:

1) 4.9 m/s

2) 1.2 m/s

3) 3.6 m/s

4) 7.9 m/s

Answer: Option (1) 4.9 m/s

= 2.5

= 2.5

= 2.5

= 2.5 *1.97

= 4.92 m/s

Wind Speed Exponent

Wind Speed Exponent

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