The 'wind speed' profile with height in the atmospheric boundary layer follows approximately:
Choose the correct answer
Constant with height (uniform wind profile)
Power law V(z) ∝ z^α — speed increases with height; roughness exponent α depends on terrain category
Decreasing with height above ground
Only affected by temperature, not height
Correct Answer
B. Power law V(z) ∝ z^α — speed increases with height; roughness exponent α depends on terrain category
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Wind profile: power law V(z) = V_ref×(z/z_ref)^α where α = roughness exponent (0.14 for open country; 0.28 for suburbs; 0.40 for city centre) per IS 875 Part 3. Logarithmic law V = (V*/κ)×ln(z/z0) where V* = friction velocity, κ=0.41 (von Karman), z0 = roughness length. Both describe increasing wind speed with height, with more rapid increase over smooth terrain.
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