Discussion
Wind speed generally increases with height according to
Answer: A
Correct answer: A power law in height
Wind speed increases with height as
\[ u_2 = u_1 \left(\frac{z_2}{z_1}\right)^{p} \]where the exponent \(p\) depends on surface roughness and stability - about 0.1 over open water in unstable air, and 0.4 or more over a city in stable air. It matters because the wind at stack height, not at the 10 m of a standard anemometer, is what governs plume rise and dilution.
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