Discussion
Wind speed with height for two power law exponents.
| Height (m) | Exponent 0.10 | Exponent 0.25 |
|---|---|---|
| 10 | 5.0 | 5.0 |
| 40 | 5.7 | 7.1 |
| 80 | 6.2 | 8.4 |
| 120 | 6.4 | 9.3 |
What does the comparison imply for a plume rise calculation?
Answer: A
Correct answer: Using the 10 m wind would overestimate rise
Plume rise varies inversely with wind speed, and the wind at stack height is appreciably greater than at 10 m - at 120 m and an exponent of 0.25 it is nearly twice as fast. Using the 10 m value would therefore overestimate the rise, and with it the effective height, giving a falsely reassuring ground-level concentration.
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