Discussion
Consider the following statements about the Gaussian plume model:
1. Concentration is inversely proportional to wind speed.
2. The dispersion coefficients depend on stability and distance.
3. The reflection term reduces the calculated ground level concentration.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
Statement 1 is correct: \( u \) appears once in the denominator, so concentration is inversely proportional to wind speed. Statement 2 is correct: the dispersion coefficients are read from curves indexed by Pasquill stability class and downwind distance, growing as the plume travels.
Statement 3 is false and reverses the effect. The reflection term treats the ground as a perfect reflector and adds an image source below it, so it increases the calculated ground level concentration. Omitting it would understate the result, which is why the conservative assumption of no surface removal is the usual default.
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