Problem 2 (8 points)
An industrial smokestack continuously released smoke into the atmosphere over
a two-day period. Due to problems with process control between 11:30 and
13:30, the temperature of the smoke plume at the point of exit, out of the
smokestack, was 10 °C higher on the second day than it was on the first day (the
temperature was 30 °C on the first day). When watching a weekly weather
bulletin for the area, you see that wind speed, wind direction and ambient
temperature profiles were all the same for the two-day when smoke was
released. Assuming that the average ambient temperature was 25 °C on both
days, between 11:30 and 13:30, indicate if each of the following statement is true
or false:
a) The effective stack height was the same for both scenarios (i.e. both
days) and it was equal to the actual stack height.
(b) Neither effective stack height was equal to the corresponding plume
rise.
(c) The horizontal direction in which the plume moved on day two was
opposite the direction in which it moved on day one.
(d) The community in the vicinity of the industrial operation was more
exposed to air pollution, from the smokestack, on day one.
[This problem was in the 2022 supplementary examination]
