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1000 d,, meters 100 10 1.0 0.1 100 m, 60 m 100 m, 200 m 10 m, 2000 m 200 m, 50 m 1 10 Distance downwind, km 100
You were to apply Gaussian dispersion model to estimate daytime pollutant concentration 1 km downwind of a stack. The surface wind speed is 10 m/s. The solar radiation is strong. Based on these information, what is the stability of class. Table 7.7 Atmospheric Stability Classifications Day Surface Incoming Solar Radiation Wind Speed m/s Strongb Moderate Slightd <2 A A-B 2-3 B 3-5 B-C 5-6 C-D >6 D D Notes: Surface wind speed is measured at 10 m above the ground. Corresponds to clear summer day with sun higher than 60° above the horizon. Corresponds to a summer day with a few broken clouds, or a clear day with sun 35-60° above the horizon. d Corresponds to a fall afternoon, or a cloudy summer day, or clear summer day with the sun 15-35°. Cloudiness is defined as the fraction of sky covered by clouds. For A-B, B-C, or C-D conditions, average the values obtained for each. A= Very unstable D = Neutral B=Moderately unstable E= Slightly stable C=Slightly unstable F = Stable Regardless of wind speed, Class D should be assumed for overcast conditions, day or night. Source: Adapted from Turner (1970). < ouu A-B с Night Cloudiness с BUCD0 EEDDD Cloudy (>4/8) Clear (<3/8) F F ED