A passive and chemically inert pollutant is emitted from a chimney of height h (= 120...
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A passive and chemically inert pollutant is emitted from a chimney of height h (= 120 m) and diameter d (= 0.8 m) into the atmosphere of ambient temperature T. (= 298 K). The pollutant emission rate, discharge velocity and temperature are Q (= 2,000 kg hr ¹), v (= 10 m s¹) and To (= 398 K), respectively. The wind speed at 10-m elevation is u10 (= 1.8 m s¹) and the incoming solar radiation is strong. The surrounding land type is rural. (a) Calculate: (i) The wind speed at the chimney height u(z = h); (ii) The plume rise Ah; and (iii) The maximum ground-level pollutant concentrations. (b) Sketch the ground-level, centreline concentrations C(x, y=0, z = 0) for 10¹ km ≤x≤ 1 km. (c) Briefly explain why increasing wind speed leads to less unstable and less stable, respectively, in the daytime and nighttime atmosphere as tabulated in Table Q6(a). Note: The following equations, tables and figures are provided for your information. (i) Power law of Deacon u(z) = ₁0² 10, (6a) where z is the height (m), p the wind profile exponent, u(z) the wind speed at height z and u10 the wind speed at 10-m altitude. A passive and chemically inert pollutant is emitted from a chimney of height h (= 120 m) and diameter d (= 0.8 m) into the atmosphere of ambient temperature T. (= 298 K). The pollutant emission rate, discharge velocity and temperature are Q (= 2,000 kg hr ¹), v (= 10 m s¹) and To (= 398 K), respectively. The wind speed at 10-m elevation is u10 (= 1.8 m s¹) and the incoming solar radiation is strong. The surrounding land type is rural. (a) Calculate: (i) The wind speed at the chimney height u(z = h); (ii) The plume rise Ah; and (iii) The maximum ground-level pollutant concentrations. (b) Sketch the ground-level, centreline concentrations C(x, y=0, z = 0) for 10¹ km ≤x≤ 1 km. (c) Briefly explain why increasing wind speed leads to less unstable and less stable, respectively, in the daytime and nighttime atmosphere as tabulated in Table Q6(a). Note: The following equations, tables and figures are provided for your information. (i) Power law of Deacon u(z) = ₁0² 10, (6a) where z is the height (m), p the wind profile exponent, u(z) the wind speed at height z and u10 the wind speed at 10-m altitude.
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