CANARINA:
DISPER:
SOLUTIONS: DISPER
COMMANDS:
ALGORITHMS:
EMISSIONS:
GRAPHS:

Plume Rise Formulas The plume height is used in the calculation of the Vertical Term. The distance dependent momentum plume rise equations are used to determine if the plume is affected by the wake region for building downwash calculations. Stacktip Downwash In order to consider stacktip downwash, modification of the physical stack height is performed. The modified physical stack height h_{s} is found from: h_{s}’=h_{s}+2d_{s}[(v_{s}/u_{s})1.5] for v_{s}<1.5u_{s} (5) or h_{s}’=h_{s} for v_{s}> o =1.5u_{s} (6) where h_{s} is physical stack height (m), v_{s} is stack gas exit velocity (m/s), and d_{s} is stack top diameter (m). If stack tip downwash is not considered, h_{s}’= h_{s} in the following equations. Buoyancy and Momentum Fluxes For most plume rise situations, the value of the Briggs buoyancy flux parameter, F_{b} (m^{4}/s^{3}), is needed F_{b}=gv_{s}d_{s}^{2}(DT/4T_{s}) (7) where DT = T_{s}  T_{a}, T_{s} is stack gas temperature (K), and T_{a} is ambient air temperature (K). For determining plume rise, the momentum flux parameter, F_{m} (m^{4}/s^{2}), is calculated based on the following formula: F_{m}=gv_{s}^{2}d_{s}^{2}(T_{a}/4T_{s}) (8)
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Air pollution map (XYPlane) produced by continuous discharge in time (two stacks). The red colour represents high pollutant concentrations. Wind: S (180 degrees).
Air pollution map (XYPlane) produced by continuous discharge in time. The red colour represents high pollutant concentrations. Winds: NE (45 dregrees).
