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Algorithms II · software · air quality monitoring

Downwind and Crosswind Distances

The model uses a Cartesian receptor network. All receptor points are converted to Cartesian (X,Y) coordinates prior to performing the dispersion calculations. In the Cartesian coordinate system, the X axis is positive to the east of the user-specified origin and the Y axis is positive to the north. The user must define the location of each source with respect to the origin of the grid using Cartesian coordinates. If the X and Y coordinates of the source are X(S) and Y(S), the downwind distance x to the receptor, along the direction of plume travel, is given by:

x=-[X(R)-X(S)]sin(WD)-[Y(R)-Y(S)]cos(WD)        (2)

where WD is the direction from which the wind is blowing. The downwind distance is used in calculating the distance-dependent plume rise and the dispersion parameters. The crosswind distance y to the receptor from the plume centerline is given by:

y=-[X(R)-X(S)]cos(WD)-[Y(R)-Y(S)]sin(WD)        (3)

Wind Speed Profile

The wind power law is used to adjust the observed wind speed, u_ref, from a reference measurement height, z_ref, to the stack or release height, h_s. The stack height wind speed, u_s, is used in the Gaussian plume equation. The power law equation is of the form:

u_s=u_ref(h_s/z_ref)^p     (4)

where p is the wind profile exponent. Values of p may be provided by the user as a function of stability category and wind speed class. Default values are as follows:

The stack height wind speed, u_s, is not allowed to be less than 1.0 m/s.

air quality monitoring

Air quality monitoring: This software is a complementary tool for air quality measurements. Air emission modeling can be estimated through this simulation system.

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