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1.5.6.2  The Vertical Term for Particle Deposition

     The Vertical Term for particle deposition used in the complex terrain algorithm in ISC is the same as described in Section 1.1.6 for the simple terrain algorithm, except that the plume height and dispersion parameter input to the vertical term are based on the radial distance, as described above, and that the adjustment of plume height for terrain above stack base is different, as described in Section 1.5.6.2.

1.5.7 The Decay Term

     See the discussion given in Section 1.1.7.

1.5.8 The Plume Attenuation Correction Factor

     Deflection of the plume by complex terrain features during stable conditions is simulated by applying an attenuation correction factor to the concentration with height in the sector of concern.  This is represented by the variable CORR in Equation (1-93).  The attenuation correction factor has a value of unity for receptors located at and below the elevation of the plume centerline in free air prior to encountering terrain effects, and decreases linearly with increasing height of the receptor above plume level to a value of zero for receptors located at least 400 m above the undisturded plume centerline height.  This relationship is shown in the following equation:

where:

   CORR

 

= attenuation correction factor, which is between 0 and 1

    ΔHr

 

= height of receptor above undisturbed plume height, including height of receptor above local ground (i.e., flagpole height)

 

1.5.9 Wet Deposition in Complex Terrain

     See the discussion given in Section 1.4.

 

 

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