Division 2.5.4 Sound propagation model

For a receiver R the calculations are made according to the following steps:

1. (1)

   on each propagation path:

   • calculation of the attenuation in favourable conditions,

   • calculation of the attenuation in homogeneous conditions,

   • calculation of the long-term sound level for each path;

2. (2)

   accumulation of the long-term sound levels for all paths affecting a specific receiver, therefore allowing the total sound level to be calculated at the receiver point.

It should be noted that only the attenuations due to the ground effect (A_ground ) and diffraction (A_dif ) are affected by meteorological conditions.