Calculation of noise barrier performance in a turbulent atmosphere by using substitute sources above the barrier

Artikel i vetenskaplig tidskrift, 2000

The paper presents a model that can be used for calculating the sound reduction by a noise barrier in a turbulent atmosphere. The field due to the acoustic source is substituted by a distribution of sources above the barrier (here called substitute sources). The mean power at the receiver is calculated as line-of-sight propagation through a turbulent atmosphere from all substitute sources using a mutual coherence function. In this study the strengths of the substitute sources are calculated using the Kirchhoff approximation. The calculated results show good averall agreement with those from using a parabolic equation method (PE).