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Communication Dans Un Congrès Année : 2014

Numerical and experimental studies of multiple scattering and ground effect related to sound propagation in forest

Résumé

The study of sound propagation through forested areas remains an important topic for the outdoor sound propagation community. Absorption from forest ground at low frequencies, multiple scattering caused by tree trunks and the modification of temperature and wind gradients directly impact sound propagation in significant forested areas. The present communication studied both multiple scattering and ground effects from numerical and experimental analyses. In a first approach the tree trunks are replaced with rigid cylinders in both numerical and experimental analyses. The Transmission Line Matrix (TLM) method has recently been validated for several cases related to outdoor sound propagation. This method is extended here to the study of multiple scattering and ground effects. 3D-numerical simulations are carried out for different configurations of scatterers and different types of ground impedances. A simplified 1:10 experimental scale model made of plastic cylinders and two types of grounds are used to perform the experimental analysis. The experimental results are discussed in comparison with the numerical model for different distributions of cylinders and ground effects.
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Dates et versions

hal-01069892 , version 1 (20-02-2015)

Identifiants

  • HAL Id : hal-01069892 , version 1

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Pierre Chobeau, Gwenaël Guillaume, Judicaël Picaut, David Ecotiere, Guillaume Dutilleux. Numerical and experimental studies of multiple scattering and ground effect related to sound propagation in forest. Forum Acusticum, Sep 2014, Cracovie, Poland. 6p. ⟨hal-01069892⟩
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