Diffusion coefficient of vegetation: measurements and simulation

Yuliya Smyrnova , Jian Kang , Christopher Blackford , Chris Cheal

This paper reports the results of an investigation on the diffuse reflection from two typical bedding plants in Europe. This is a part of a lager study on the acoustic properties of vegetation, aiming at reducing noise from urban traffic. Directional diffusion coefficients of the plants have been measured in a semi-anechoic chamber and polar responses that represent sound energy distribution on semicircles surrounding the plants have been obtained. The results show that the plants diffusely reflect sound energy mainly at middle and high frequencies. In parallel, a simulation model based on the finite-element method for predicting diffuse reflections from plants has been developed. The model takes into account impedance of foliage and soil measured in an impedance tube, and their geometric characteristics. There is a good agreement between prediction and measurement.

Mots clés: diffusion coefficient; scattering; noise control; simulations

Domaines: Acoustique [physics.class-ph]

Yuliya Smyrnova, Jian Kang, Christopher Blackford, Chris Cheal. Diffusion coefficient of vegetation: measurements and simulation. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811292⟩