Ostashev Vladimir E, Wilson D Keith, Muhlestein Michael B
U.S. Army Engineer Research and Development Center, 72 Lyme Road, Hanover, New Hampshire 03755-1290, USA
J Acoust Soc Am. 2017 Aug;142(2):EL177. doi: 10.1121/1.4996696.
Sound propagation in a forest is often represented as propagation in free space with an effective complex wavenumber, which accounts for scattering and absorption. In this paper, the effective wavenumbers due to sound scattering by trunks, large branches, and the canopy are determined and analyzed based on three-dimensional multiple scattering theory. Trunks and branches are modeled as vertical and slanted finite cylinders, while the canopy is modeled by diffuse scatterers. The results are compared with two-dimensional effective wavenumbers previously used in the literature, which were obtained by approximating the trunk layer as infinite vertical cylinders.
森林中的声音传播通常被表示为在具有有效复波数的自由空间中的传播，该有效复波数考虑了散射和吸收。本文基于三维多重散射理论确定并分析了由树干、大树枝和树冠引起的声音散射的有效波数。树干和树枝被建模为垂直和倾斜的有限圆柱体，而树冠则由漫散射体建模。将结果与文献中先前使用的二维有效波数进行了比较，后者是通过将树干层近似为无限垂直圆柱体而获得的。
