Abstract
This work reports on the results of outdoor measurements which were carried out using a highly directional parametric acoustic transducer and a 2-D array of microphones. The purpose of these measurements was to determine the frequency and angular dependence of the acoustic transmission loss of hedges (hedgerows). The experimental setup and procedure used in this work enabled us to simulate an approximately plane wave propagation regime and to reduce considerably the effect of ground on the recorded transmission loss data. The results show that a 1.5-2.5m thick hedge can provide a considerable (up to 20 dB) transmission loss which is comparable to that expected from an artificial noise barrier structure. The theory developed by Aylor (JASA 51(1), 197-205, 1972) is used to explain the observed dependencies as a function of the leaf density, size and hedge thickness. An alternative equivalent fluid theory for porous absorber (Horoshenkov et al, JASA 104(3), 1198-1209, 1998) is also used to explain the observed attenuation for sound propagation through the leaf mass.
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