SOUND PROPAGATION IN A PARK OVER THE YEAR

摘要

In this study, a long-term evaluation of the effect of vegetation on sound propagation is made, combined with the influence of local meteorology. Therefore, continuous measurements are performed in a densely vegetated park with two microphones. A first one is located at the border of the park, very close to a dominant road. The second microphone is situated at 55 m from the first one in between the vegetation. Equivalent noise levels in 1/3 octave bands on a 1-second basis are recorded simultaneously at both microphones. A simple methodology is presented to select individual car passages, which are used as the noise source to evaluate the attenuation between the two microphones. In this paper, preliminary results show the attenuation during a summer and a winter month (when most vegetation dropped leaves). With increasing frequency, the attenuation increased during summer.