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原文传递 Effect of Trees on Noise Barrier Performance; Final rept. Apr 88-1992.10

题名：	Effect of Trees on Noise Barrier Performance; Final rept. Apr 88-1992.10
作者：	Marsella, M.; Rembish, B. A.
关键词：	Noise reduction; Trees(Plants); Traffic noise; Noise control; Noise measurement; Noise intensity; Vegetation; Microphones; Noise(Sound); Noise meters; Acoustic measurement
摘要：	This study investigated the possibility that trees adjacent to a noise barrier and higher than its top would scatter traffic noise and increase the level on the receiver side of the barrier. Two lines of microphones were set up perpendicular to the noise barrier on I-287 in Morristown, New Jersey. One set was at a wooded site and the other at a clear site, 500 feet downstream. Each group of microphones comprised a reference microphone, 5 feet above the barrier top, and two field microphones at 25 and 50 feet behind the barrier. Traffic noise from the same traffic stream was recorded, with a 5-second delay in starting the downstream recording to compensate for the distance between sites. Recording was done for both full-foliage and no-foliage conditions. Analysis of the LeqA data for the full-foliage condition showed that levels at the wooded site were from .9dB to 2.7dB higher than those at the clear site. A similar analysis of the no-foliage data was inconclusive.
总页数：	59p
报告类型：	科技报告