Optimization of the acoustic performance of roadside noise barriers has been investigated from the 1980′s on in many different countries. In particular, France, Japan, the Netherlands and the U.K conducted extensive research and development for improving the acoustic performance of edge-modified barriers. Several supplemental algorithms to road traffic noise prediction schemes have been developed to account for edge-modified barriers. However, most of these studies only focused on the assessment of the screening performance in the shadow zone where the receivers are at relatively low heights. In the situation of high-rise cities, many noise sensitive receivers are located at significant heights where the attenuation due to a typical noise barrier is greatly reduced. This paper reports a numerical study to estimate the acoustic performance of the edgemodified barriers with four different profiles. The numerical simulations assess and compare the acoustic effectiveness of these edge-modified barriers at various receiver positions.
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