Micrometeorological effects on urban sound propagation: A numerical and experimental study

Abstract

The present work is in line with the EM2PAU project whose aim is to quantify the in??uence of micrometeorological effects on sound propagation in a street “canyon”. This study is carried out both numerically and experimentally. Experimental data are issued from a long-term in situ experimental campaign. A ½ street scale model is installed in a quiet outdoor environment in order to control noise emission. Different values of street width (W _s ) will be considered in this project. The first studies are conducted with the value W _s /H _s = 0.7, Hs being the street height, which corresponds to a typical aspect ratio in most European cities. The turbulent ??ows and temperature ??elds in the street are recorded by using 9 sonic anemometers and 48 thermocouples. Moreover, reference meteoro logical parameters are recorded from two 10-m meteorological towers, located around the site. Simultaneously, acoustic measurements are carried out along the main propagation axis of the street, across the central cross section and outside the street. A few acoustic results from preliminary measurements are presented and discussed.