Abstract
Considering traffic dynamics greatly improves noise estimation in urban area. This can be achieved by coupling a dynamic traffic model with both emission laws and sound propagation calculation. This paper focuses on the influence of noise source representations in the combination with the traffic model. Several representations are tested: point sources and homogeneous line sources of different sizes. We aim at evaluating how these representations correctly estimate classical descriptors (LAeq and statistical descriptors) and specific descriptors able to capture noise dynamics at a traffic signal scale. Three typical urban situations are studied: in front of, upstream and downstream a traffic signal. Noise source representation can be coarse for classical descriptors calculation if traffic dynamics is precisely described. On the contrary, noise source representation should be refined to precisely assess noise dynamics.
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