INCLUDING TURBULENCE AND ABSORPTION EFFECTS IN CITY CANYON CALCULATIONS

摘要

When predicting urban traffic noise levels at shielded positions, like courtyards, many of the standard methods fail. This is mainly due to the absence of multiple reflections in the methods, and of the practice to only include the closest road as a source. This work aims at developing a numerical model for urban sound propagation for shielded positions that includes multiple reflections and distant sources. An equivalent sources approach is used, where the absorption inside the canyon is taken into account. The turbulence is included using a mutual coherence approach. The results indicate that the turbulence has a small effect on the total A-weighted level, but that the absorption can be important.