The ground effect in terms of A-weighted sound exposure level.

Abstract

This paper presents contour charts for the A-weighted sound exposure level of noise generated during passage of a single vehicle. The ground effect has been taken into account for two types of surfaces. The results can be used for prediction of the equiv alentcontinuous A-weighted sound pressure level of traffic noise.

Traffic noise in a built-up area influenced by the ground effect.

“…Hence, the A-weihgted sound pressure level, LpA = 10 log(pA2/p02), is: (6) where (7) represents the undisturbed geometrical spreading and (8) is the measure of excess attenuation. From the other hand the results of measure-ments1-5) and calculations6-8) indicate that the Aweighted sound pressure level, "far away" from a noise source, can be approximated by (9) Parameters a and b depend on properties of the terrain and the source. (8) to the form given by Eq.…”