01677851

Monograph

http://www.trb.org/Main/Blurbs/177926.aspx

Past studies show sound levels fluctuate as a result of changes in vertical gradients of wind speed and temperature. These meteorological influences refract sound waves, altering their trajectories and the distances at which their respective influences may occur. This project builds on previous research by measuring and documenting meteorological effects on roadway sound propagation under different atmospheric conditions, developing guidance on how to quantify those effects for inclusion in noise models, and provides customizable materials to help explain those effects to stakeholders, decision makers, and other non-specialists. The research effort included collecting field data at two monitoring sites, one with and the other without a highway noise barrier, under a range of meteorological conditions. These data were then analyzed to detect the differences in sound levels for nearby areas attributable to those conditions. The results can be used to adjust noise models commonly used by state DOTs to take into account various meteorological conditions.

Project 25-52

English

327p

2018

NCHRP Research Report

9780309390460

Digital/other

Appendices; Figures; Photos; References; Tables

Sound; Sound level; Sound transmission; Traffic noise; Weather

Design; Environment; Highways

TRIS, TRB, ATRI

Aug 16 2018 8:36AM