Improved sound propagation modelling through the use of synthetic turbulence

Type: FORMAS: Future research leader grant

The project implements a newly developed turbulence model into sound propagation models. The aim of this is to improve the modelling of turbulence effects on sound propagation and thereby limit the uncertainties connected to community noise estimations. The new turbulence model contain a more accurate description of turbulent fluctuations than the ones previously used in sound propagation models. The first step of the project is to merge the turbulence model with a sophisticated sound propagation model and validate the result against measurements. The project builds on the experiences from that study in exploring whether simpler models with intended use in community noise modelling can also be improved. The project includes a measurement campaign at the Uppsala Marsta laboratory, in which turbulence of both wind, temperature and humidity is measured, along with sound pressure levels at ten different distances from a straight road which acts as a noise source. During the project the measurements are used to study the spatial correlations of turbulence and its effect on sound propagation, and also to validate the model development. After the project ends the data base will be made publicly available.