RASS sound speed profile (SSP) measurements for use, in outdoor sound propagation, models

摘要

The performance of outdoor sound propagation models depends to a great extent on meteorological input parameters. In an effort to improve speed and accuracy, model output synthetic sound speed profiles (SSP) are commonly used depending on meteorological classification schemes. In order to use SSP measured by RASS in outdoor sound propagation models, the complex profiles need to be simplified. In this paper we extend an investigation on the spatial and temporal characteristics of the meteorological data set required to yield adequate comparisons between models and field measurements, so that the models can be fairly judged. Vertical SSP from RASS, SODAR wind profiles as well as mast wind and temperature data from a flat Lenin site and measured over a period of several months are used to evaluate applicability of the logarithmic approximation for a'stability classification scheme proposed by the HARMONOISE working group.