Prediction Of Road Traffic Noise Attenuation Due
To Distance, Ground Absorption And Gradient
Author(s)
H. N. Rajakumara & R. M. Mahalinge Gowda
Abstract
The propagation of road traffic noise is also influenced by the ground absorption,
distance of source from receiver and road gradient. Hence it is necessary to apply
corrections to the measured traffic noise levels. In this study a simple correction
model has been developed for ground absorption, the distance and road gradient
based on the field data. The method of calculating the ground absorption consists
of identifying the locations which are totally or even partially absorbent in nature
like backyards with gardens, paddy fields, tree density on either side of the roads
and a mixture of absorbent and non-absorbent areas. Field measurements are
taken from different locations with a varying percentage of soft ground cover.
The correction value for ground absorption is estimated from the difference
between the calculated noise levels and measured noise levels at varying
percentages of soft ground cover. The correction value for distance is estimated
from the difference between the calculated noise levels and measured noise
levels at different horizontal and vertical distances over the hard ground surfaces.
Similarly, the correction value for road gradient is calculated from the difference
between the calculated noise levels and measured noise levels at different road
gradients.
Keywords: ground absorption, distance, road gradient.
1 Introduction
The estimation procedure for noise from road traffic can be usually divided into
two parts. The first part is concerned with the evaluation of the source noise level
in terms of traffic parameters and the second with the evaluation of the effect of
Keywords
ground absorption, distance, road gradient.
Related Book
Other papers in this volume
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