An engineering method to determine the attenuation due to ground effects in traffic noise prediction for long straight roads based on the ISO method

作者：Zhao, Jian-Qiang^*; Chen, Ying; Hu, Bo

来源：Noise Control Engineering Journal, 2012, 60(4): 374-378.

DOI：10.3397/1.3701017

• MODEL

In a search for a simple engineering method to determine the attenuation due to ground effects for long straight roads, a factor k was introduced to the ISO model of 9613-2-1996(E) and thus an engineering method was set up. An overestimation was obtained using the ISO model to calculate the noise levels due to long and straight roads without subdivided the line source into point sources. The overestimation varied with the distance between the observer and the road, and with the mean propagation height. Both influences of this variation are explored and shown with curves. Calculations indicated that the overestimation can be approximated when using the engineering method. The values of the factor k ranged from 1 to 1.5. For the point source and the infinite-length source, k equaled 1 and 1.5 respectively, and for the finite-length line source, k ranged from 1 to 1.5. The k values corresponding to different lengths of the long straight roads are shown in this paper. The proposed engineering method was also validated to be effective through a comparison with the RLS-90 model for an infinite road. The engineering method could be used simply for calculating the attenuation due to ground effects in traffic noise prediction of long straight roads.

• 出版日期2012-7
• 单位长安大学