| Expressway noise is one of the main pollution sources of environmental pollution, and highway noise impact assessment is an important foundation for the work to control it's pollution. Traffic noise prediction is an important part of the EIA of expressway construction, so this article makes an analysis of two noise prediction models in the process of prediction, the specification model of Version 2006(JTGB 03 2006)and the specification model of Version 2009(HJ 2.4 2009),which are applied to noise prediction widely in China nowadays. The study focuses on verifying both models and working on comparative analysis using the environment monitoring data, and then get that the calculated results with both models differ by 3dB~5dB from the measured values. And what's more, under conditions of the vehicle flowrate bigger than 300,the results with the specification model of Version 2009 is closer to the measured values, otherwise the results with the specification model of Version 2006 is closer to the measured values. Combining the two models together, adopting the criterion of specification model of Version 2006 to calculate cars' speed, considering the vehicle flowrate when working on the distance attenuation, and then applying the model of Version 2009, the predicted values will be even closer to the measured values. |
