Urban Road Traffic Noise Three-dimensional Visualization And Analysis

Traffic is the support of city,urban transport more perfect,city more progress.With the acceleration of urbanization process in China, the completeness of the urban road network and car ownership growth, urban road traffic noise is growing.Gradually,noise pollution is becoming increasingly serious, noise pollution reduces efficiency and affects people’s physical and mental health, relevant departments and urban residents pay attention to this.With the rapid development of GIS technology, the increase public participation, a more intuitive understanding of urban road traffic noise distribution provides the foundation.Compared with the process of urban development, forecasting and prevention of urban noise pollution has not been faster development.Therefore, it is necessary to establish and improve the urban road traffic noise visualization system for urban planning,which lays the foundation of the "low-carbon path” and"five in one".Considering road structure varies in different cities and existing urban noise prediction model have different applicability.In the first place,we should find out advantages and disadvantages of the common urban noise prediction model.Secondly,we find out the comparative results of measured and predicted values. Finally,we select the appropriate forecasting model as a predictive model of the article.For intuitively understand the the distribution of noise,we combine the urban road traffic noise prediction model with three-dimensional model of the city.Thereby,We build three-dimensional noise prediction model which is suitable for traffic conditions.At the same time we visual noise values which provides a reference for reducing urban road traffic noise.The main research work and results of this paper are as follows:(1) Induction of urban road traffic noise features and its evaluation: this paper generalizes urban road traffic noise sources, summarizes the characteristics and influencing factors of urban road traffic noise propagation. Referencing to international standards and national guidelines, it selects the noise evaluation of urban road traffic noise for China.(2)Noise distribution of Nanjing expressway: According to the standard of urbanplanning, with reference to China’s national standard GB3222-1994,we conduct site surveys to obtain the horizontal and vertical distribution of noise jieye international of city high-rise buildings. The true value of the noise data provides for the selection of suitable traffic noise prediction model, which provides the foundation of this paper.(3)Three-dimensional prediction model of urban traffic noise: Comparing common traffic noise prediction models from domestic and foreign, selects the suitable one for Nanjing’s traffic, which is the base model for this study. Using numerical analysis and simulation, by field measurements of noise impact data and other information, and use-by difference correction method for correcting the model parameters, then we obtain a three-dimensional traffic noise prediction model for Nanjing expressway high-rise buildings along the city roads.(4) Three-dimensional visualization of urban road traffic noise: combined with three-dimensional traffic forecasting model of urban road corrected, through spatial and attribute database management, according to the model calculations required, extracted from the database related data visualization analysis to obtain accurate and reliable analysis results, thereby performing the evaluation of road traffic noise, and for the sustainable development of the city to contribute.