Study On Spatial Dispersion Model Of Point Source Noise

Urban environment noise pollution is one of the four major environmental hazards as well as a main matter of concern on environmental pollution control in 21st Century. With the acceleration of the production development and urbanization, people enjoy the convenience in many aspects such as transportation,production,daily life, while these have been begetting a series environmental problem, one of which is the increasingly serious noise pollution.Noise levels is a very important factor in measuring urban living environment, whereas it's incompatible between the demand of high quality of the living environment and the deterioration of the noise pollution. Consequently, it now becomes a very important task to simulate and forecast the environmental noise pollution, carry out comprehensive pollution prevention and control, and guarantee people a good environment for living, working and studying.This thesis studies on the spatial diffusion of point source noise.First of all,comparison and analysis on the existing models at home and abroad are studied,and the in-depth analysis on the modeling and the application of point source noise forecast are done.This is followed by the analysis of the characteristics of spread of steady-state point source noise,and then the modeling.Finally, with the visualization method of GIS spatial data, this paper visualizes in three-dimension space the distributing characteristic of noise points in the control region, whose relative data have been collected to predict noise level by model calculation and by comparative analysis and validation of predictive value according to the real data.The main results of the thesis are as follows:(1) By analyzing the point source noise and it's characteristics of spread, the model to calculate the noise value of feature point around single building in the residence zone has been constructed.(2) Through the study of the experimental area, the distribution law of predictive value under the effect of the point source noise has been gotten, and it analysis and validates the prediction made by this law.(3) The methods of GIS spatial data visualization are used to visualizes the situation of noise diffusion,and then the thesis has made some treatment and prevention measures and proposals.