In recent decades, noise pollution due to urban development, population growth, increasing density of buildings, industrialization and inconsistent land-uses, becoming global issue with different physiological and psychological effects in the long time, so it is necessary to study it due to its emission sources and various increasing and decreasing factors in the urban environment. This study aims to eva‎luate and model the noise pollution of five districts of Shiraz city that are the cityʹs traffic lines and have several historical, recreational and natural sites. Measuring noise level was performed in 78 sampling points, which have been selected by stratified random sampling method. To model noise pollution, 3 comparative approaches, support vector machine with rbf kernel, linear regression of land use with step-by-step variable selection algorithm and accumulation model (group learning), which is a combination of the mentioned above models with the random forest model, were used. To prepare the noise pollution zoning map of the city, the predicted noise level map of the support vector machine model with adjusted parameters was used and the noise level to 4 classes without noise pollution first degree critical, Two and three were divided and the area of each class was calculated.the results showed that the support vector machine model has the best performance compared to others and has a lower generalization error (adjust R2 = 0.905, CV-RMSE = 2.24). In all models, despite their different performance in predicting noise levels; the transportation network, due to traffic volume and average speed, had the greatest role in increasing noise levels and among other pathways, secondary urban passages had the greatest effect on increasing noise in the study area and vegetation had the greatest effect on the noise level reduction. Finally, it was found that 63.7% of the study area has noise pollution. therefore defferent methods for noise pollution reduction such as suitable land-use allocation, use of dense and varied plants for green space vegetation, move of intercity passenger terminal to outskirts of the city and integrated approach to noise management, should be given priority in urban planning and urban environment protection.

علي لطفي

حسين مرادي، مهدي قيصري

عليرضا سفيانيان، سعيد پورمنافي