Abstract
The formation mechanisms of road traffic noise in urban historic districts are comprehensively studied through analyzing the superposition of influencing factors with the characteristics of historical districts. Then both the gray related theory and spatial syntax theory are used to construct the screening method of road traffic noise causes which can combine accurate quantitative data and spatial structure selection probability, while the empirical study of Grand Tang Dynasty Ever-bright block in Xi’an is conducted then. The research indicates that the formation mechanisms of road traffic noise in urban historical districts are due to complex stratification in which the traffic flow of motor vehicles, non-motor vehicles and pedestrians affect the noise formation by individual or as a whole under different conditions, as well as the disturbances of landscape nodes and road attributes. Moreover, it is believed that accurate identification of non-quantitative factors is the key to design road traffic noise screening method in historical districts rather than motor vehicle traffic flows.
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