An integrative index of noise environmental impact assessment for highway construction project

摘要

Based on the method of environmental impact assessment of traffic noise for highway construction item in our country, the paper gives a new integrative assessment index of noise environmental impact, namely Traffic Noise Impact Index (TNII). In addition, the relationship between the weighting factor of noise level and noise level is given according to investigation & test and relative analysis, and a series of weighting factors of different noise level are given. The result of study shows that TNII can reflect noise environmental integrative impact degree alongside of highway constructionproject. Its value equals certain traffic noise disturbance percentage in some district during day and night. The value can be used to estimate noise environemtn impact degree of highway construction item. Smaller the value of TNII is the environmental impact of the project is smaller. By this, we can compare and select a better one of different highway project from the aspect of sound environment. Finally an application case is given.