2025 Volume 81 Issue 3 Article ID: 24-00074
When determining noise barriers for individual residences along roadsides, it is necessary to determine not only the height but also the length of the barrier. However, conventional cross-sectional prediction methods can assess height but not the required length. Three-dimensional prediction methods allow for the consideration of both height and length of the noise barrier, but they are not widely used for noise prediction along roadsides due to computational complexity. In this study, we investigated the factors influencing the required length of noise barriers and proposed a formula for calculating the length of noise barriers using the cross-sectional prediction results. Additionally, we validated the suitability of the proposed formula using the three-dimensional noise prediction software. The results showed that the proposed formula can reasonably determine the length of noise barriers satisfying the noise conservation goals. Furthermore, we proposed a method to achieve evaluation criteria with the optimal combination of length and height of noise barriers and verified its effectiveness.
