Akademik Veri Yönetim Sistemi
Measurement: Journal of the International Measurement Confederation, cilt.269, 2026 (SCI-Expanded, Scopus)
Road traffic noise is a significant environmental concern that affects urban livability and public health. Conventional prediction models generally assume linear sound propagation, which often leads to inaccuracies under real field conditions. This study aims to investigate the actual propagation behavior of road traffic noise in both horizontal and vertical directions, and to test the validity of the linear assumption using a multi-point, multi-level field measurement approach. Noise data were simultaneously collected at nine points over five different days under varying meteorological and traffic conditions. Equivalent continuous sound levels (LAeq) were analyzed, and contour maps were generated using dBmap.net in accordance with ISO 9613-2 standards. The results reveal that noise attenuation follows a non-linear pattern with horizontal distance (≈0.21 dBA/m), while levels increase with height (≈0.68 dBA/m). Additionally, slopes and wind conditions were found to influence propagation significantly. These findings indicate that the widely accepted linear assumption in existing models, such as CNOSSOS-EU and FHWA TNM, does not fully reflect real-world conditions. The study highlights the necessity of three-dimensional analysis to improve the accuracy of road traffic noise modeling and control strategies.