Effects of Tilted Noise Barriers on Road Traffic Noise
conference paper
Noise barriers along highways in the Netherlands are often tilted, at an angle of typically 10 degrees from the vertical. In this way, it is prevented that sound reflections arrive at distant receivers along curved sound paths through the refracting atmosphere. In this paper we compare results of two types of calculation methods for sound reflections in such situations: i) numerical methods, and ii) an engineering method based on the concept of Fresnel zones. Based on the comparisons, the engineering method is optimized. Possible implementation in traffic noise prediction models, such as the Dutch standard model and the EU model Cnossos, is discussed. The variation of the reflected sound level with frequency and tilt angle is analyzed. For situations with tilted noise barriers on either side of the highway, the interaction between screening and reflection by the barriers is analyzed
TNO Identifier
983031
Publisher
e-Forum Acusticum 2020
Files
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