Conference_programme: 19.2 - Outdoor sound propagation
Lecture: Validating sound propagation predictions with increasing complexity near multi-lane roads
Author(s): Van Renterghem Timothy, Meeussen Camille , Hiraguri Yasuhiro , Dekoninck Luc, Aletta Francesco, Botteldooren Dick
Summary:
Predicting sound propagation from highways over complex terrain can be challenging and validation with measurements is most often lacking. This study considers a 6.3-m high (grown) embankment parallel to a depressed 8-lane ring road having a middle verge. At 2 fixed locations (one near the road’s border, the other one on the embankment), continuous sound pressure level measurements were conducted during a full month. In this validation exercise, the full range of prediction methods was covered, going from a highly detailed full-wave numerical technique to common engineering methods. The full-wave technique, here applied in two dimensions, shows a close spectral correspondence with the measurements, including the (limited) effect of scattering by the sparse vegetation near the top of the talud. Also the Harmonoise point-to-point model, allowing a fast numerical evaluation, shows good agreement with the spectral level difference data, indicating that the sound propagation physics are well captured. Other techniques like ISO9613-2, ASJ RTN 2013, CNOSSOS and NORD2000 (the last two methods implemented in a commercial noise mapping software) show poor spectral resemblance with the measurements, making them inappropriate for designing road traffic noise abatement solutions by landscaping.
Corresponding author
Name: Prof Timothy Van Renterghem
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Country: Belgium
