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Current best practice aircraft noise calculations primarily focus on strategic noise mapping to assess compliance with legal noise limits.To date, the effects of shielding by buildings or reflections from buildings, forests or cliffs have not been considered in noise mapping, despite their potential impact on results, particularly in mountainous and/or densely built urban areas.In this study, the effects of shielding by buildings and reflections from buildings, forests and cliffs on aircraft noise results were assessed.Calculations were performed with the sonAIR simulation tool for a residential area close to the runway of a military airfield in a mountain valley in Switzerland.The calculations revealed that shielding and reflections may locally strongly affect the results.While this may yield valuable insights for special investigations, calculations without accounting for these effects are still recommended for large-scale noise mapping, to obtain a better overview of the noise exposure and legal compliance.
Ramseier et al. (Thu,) studied this question.