低空飞行器将重塑全球城市的噪声暴露
Low-altitude aircraft will reshape noise exposure across global cities
- Institute for Environmental Design and Engineering, The Bartlett, University College London（伦敦大学学院巴特莱特建筑学院环境设计与工程研究所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究模拟十个城市区域的低空飞行器运行，发现其噪声暴露受道路噪声与城市形态影响，水平与垂直差异显著，需三维航线评估以区分新暴露区域。
AI中文摘要：
正如机动化使道路交通成为二十世纪城市标志性噪声源一样，低空飞行器可能重塑二十一世纪的城市声学暴露。然而，这种噪声如何与现有声环境及全球城市的三维城市形态相互作用，仍不清楚。我们对覆盖所有有人居住大陆的十个城市区域，模拟了相同的低空飞行器运行。水平暴露在不同城市内部及城市之间差异显著，取决于道路交通噪声条件和城市形态，后者也强烈影响总体衰减。一些在低空飞行器运行前噪声水平较低的半封闭空间，经历了超过20 dB(A)的增幅，在城市噪声暴露中形成了显著的局部对比。在垂直方向上，暴露随高度和对飞行路线的声学可见性而变化，在楼层、立面及高度相近的建筑之间造成垂直暴露不平等。这些发现表明，低空飞行器可重塑全球城市的噪声暴露，需要进行航线评估，以区分新暴露区域与已暴露区域，并考虑三维暴露。
英文摘要：
Just as motorisation made road traffic a defining noise source of the twentieth-century city, low-altitude aircraft may reshape urban acoustic exposure in the twenty-first. Yet how this noise interacts with existing sound environments and three-dimensional urban form across global cities remains unclear. We modelled identical low-altitude aircraft operations across ten urban districts spanning all inhabited continents. Horizontal exposure varied markedly across and within cities, depending on road noise conditions and urban morphology, which also strongly influenced overall attenuation. Some semi-enclosed spaces with low noise levels before low-altitude aircraft operations experienced increases above 20 dB(A), creating pronounced local contrasts in urban noise exposure. Vertically, exposure varied with height and acoustic visibility to the flight route, creating vertical exposure inequalities between storeys, façades and buildings at comparable heights. These findings show that low-altitude aircraft can reshape noise exposure across global cities, requiring route assessment to distinguish newly exposed from already exposed areas and to account for three-dimensional exposure.
