Faculty of Architecture and Urban Planning, Chongqing University, Chongqing 400045, China; Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, China.
Faculty of Architecture and Urban Planning, Chongqing University, Chongqing 400045, China; Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, China.
Sci Total Environ. 2016 Oct 15;568:1283-1294. doi: 10.1016/j.scitotenv.2016.03.097. Epub 2016 Apr 29.
Light rapid transit (LRT) has been widely used in a number of Chinese cities in recent years. Different from plain cities, the urban areas in mountainous cities are featured with dense road networks and high density of buildings. The noise impact of urban LRT could be more complex and significant due to the special morphological conditions in mountainous cities. This paper aims to investigate the noise exposure of residential areas along LRT lines in a typical mountainous city, namely Chongqing in Southwest China, through a series of field measurements and questionnaire surveys. Eight typical spatial configurations were classified to represent the relationships between LRT lines and urban mountainous environment. Both the outdoor and indoor acoustic environment of residential areas along LRT lines largely exceeded the national standards by up to 15dBA, with dominant at low frequencies. The LRT noises tend to be more dominant on the 'below track' and 'passing through' rather than 'above track' areas or 'facing towards' locations. Good agreements were achieved between acoustic measurements and subjective evaluations from the local residents. Residents in the noisier areas tend to be more annoyed and influenced by the LRT noise, and 63.2% of interviewed residents once were awakened by the LRT noise. Among various urban noise sources, LRT noise resulted in the largest percentages of highly annoyed residents (30.9%), and acoustic environment was identified by 42.2% of the participants as the most urgent environmental factor to be improved. The preferred control strategies for LRT noise are possible but limited in practice. Moreover, noise sensitivity and age might significantly affect LRT noise annoyance and impact, whereas window glazing and residence time have no significant influence.
近年来，轻轨（LRT）在许多中国城市得到了广泛应用。与平原城市不同，山地城市的城区道路网络密集，建筑物密度高。由于山地城市的特殊形态条件，城市轻轨的噪声影响可能更为复杂和显著。本研究旨在通过一系列现场测量和问卷调查，调查中国西南典型山地城市重庆轻轨沿线居民区的噪声暴露情况。本文将 8 种典型的空间配置归类，以代表轻轨线路与城市山地环境的关系。轻轨沿线居民区的室外和室内声学环境均大大超过国家标准，低频噪声占主导地位，最大可达 15dBA。轻轨噪声在“轨道下方”和“通过”区域比“轨道上方”或“面向”位置更为明显。声学测量与当地居民的主观评价之间具有良好的一致性。噪声较大区域的居民更容易受到轻轨噪声的干扰和影响，63.2%的受访者曾被轻轨噪声吵醒。在各种城市噪声源中，轻轨噪声导致居民高度烦恼的比例最大（30.9%），42.2%的参与者认为声环境是最需要改善的紧迫环境因素。轻轨噪声的首选控制策略在实践中可能但有限。此外，噪声敏感性和年龄可能会显著影响轻轨噪声的烦恼和影响，而窗户玻璃和居住时间没有显著影响。
