Assessing the changing urban sound environment during the COVID-19 lockdown period using short-term acoustic measurements

IF 1.7 Q2 ACOUSTICS Noise Mapping Pub Date : 2020-01-01 DOI:10.1515/noise-2020-0011
F. Aletta, T. Oberman, A. Mitchell, Huan Tong, Jian Kang
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引用次数: 102

Abstract

Abstract The implementation of lockdown measures due to the COVID-19 outbreak has resulted in wide-ranging social and environmental implications. Among the environmental impacts is a decrease in urban noise levels which has so far been observed at the city scale via noise mapping efforts conducted through the framework of the Environmental Noise Directive. This study aims to understand how lockdown measures have manifested at a local level to better determine how the person-level experience of the urban soundscape has been affected and how these affects differ across urban space typologies. Taking London as a case study, a series of 30-second binaural recordings were taken at 11 locations representing a cross-section of urban public spaces with varying compositions of sound sources during Spring 2019 (pre-lockdown, N = 620) and Spring 2020 (during-lockdown, N = 481). Five acoustic and psychoacoustic metrics (LAeq, LA10, LA90, Loudness, Sharpness) were calculated for each recording and their changes from the pre-lockdown scenario to the lockdown scenario are investigated. Clustering analysis was performed which grouped the locations into 3 types of urban settings based on their acoustic characteristics. An average reduction of 5.4 dB (LAeq) was observed, however significant differences in the degree of reduction were found across the locations, ranging from a 10.7 dB to a 1.2 dB reduction. This study confirms the general reduction in noise levels due to the nationally imposed lockdown measures, identifies trends which vary depending on the urban context and discusses the implications for the limits of urban noise reduction.
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使用短期声学测量评估新冠肺炎封锁期间不断变化的城市声环境
摘要新冠肺炎疫情导致的封锁措施的实施产生了广泛的社会和环境影响。环境影响包括城市噪音水平的下降,到目前为止,通过环境噪音指令框架下进行的噪音测绘工作,在城市范围内观察到了这一点。这项研究旨在了解封锁措施是如何在地方层面表现出来的,以更好地确定个人层面的城市声景体验是如何受到影响的,以及这些影响在城市空间类型中是如何不同的。以伦敦为例,在2019年春季(封锁前,N=620)和2020年春季(封控期间,N=481),在代表不同声源组成的城市公共空间横截面的11个地点拍摄了一系列30秒的双耳录音。为每次录音计算了五个声学和心理声学指标(LAeq、LA10、LA90、响度、清晰度),并调查了它们从封锁前场景到封锁场景的变化。进行了聚类分析,根据其声学特征将这些地点分为3种类型的城市环境。观察到平均降低5.4 dB(LAeq),但发现不同位置的降低程度存在显著差异,从10.7 dB到1.2 dB不等。这项研究证实了由于国家实施的封锁措施,噪音水平普遍降低,确定了根据城市环境而变化的趋势,并讨论了对城市噪音降低极限的影响。
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来源期刊
Noise Mapping
Noise Mapping ACOUSTICS-
CiteScore
7.80
自引率
17.90%
发文量
5
审稿时长
12 weeks
期刊介绍: Ever since its inception, Noise Mapping has been offering fast and comprehensive peer-review, while featuring prominent researchers among its Advisory Board. As a result, the journal is set to acquire a growing reputation as the main publication in the field of noise mapping, thus leading to a significant Impact Factor. The journal aims to promote and disseminate knowledge on noise mapping through the publication of high quality peer-reviewed papers focusing on the following aspects: noise mapping and noise action plans: case studies; models and algorithms for source characterization and outdoor sound propagation: proposals, applications, comparisons, round robin tests; local, national and international policies and good practices for noise mapping, planning, management and control; evaluation of noise mitigation actions; evaluation of environmental noise exposure; actions and communications to increase public awareness of environmental noise issues; outdoor soundscape studies and mapping; classification, evaluation and preservation of quiet areas.
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