Abstract
Many decibel-based noise indicators are used in noise policy to evaluate aircraft sound in the environment. Among those, day–evening–night-weighted sound pressure level ( L den ), day–night-weighted sound pressure level ( L dn ), and nighttime average sound pressure level ( L night ) are the most widely used. However, the designation of reference time intervals (e.g., day, evening, and night) differs depending on the country’s lifestyle and culture. A dataset—extracted from socio-acoustic surveys conducted in Vietnam (2005–2019)—was analyzed to investigate temporal patterns of the Vietnamese lifestyle and changes in L den , L dn , and L night when temporal interval segmentations in these indicators were adjusted. Traffic congestion hours, go-to-bed time, and wake-up time in southern Vietnam were approximately one hour later than those in northern and central Vietnam. Further, a small-scale and Internet-based questionnaire survey on Vietnamese life rhythms was conducted to examine Vietnamese people’s daily behaviors. These data were compared with the relevant data of Japanese individuals, extracted from the Survey on Time Use and Leisure Activities of Japan. Differences in sleeping times and mealtimes were found between Japanese and Vietnamese data. We suggest an appropriate reference time interval for aircraft noise policy in Vietnam, referring to the current national and international noise standards and regulations.
Highlights
The results of analyzing wake-up and go-to-bedby times using the data from the socio-acoustic curve for aircraft noise annoyance in Vietnam, plotted a logistic regression function (Figure 12), was surveys in Vietnam from 2007 to 2017, as shown in Section 3, indicated that the time intervals’
The validity of time interval segmentation for environmental noise indicators was examined based on the data analysis of past questionnaire surveys conducted in Vietnam
The results showed that Vietnamese citizens wake up between 5:00 and 6:00 and go to bed between 22:00 and 23:00 This differed from the time segmentation in the current regulation on environmental noise in Vietnam, in which two reference time intervals of daytime (6:00 to 21:00) and nighttime (21:00 to 6:00) (QCVN 26:2010/BTNMT) were adopted
Summary
The growth of aviation has enriched people’s lives by connecting people and places. It has led to an environmental problem—aircraft noise. As one of the world’s fastest growing economies, Vietnam is planning many new airports and implementing airport expansion to handle the country’s stressed aviation infrastructure [1]. The impact of aircraft noise is especially serious for residents living in areas close to these new and expanded airports. Vietnam has no noise criteria or regulations applicable to managing the sound environment around airports, except those for general environmental noise [2]. In response to the development of air traffic and airport development in Vietnam, the establishment of an aircraft noise policy is an urgent issue
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