地域別騒音の時間的変化 : 東京都内騒音の実態調査第2報

概要

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In each zone defined in the 1st report:i. e. residential, commercial, limited-industrial, one measuring point was selected where sound levels were measured at intervals of one hour through out a whole day (24 hours). At one of the most crowded crossing roads of Tokyo(Hibiya-crossing), the same measurement was repeated. Fig. 1 and Fig. 2 show the variation of sound levels in dB(A) in the day-time. To supplement the above measurement the sound levels were measured at four points in each zone and the noises were magnetically recorded four times in a day(in early morning, in forenoon, in afternoon and at night). The recorded sounds were analyzed to obtain the sound spectra. Fig. 3 and Tab. 1 show the results obtained of course, the sound level in the day-time was much higher than in the night everywhere. And it has become clear that the variation of sound level in the night was characteristic of the zone. For example, the noise durations in which sound levels exceeded 45 dB(A) are remerkably defferent:9 hours(20 to 7 o'clock) in residential zone, hours(1 to 6 o'clock) in commercial zone, 7 hours(23 to 6 o'clock) in limited-industrial zone and 0 in industrial zone. The measured noise levels in busy crossings exceeded 60 dB(A) during the whole day. Fig. 4 shows the sound spectra at every measuring point and time. In geneal, the spectra show a similitude among themselves.
社団法人日本音響学会の論文
1967-07-30