地域別騒音の場所的分布 : 東京都内騒音の実態調査 第1報
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概要
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In Tokyo the whole city part is classified into four zones, i. e. residential, commercial, limited-industrial and industrial, according to the town-and-city planning. In the above mentioned four zones and suburban zone, 17 typical areas (each about 100, 000m^2) were selected and the noises (out of door) were measured at 20 points in each area. for two months beginnig with Dec. 1965. At each point sound levels in dB(A) were measured by a sound level meter, 50 times at intervals of 5 seconds and medium and the range were obtained statistically from these 50 data to represent the noise level distrbution. These procedures are in accordance with the Japanese Industrial Standard JIS Z-8731"Methods of Measurement of sound levels". Fig. 1 and Tab. 2 show anexample of the detailed data and the average sound level at 20 points in a commercial zone. Other results are shown in Fig. 2 to Fig. 8, Tab. 3 gives the summarized result. Tab. 4 is a comparison of sound levels obtained by different methods of selection of measuring points, where one is arbitrary and another random in the same area. The meaning of arbitrary and randorm selection is as follows. In arbitrary selection the observation points were selected so as to represent the general level of noise in the area. In random selection the points were determined by a purely statistical method on the map as is shown in the figure. Main results are as follow. (a)Residential zone:Average sound level is about 50 dB(A). That makes little difference between 3 classes (A, B, C of Tab. 1) classified by the average residential site area. Sound levels are estimated to be under 50 dB(A) in 2/3 of the area of this zone. (b)Commercial zone:In this zone the sound levels are generally high(64dB(A) in average), often becoming as high as 80dB (A) or over on tram way roads. (c)Limited-industrial zone:The sound levels are usvally high in the vicinity of factories, but the traffic volume is not large in comparison with commercial zone and the sound levels are a little lower. In 50% of the area the sound level is under 60dB(A). (d)Industrial zone:The average sound level slightly exceeds 60dB(A). But there is no significant difference between industrial and limited-industrial zones. (e)Suburban zone:The average sound level is under 45dB(A). It may be noticed that there is a remarkable difference between urban and suburban zones mainly due to traffic noise.
- 社団法人日本音響学会の論文
- 1967-07-30
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