重庆市主城区主要交通干道噪声51年之变迁

Noise Change along Traffic Arteries in Chongqing City in 1960—2011

目的探讨重庆市主城区主要交通干道噪声51年的变化,以便更好地采取防治措施。方法从1960—2011年共5次定点不定期监测重庆市主城区主要交通干道噪声级的变化,同时记录10 min内来往的车流量数。结果所有监测点主干道交通噪声等效A声级白天均超过国家噪声标准,最低为71.3 d B(A);24 h监测结果仅凌晨4:00未超标,为45.8 d B(A)。从1960—2011年,车流量逐年增多,最多增加21倍,然而从总体上看噪声变化趋势不明显:2011年等效A声级比1960年和1997年分别增加了5.77d B(A)和0.57 d B(A),但比1983年和1993年分别降低了4.88 d B(A)和0.68 d B(A)。结论重庆近几十来在车流量逐渐增多的情况下,交通干道噪声总体变化趋势不明显,表明在治理交通噪声方面已取得一定效果。

Objective To investigate the change of noise along traffic arteries in Chongqing city and to explore better control measures. Methods The noise along traffic arteries and the number of vehicles in 10 minutes were tested five times at fixed monitoring sites in 1960—2011. Results The equivalent sound level（ Leq） of noise in day-time at all monitoring sites were higher than the national standard limits,which was 71. 3 d B（ A）. The results of monitoring for 24 h indicated that the noise only in 4： 00 AM was lower than the national standard limit,which was 45. 8 d B（ A）. The vehicle flowrate was 21 times more in 2011 than that in 1960,but the change trend of noise was not obvious. The Leq in 2011 was 5. 77 d B（ A） higher than that in 1961 and 0. 57 d B（ A） higher than that in1997,but the Leq in 2011 was 4. 88 d B（ A） lower than that in 1983 and 0. 68 d B（ A） lower than that in 1993.Conclusions Under the situation of increasing vehicle flowrate,the change trend of noise was not obvious along traffic arteries in the past fifty one years,which indicated that the control measures worked efficaciously.