共查询到17条相似文献,搜索用时 93 毫秒
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机场周围飞机噪声测量的影响因素分析 总被引:1,自引:1,他引:0
简要回顾了机场周围飞机噪声的测量方法、评价指标;针对测量过程中存在的问题,从测量周期、飞行架次分布、机型的代表性、环境背景噪声等几个方面考察了对测量数据的影响,对机场周围飞机噪声测量的影响因素进行了分析;论证了缩短测量周期的可行性,当每天的飞行架次在200架左右时,以3 d取代7 d的做法较为可行;对于飞机噪声测量过程中存在的问题,提出了个人看法和建议。 相似文献
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广州市昼夜道路交通噪声的监测与分析 总被引:7,自引:1,他引:6
对广州市的昼夜交通噪声污染现状进行了分区域分道路等级的实地监测,得到共53个监测点位白天和夜晚的等效声级及其统计声级,同时对每个监测点展开了交通流调查,并分析交通流特征对交通噪声的影响。监测结果表明, 白天快速路、主干路、次干路及支路的平均等效声级分别为74.2、72.2、67.8、65.1 dB,快速路及主干路沿线的交通噪声污染比次干路及支路的严重。夜晚所有测点的噪声值均超过55 dB,快速路、主干路、次干路及支路的平均等效声级分别为72.2、72.3、66.3、64.5 dB,广州市夜晚的交通噪声污染较为严重。 相似文献
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郑惠君 《环境监测管理与技术》2003,15(6):21-22
为了解船舶航运噪声对周围环境的影响,南平市环境监测站于2002年对延平湖城区船舶航运的环境噪声进行了监测。结果表明,延平湖现有航运船只产生的噪声均属于高噪声源;昼间船舶航运时,噪声监测值基本可达4类区域标准值;夜间船舶航运时,噪声超标严重,超标率为60%,其中最大超标4.4dB(A);而无船舶航运时,噪声监测值均达标,接近2类区域标准值。 相似文献
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1 实验 淮安市环境监测站开展了固定和流动噪声源在不同距离,对不同高度建筑物影响的噪声监测,监测点设在该市淮海国际大酒店各楼层临近阳台的窗口,共设置7个监测点,监测点距离地面高度(垂直高度)分别为1.5 m、12 m、17 m、23 m、30 m、35 m、42 m.监测方法按照GB/T 14623-1993<城市区域环境噪声测量方法>和<环境监测技术规范>(噪声部分),监测仪器为噪声积分统计分析仪.固定声源监测频次:监测4次,每次测10 min,以等效声级(Leq)值参加统计;复合声源按功能区测量方法监测,监测4次,每次为24 h连续监测,测量每小时的Leq值,实测20 min,Leq值参加统计,同时记录车流量.噪声监测点见图1. 相似文献
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选取北京市近5年夏半年(4—9月)的降雨数据及相关噪声自动监测小时等效声级,利用数学统计软件进行有雨-无雨声级差异性分析、声级-降雨相关性分析及平均声级-雨量变化趋势分析等,提出降雨确实对噪声自动监测小时数据有一定贡献,不同雨量对不同功能区噪声影响不同,建议噪声自动监测系统建设时应考虑雨噪声影响,以保证对声环境质量评价的科学性和准确性。 相似文献
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The City of Amman, Jordan, has been subjected to persistent increase in road traffic due to overall increase in prosperity, fast development and expansion of economy, travel and tourism. This study investigates traffic noise pollution in Amman. Road traffic noise index L
10(1 h) was measured at 28 locations that cover most of the City of Amman. Noise measurements were carried out at these 28 locations two times a day for a period of one hour during the early morning and early evening rush hours, in the presence and absence of a barrier. The Calculation of Road Traffic Noise (CRTN) prediction model was employed to predict noise levels at the locations chosen for the study. Data required for the model include traffic volume, speed, percentage of heavy vehicles, road surface, gradient, obstructions, distance, noise path, intervening ground, effect of shielding, and angle of view. The results of the investigation showed that the minimum and the maximum noise levels are 46 dB(A) and 81 dB(A) during day-time and 58 dB(A) and 71 dB(A) during night-time. The measured noise level exceeded the 62 dB(A) acceptable limit at most of the locations. The CTRN prediction model was successful in predicting noise levels at most of the locations chosen for this investigation, with more accurate predictions for night-time measurements. 相似文献
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Skarlatos D 《Environmental monitoring and assessment》2003,85(1):55-67
A common practice in random noise measurements is to assume that the noise samples are normally distributed. Since the sound pressure level (L
p) is related with the sound energy by a non linear equation, the distribution of the two variables will be different. If one assumes that the probability density function (pdf) of L
p is normal, the pdf of noise energy is not and vice versa. A simple criterion based on statistical properties of sampled noise can be used for the determination of the kind of distribution of the measured noise. The case in which the noise energy emitted by the source, and the case in which the measured noise level is normally distributed are examined. For each case confidence intervals of the calculated equivalent level are calculated. 相似文献
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介绍一种自动、高效测量机场周围飞机噪声的技术方法"阈值浮动技术",即噪声测量仪的运行阈值随环境背景噪声的高低而自主浮动的技术。利用该技术,当被测飞机噪声声级高于运行阈值时,噪声测量仪启动"记录、分析、录音"等程序的运行;当被测飞机噪声声级低于运行阈值时,停止相关程序的运行。由于运行阈值是浮动的,因而实现了机场周围飞机噪声的自动、高效和准确测量。给出了实现"阈值浮动技术"的计算机算法,并列举了测量实例对该项技术加以验证,证明了该技术方法行之有效。 相似文献
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The present study provides an evaluation of noise pollution in six Urban Parks located in the city of Curitiba, Brazil. Equivalent
noise levels (L
eq) were measured in 303 points (each point measured during 3 min) spread throughout the Parks. Measured values were confronted
with local legislation (Law 10625) allowed limits, and the Parks were thus classified as “acoustically polluted or unpolluted”.
Measured values were also evaluated according to international legislation: Decree no. 12 of the City Council of Rome, DIN
18005 for German cities, the World Health Organization, and the United States Environmental Protection Agency. Urban parks
in the downtown area of Curitiba, surrounded by roads of heavy traffic and in the midst of intense commercial activities,
do not satisfy any of the standards used. The most noise-polluted parks in Curitiba were the Public Walk Park and the Botanical
Garden Park, with measured L
eq of 64.8 dB(A) and 67 dB(A). 相似文献
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侯天兰 《环境监测管理与技术》2004,16(5):40-41
应用统计分析方法,对湖南省湘潭市2001年城区环境噪声网格布点及其监测结果总体进行了区域环境噪声监测点的最优集合,并通过网格布点法与优化布点法对该市2002年和2003年环境噪声监测结果进行了对比检验,结果表明,两种方法监测的等效声级和标准差平均值均<1dB(A),监测结果之间无显著性差异。 相似文献