《环境影响评价》课程教学资源（英文课件）8 Noise Environmental Impact Assessment

中国地质大学(武汉）CHINA UNIVERSITYOFGEOSCIENCESNoiseEnvironmentalImpactAssessment

Noise Environmental Impact Assessment

DefinitionAmbient noise:The surrounding living environment will be interfered bysound which produced in industrial production,construction, transportation and social life.(Frequency20Hz～20kHz,Audible soun

Definition  Ambient noise: The surrounding living environment will be interfered by sound which produced in industrial production, construction, transportation and social life.(Frequency: 20Hz～20kHz, Audible sound range)

Fixed sourceThe location of the sound source does notmove during the voice time.MobilesourceThe location of the sound source will moveaccording to a certain track during thevoice time

 Fixed source The location of the sound source does not move during the voice time.  Mobile source The location of the sound source will move according to a certain track during the voice time

PointsoundsourceThe sound waves are radiated in spherical form. The amplitudeof sound pressure is in inverse proportion to the sound wavepropagation distanceTo any shape of sound, when the sound wavelength is muchlarger than the geometric size of the sound source, the soundsourcecan be asthe pointsound sourceLinesound sourceThe amplitude of sound pressure is in inverse proportion to thesquare root of sound wave propagation distanceAreasoundsourceTheamplitudeof soundpressure will notchange withsoundwavepropagationdistance

 Point sound source The sound waves are radiated in spherical form. The amplitude of sound pressure is in inverse proportion to the sound wave propagation distance. To any shape of sound, when the sound wavelength is much larger than the geometric size of the sound source, the sound source can be as the point sound source.  Line sound source The amplitude of sound pressure is in inverse proportion to the square root of sound wave propagation distance  Area sound source The amplitude of sound pressure will not change with sound wave propagation distance

20dB

60dB

90dB

140dBO000

Noise standard (Limits)LevelDayNightdB(A)dB(A)05040155452605036555470554a4b7060

Level Day dB(A) Night dB(A) 0 50 40 1 55 45 2 60 50 3 65 55 4 4a 70 55 4b 70 60 Noise standard (Limits )

MonitoringA sound level meterProject's locationAnalysis of noise sources already exist;Analysis of noise sensitive objects (residential buildingschool, hospital, hotel,... Day sample, night sample Draw a map for the results

 Monitoring  A sound level meter  Project’s location  Analysis of noise sources already exist;  Analysis of noise sensitive objects (residential building, school, hospital, hotel,.)  Day sample, night sample  Draw a map for the results