Noise Pollution - Different Branches of Biology - Lecture Slides, Slides of Biology

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Environmental Education

Noise Pollution

Content

• Definition of noise
• Characteristics of sound / noise
• Measurement of sound / noise
• Impacts of noise
• Noise pollution in Hong Kong
• Noise control in Hong Kong

Definition of Noise [2]

• How do you define a noise?
• Any unwanted sound can be regarded as ‘noise’

Characteristics of Sound [1]

• Pure sound

Characteristics of Sound [3]

• Amplitude
  • Loudness of a sound
    • Amplitude  vibration in the ear mechanism  brain’s perception  Loudness
• Sound Pressure Level (SPL) (dB)

Characteristics of Sound [4]

• Highest SPL : 194 dB
• Lowest SPL : 0 dB

Characteristics of Sound [5]

• Temporal Variation
  • Sound level change at different time.

Measurement of Sound

• Sound Level Meter

Noise Pollution in Hong Kong [1]

• Types of noise
  • Traffic – engines, exhaust pipes, horns, moving…
  • Aircraft – height, landing and taking-off, aircraft design …

Noise Pollution in Hong Kong [2]

• Types of noise
  • Construction – machines, building demolition …
  • Industrial
  • Domestic – alarming clock, snoring noise, doorbells, radios/TV …

Noise Control in Hong Kong [2]

• Abatement strategies
  • Protecting the recipient
    • Earplugs

Sound Absorption Sound absorption materials

Noise Control in Hong Kong [3]

• Reducing the source of the noise
  • Stringent vehicle design rule
  • Controlling traffic volume and the traffic conditions
  • Paving noise absorption road surface

Noise Control in Hong Kong [5]

• Building noise enclosure

To protect Residents

Noise Control in Hong Kong [6]

• Integrating noise reduction into building design

Noise tolerant portions

Portions not affected by noise

Noise barrier from podium