Noise Reduction by Barrier Wall | Noise Pollution Control Measures

Noise Reduction by Barrier Wall

Noise Pollution Control Measures

🔊 To reduce noise pollution, barriers or obstruction walls can be constructed between the noise source and the receiver. These barriers reduce the transmission of sound energy.

Noise Reduction Formula

Noise Reduction (dB) = 10 log₁₀ 20H² λR

R Distance between noise source and barrier wall (m)

H Height of barrier wall (m)

λ Wavelength of sound (m)

D Distance between barrier and receiving point (m)

Illustration

✔ Applicability Condition

D ≥ R    and    R >> H

The barrier is generally located close to the source, while the receiving point is relatively far away.

⚙ Engineering Notes

• Higher barrier walls provide better attenuation.
• Low-frequency noise is difficult to block.
• Barrier walls are more effective for high-frequency sounds.
• Increasing H significantly improves performance.

Author

Mohan Dangi
Civil Engineer | Geotechnical Engineer
Environmental Engineering Educator

Disclaimer

This content is intended for educational purposes only. Users should verify calculations with relevant standards, textbooks, and engineering codes before practical application.