INSERSION LOSS STUDY DUE TO NOISE BARRIERS CONSTRUCTED ALONG FLYOVERS IN THE CITY OF LUCKNOW

ENVIRONMENTAL ENGINEERING

Residents living near urban roads and major highways have become concerned about noise pollution. It has become essential to construct noise barriers along traffic roads in order to decrease the intensity of noise to an acceptable level in nearby residential areas. There are different zones in Lucknow city based on its land use in order to study the noise levels due to vehicle movement. The noise data analysis also takes other factors into account, including terrain, traffic speed, cross sections, and traffic composition. This paper highlights the noise levels at the fly over situated on Talkatora road(D1), Tulsi Das Marg(D2) and Nirala Nagar(D3) (Lucknow, UP, India) are selected for the study and the heights of the noise barrier installed were 1.35m ,0.62m, and 1.22m (with edge 0.24m) respectively. Barrier height, type of traffic, ground equivalence, height of measuring instrument and barrier material are taken into consideration. The readings were taken at one side of barrier panel at the time when no traffic was present and only a single noise source was chosen. The pavement material is same and instrument has been kept 1.5m behind the barrier and then 1 m above the barrier on all the three sites. Due to the presence of noise barrier the reduction in noise as insertion losses with respect to presence of barrier were found to be upto 8.4 dBA at site D1(barrier height = 1.35 m), upto 5.3 dbA at site D2 (barrier height =0.62m),) and upto 12.3 dbA at D3(barrier height = 1.22m with edge 0.24m). Also, it was inferred that due to presence of edge on site D3, there is less diffraction of sound waves from the top edge of barrier. This result was compared with CPCB and all the three barriers have proved to be efficient as they are reducing the noise of more than 5 decibel.

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