Traffic Noise Levels at Different Locations in Dhaka City and Noise Modelling for Construction Equipments

摘要

Development of a suitable infrastructure is a sine-que-non for rapid economic growth in a developing country like Bangladesh. Noise emission is one of the major concerns for a mega city like Dhaka. A large civil-structured project is being implemented in Dhaka, which is known as Jatrabari-Gulistan flyover. Main focus of this research was concentrated to record and analyze noise levels in major intersections located at the study area as well as key entities, such as hospitals, educational institutions; religious institutions etc. for both day and night and seven days of a week. Average noise level was found 92.7 dBA at Jatrabari intersection during construction period and 86.6 dBA during normal period. To compare the noise level during operation phase and construction phase two other similar civil structured projects, Khilgaon and Kuril flyover were selected and same operation was carried out. In this regard, noise related parameters such as Leq, L10, L50, and L90 have been estimated from field observations of noise levels. It was observed that at all locations; noise level remained far above the acceptable limit. Comparisons have been made considering various factors of noise level and contour, vector and wireframe diagram was prepared for the intersections and along the route in the study area. Noise modelling was done for generator and wheel loader used in the construction site of flyover