Scenario of noise hazard in industries of Bangladesh: Spatial noise mapping approach
Debatosh Banik Partha*, Md. Saiful Islam
Noise levels in five industries of Khulna city were studied.
Depiction of noise climate is presented based on noise indices.
Spatial contouring noise maps were developed using ArcGIS.
Comparison on degree of noise pollution caused by the industries was implicated.
Noise abatement strategies and different control measures were prescribed.
Noise pollution gained much attention in recent years for its insidious specialty of projecting its effects on individuals where individuals can hardly notice noise as the cause. Developed countries are handling this issue by applying various act and legislation such as Directive 2002/49/EC (END) with innovative engineering control ways like less vibratory foundations, sound screening, mandatory earplugs to reduce the catastrophe of overall noise pollution. This study aims at one of the most affected sectors of noise pollution, the industries, to assess the noise levels produced by the industries and establish a rigid scenario of industrial environment quality. Five industries under distinct categories of Khulna city, Bangladesh were selected and sound pressure levels from exact locations were extracted using an environmental meter along with a GPS meter. Noise pollution indices (L10, L50, L90, NC, NEI, Leq and Lnp) were determined from raw noise data and indicative noise maps were developed based on these indices using ArcGIS. Study shows that the maximum average Leq derived from other indices was 94.4 dB (A) for jute industry followed by 93.5 dB (A), 87.3 dB (A), 85.3 dB (A) for power generation, metal & steel, and electrical equipment industry, respectively which exceeds the sound limit (85 dB A) described by Occupational Safety and Health Administration (OSHA). Results of noise mapping show that the propagation of noise spurred from the sources to the boundary edges of the industries. This study is an aggregate assessment of the industrial environment quality based on noise pollution presented by the amalgamation of two different approaches, i.e. noise indices and spatial noise mapping. It opens the scope of assessing noise levels in different sectors tarnished by noise pollution and helps to understand the core characteristics of noise pollution easily.
To cite this article: Partha DB, Islam MS. Scenario of noise hazard in industries of Bangladesh: Spatial noise mapping approach. Journal of Advanced Civil Engineering Practice and Research 2019;8:17-25.