Abstract
The prediction of noise levels at selected remote locations is an integral part of estimating the environmental impact of new stationary sources or of noise reduction for existing facilities. A three-dimensional computer model, with provisions for temperature and humidity variation and for solid barriers and semitransparent arrays such as process plants or forests, predicts the composite noise level produced at remote locations by many sources. The output also shows the individual octave band contributions of the more important sources, ranked by their A-weighted level at each observer location. These features enable the model to be used for a variety of purposes, including Environmental Impact Statements, site selection and layout of process plants, determination of required noise limits on new equipment, estimation of the effect of major noise barriers, determination of the feasibility of meeting noise ordinances, and optimization of cost-effectiveness of noise control measures.
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