Practical analysis of the influence of basic meteorological phenomena on the long-term noise level

Abstract

Current regulations on the prognosis of the acoustic climate outdoors require that meteorological conditions should be examined as part of long-term noise level calculations. The impact of meteorological conditions on the noise level was analysed using simulation calculations performed with NMPB-96 method and Mithra software. Their aim was to determine the relationship between the value of these influences and the distance between the receiver point and the noise source and its height above the ground.The distance between a source and the built-up area varied. A number of its locations in relation to the built-up area ranging between 200m and 4 000 m were considered. The built-up area consisted of a row of 11-storey buildings ca. 600 m long. The ground floor height and the floor height were accepted to be 3.5 m and 3.0 m, respectively. Calculations were performed for various meteorological conditions: from P=0 (homogenous conditions) to P=1.0, increasing by every 0.1. The receiver point was located 2 m away from the façade at varying heights: from the lowest point positioned at 5 m to the highest point at 27.5 m, increasing by 2.5 m, which corresponds to the median position of each successive storey, from first floor to tenth floor.