Noise attenuation by landscape woody plants, 1; comparisons as a hedge species between Japanese spindle tree and oriental arbor-vitae
1989
Kim, Y.S. (Yeongnam Univ., Kyonsan (Korea R.). Coll. of Agriculture and Animal Science) | Chang, H.G. | Kim, Y.H. (Yeongnam Univ., Kyonsan (Korea R.). Coll. of Science)
Effects on noise attenuation of the hedge species, Thuja orientalis L. and Euonymus japonicus Thunb., widely used as road side hedges, were analysed at the frequencies of 1,000, 2,000 and 3,150 Hz., respectively. The present experiments were carried out both in the field and in a Semianechoic Chamber. By increasing the distances from the noise source, attenuation rates of noise level were increased at high frequencies. But the attenuation rates of the noise level at low frequencies showed varied as the distances increased, and this trend appeared to be caused by the influence of ground waves. Generally, in this experiment, Thuja orientalis L., which is a coniferous species, showed more effective on the abilities of noise attenuation than that of Euonymus japonicus Thunb., which is a broad-leaved evergreen species
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