Investigation of the noise reduction provided by tree belts

Fang, Chih-Fang; Ling, Der-Lin

doi:10.1016/s0169-2046(02)00190-1

Cited by 205 publications

(88 citation statements)

References 6 publications

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“…This result is in agreement with that of Cook and Haverbeke (1974) and Fang and Ling (2003). In addition, a negative relationship exists between the receiver and noise source height and the relative attenuation (Table 2).…”

Section: Discussionsupporting

confidence: 92%

“…The ambient noise was maintained at 48± 2 dB A. Each tree belt exceeded 50 m in length beyond which belt length has no effect on noise reduction according to Fang and Ling (2003). The characteristics of the six tree belts are shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…The difference between the mean sound pressure level behind the tree belt and that on the open ground at each corresponding measuring site represents the net noise reduction, or relative attenuation, due to the tree belt. The noise source, method of noise measurement, and the weather conditions used in this study were the same as previously reported by Fang and Ling (2003).…”

Section: Experimental Designmentioning

confidence: 99%

“…The visibility through the tree belt, i.e., the distance that an object is obscured by the plants, was measured to indicate the density of tree leaves and branches of the belt as suggested by Eyring (1946), Embleton (1963), and Fang and Ling (2003). Researcher A stood at one side of the tree belt to be measured while researcher B wearing a white glove stretched his hand into the tree belts on 10 cm increment until researcher A was unable to see the white glove.…”

Section: Visibility Measurementmentioning

confidence: 99%

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Guidance for noise reduction provided by tree belts

Fang

Ling

2005

Landscape and Urban Planning

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147

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The effects of noise reduction of six tree belts were examined. An amplifier was placed in front of each tree belt, while a noise meter was placed at various heights and distances behind the tree belt. Net noise reduction effect termed as "relative attenuation" was obtained by subtracting the sound pressure level at each measurement site behind the tree belt from the sound pressure level at equal distances over open ground. Five parameters, including visibility, height, and width of the tree belt, height of receiver and noise source, and the distance between noise source and receiver, were studied. A multiple regression model demonstrating the order of importance of the five parameters in relation to relative attenuation was developed. The five parameters were then transformed into three-dimensionless parameters, i.e., h : receiver and noise source height/tree height, d : distance between noise source and receiver/tree height, and m : belt width/visibility. By plotting the relative attenuation on the coordinate axis of h , d and m and curve fitting, a three-dimensionless map of noise reduction by tree belts was formed. The map can be used as guidance in designing three belts for noise reduction in environmental planning.

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Section: Discussionsupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Experimental Designmentioning

confidence: 99%

Section: Visibility Measurementmentioning

confidence: 99%

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Guidance for noise reduction provided by tree belts

Fang

Ling

2005

Landscape and Urban Planning

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147

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“…Thus it was concluded that tree belts and shrubs should be planted together to provide best attenuation performance. 9 Tarrero et al 10 carried out an experimental investigation of the sound attenuation in different types of forests with different tree densities, different trunk diameters, and both deciduous and evergreen leaves. The measured data at several source-receiver distances showed that the trees have a noticeable effect on sound attenuation at longer distances of more than 40 m. However, if the trees are planted densely, then the attenuation effect due to trees can be seen at shorter ranges.…”

Section: Introductionmentioning

confidence: 99%

Sound propagation over soft ground without and with crops and potential for surface transport noise attenuation

Bashir

Taherzadeh

Attenborough

2015

The Journal of the Acoustical Society of America

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Growing demand on transportation, road, and railway networks has resulted in increased levels of annoyance from road traffic. Optimized use of green surfaces in combination with vegetation may be desirable as a method for reducing the noise impact of road traffic in urban and rural environments. Sound propagation over soft ground and through crops has been studied through outdoor measurements at short and medium ranges and through predictions. At lower frequencies, ground effect is dominant, and there is little or no attenuation due to crops. At higher frequencies above 3-4 kHz, the attenuation in crops is dominant. It was also found that the ground effects and the influence of crops can be treated independently and can be added to obtain the total effect. Sound attenuation by crops is the result of multiple scattering between the stems and leaves, loss of coherence, and viscous and thermal losses due to foliage. The major contribution is associated with viscous and thermal losses. A model for sound attenuation by vegetation is proposed. Insertion losses for a typical road traffic noise source have been calculated that result either by replacing hard ground with different types of acoustically soft ground or by growing crops along the road sides.

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Introduction

2017

Applied Tree Biology

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Investigation of the noise reduction provided by tree belts

Cited by 205 publications

References 6 publications

Guidance for noise reduction provided by tree belts

Guidance for noise reduction provided by tree belts

Sound propagation over soft ground without and with crops and potential for surface transport noise attenuation

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