Determination of roadside noise reduction effectiveness of Pinus sylvestris L. and Populus nigra L. in Erzurum, Turkey

Abstract

This study was carried out to determine the noise-reduction effectiveness of the Pinus sylvestris L. and Populus nigra L. trees along the E-80 State highway in Erzurum-Turkey. Noise values were taken at three measurement points; open (without trees and taken as control), the urban forests of pure P. sylvestris L. and P. nigra L. areas, and at four different distances; 0 (near the noise source), 25, 50 and 75 m from the noise source. At the distance of 25 m from the source, the noise value was 78.5 dB(A) in the control area, which was reduced 75.5 dB(A) and 69.2 dB(A) in the P. nigra L. and P. sylvestris L. areas, with the reduction rates of 24.7 and 31% compared to the control, respectively. This value was 69.6, 67.1 and 64.3 at the distance of 50 m and 64.9, 62.5 and 59.2 at 75 m for the naked, P. nigra L. and P. sylvestris L. areas, respectively. From the results of the study, it was suggested that for the noise pollution from the traffic flow on the roads, in especially the big cities, noise reduction zones with suitable width and plant species should be formed along the main arteries of the cities.

Preferences for street configuration and street tree planting in urban Hong Kong

“…Urban greening can mitigate the urban heat island (UHI) effect and improve thermal comfort by moderating micro-climatic conditions (Avissar, 1996;McPherson, 1992;Park et al, 2012;ShashuaBar et al, 2009;Taha, 1997) and provide shading (Dimoudi and Nikolopoulou, 2003;Ali-Toudert and Mayer, 2007;Shahidan et al, 2012). It can bring other benefits including the ability to attenuate noise levels (Ozer et al, 2008;Islam et al, 2012;Van Renterghem et al, 2012), improve air quality (Akbari et al, 2001;Jim and Chen, 2008;Nowak et al, 2006) and reduce urban storm water runoff (Bartens et al, 2008;Armson et al, 2012).…”

Karakteristik Jalur Hijau dalam Meredam Kebisingan di Permukiman Sekitar Jalan Tol Jagorawi

“…Tingkat reduksi kebisingan pada plot 3 sebesar 3.43 dB(A) dengan nilai efektivitas 3.18%, sehingga pengaruh keberadaan vegetasi pinus dapat menaikan nilai reduksi kebisingan sebesar 1.18 dB(A). Berdasarkan penelitian Ozer et al (2008), kumpulan Pinus sylvestris mampu mengurangi kebisingan sebesar 9.3 dB(A) pada jarak 25 m dan 5.3 dB(A) pada jarak 50 m dari sumber kebisingan. Kemudian hasil penelitian Kim et al (1989) yang diacu dalam Widagdo (1998), menunjukkan bahwa tanaman Thuja orientalis (konifer) mengurangi kebisingan lebih efektif daripada tanaman Eunymus japonicus (berdaun lebar).…”

“…Nilai korelasi jumlah baris yaitu 0.50 yang berarti berkorelasi sedang. Ozer et al (2008) menyebutkan bahwa kerapatan, tinggi, panjang dan lebar (ketebalan) jalur/sabuk hijau merupakan faktor paling efektif dalam mengurangi kebisingan. Penanaman beberapa spesies vegetasi secara bersamaan akan lebih efektif dalam mengurangi kebisingan daripada menanam vegetasi dari satu spesies (Carpenter et al 1975).…”

Towards governance on noise between municipality and terminal operator by the use of simulation modelling

“…Such a container wall can reduce the average noise level in the neighbourhood by 8-10 dB. In addition, the municipality can create some greenbelts around the terminal which can lead to an additional noise reduction of 5 dB(A) on the average [58].…”