The effect of tree covers on reducing noise pollution load in Saravan Forest Park, Guilan Province, Iran

This study was carried out in the Saravan Forest Park in north of Iran. The sound level measurements were performed at ۱۲ stations and at distances of ۳, ۱۰۰, ۲۰۰, ۴۰۰ and ۱۰۰۰ m from the sound source with three replicates, in the summer and in traffic hours from ۱۰ AM to ۲ PM an area without tree cover was selected as the control station. The results indicated that sound intensity at first distance (۳ m) with the mean of ۷۷.۸۱ decibel (dB) exceeds the national standard of Iran. In this study, the first significant decrease in the sound intensity was obtained at a distance of ۱۰۰ m, with the highest reduction of ۲۶ dB for station ۱۰, while the lowest decrease was found at station ۱۱ with ۸ dB. In an overall summary, distances less than ۲۰۰ m are not suitable for tourism accommodation. The average sound intensity at distances in comparison with the permissible value indicate that the park does not currently have any noise pollution at more than ۲۰۰ m in summer.

کلیدواژه ها:

Noise Pollution ، plant cover ، Distance effects ، Seasonal variation