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pollution that negatively affects both aquatic and terrestrial species. In this study, it was aimed to develop a GIS-based noise propagation model considering the noise emission caused by the chainsaw used in tree cutting stage of a forest harvesting operation in Karacabey Flooded Forest within the border of Bursa province in Türkiye. The noise propagation map was produced by using SPreAD-GIS in order to predict the noise level caused by the chainsaw to which the operator and other forest workers working in the harvesting area are exposed. On the other hand, there are a total of 126 bird species in the Karacabey Flooded Forest. In the study, the effects of chainsaw-induced noise on bird species in flooded forest were also evaluated using the noise propagation map. MATERIAL AND METHOD MATERIJALI I METODA Study Area – Područje istraživanja The study was conducted during tree harvesting operation taken place in Section 52 within the border of Karacabey Flooded Forest. The main land cover types in the flooded forest are terrestrial forest, agricultural land, pasture and sand dune (Akay et al. 2017) (Figure 1). The geographical location of the study area is between 40º23’38 “- 40º21’43” North Latitude and 28º23’02”- 28º52’21” - 28º34’01” East Longitudes. In the study area, the total forest area is approximately 1200 hectares and the average altitude from the sea is 15 m. The dominant tree species in the flooded forest are ash, oak, alder, willow and poplar, and there are pistachio and larch within the territorial forest boundaries. There are 126 bird species identified through field observations in the flooded forest. Most of these birds are resident species that breed in the area during the spring season. Noise analysis – Analiza buke Noise level measurements were conducted during the harvesting activities carried out in 2019 in the alder stands located in the flooded forest. The noise level caused by the Husqvarna 365 model chainsaw in tree cutting operation was recorded at 1-second intervals using a PCE 430 Class 1 noise meter. A portable meteorology station (TFA Nexus Funk-wet) was used for measuring climate data (Figure 2). Noise measurements were recorded in 1/1 and 1/3 octave bands between 22-136 dBA and 3 Hz-20 kHz frequency range. When measuring the noise level to which the chainsaw operator was exposed, the noise meter was kept close to the operator’s ears (30 cm). In the field measurements, it was ensured that there was no other noise source in the working environment in addition to the chainsaw noise. In order to determine the natural noise level, noise measurements were performed during the period when the chainsaw was not operated and no noise source was active in the area. Within the scope of statistical analysis, tree diameters were divided into three classes (small: < 30 cm, medium: 30-34 cm, large: > 34 cm) to investigate the effect of tree diameters on the noise level caused by the chainsaw. The ranges of the diameter classes were determined considering the tree diameter data obtained in the field study. The |