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In this study, coastal sand dunes characterized by longitudinal dune ridges, swales and parabolic and cup-shaped hollows pits in western part of the Bozcaada Island were discussed based on the grain size parameters, scanning electron microscopy analyses and aerial photo/satellite image interpretations. For the purpose of granulometric analyses, sands collected from uppermost surfaces of dunes at 33 sites along four separate transverse sections were statistically examined, and relationships between sand drift and wind and humidity conditions were evaluated. Based on results of the analysis, it can be concluded that the northerly winds dominate all the year round, particularly during summer period, which corresponds to a maximum deflation stage in dune field when moisture minimizes and desiccant effects of northerly winds dominate. The extension of dune ridges and depressions are in good accordance with wind directions. Furthermore, average grain sizes and uniformity coefficients show a NE-SW distribution, which yields an increasing tendency at this direction. Aerial photo and satellite image interpretations reveal that wind erosion was more efficient to the east-northeast part of the dune field during the period between 1962 and 2008, while deflation was at insignificant level due to growth in vegetation since then. Keywords: Coastal dune, granulometric analysis, deflation period, Batı Burnu, Bozcaada Island.

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