Relationship between wind environment and grain-size distribution of sand in Tottori Sand Dune

摘要

Distribution of wind speed and direction were observed in Tottori Sand Dune and the granulometric analysis was conducted using surface sands of this area. Median diameters and sorting coefficient of the sand were used as indexes of grain-size distribution in the granulometric analysis. The general properties of wind effect to sand movement were analyzed using the wind data of Arid Land Research Center, Tottori University, adjacent to fhr observation field. The wind route and the area of strong windand weak wind were confirmed by the mobile observation when the NNW wind was dominant in Tottori Sand Dune. In addition, the distribution of wind speed and direction, median diameter and sorting owffkienf of sand, topography and vegetation were compared.The results show the effects of topographies and vegetation on grain-size distribution and some relations between winds and the grain-size distribution.