Aeolian Elements of Sand-dunes in the Middle Reaches of the Yangtze River based on Typical Sections

In a comprehensive survey of typical sections in the sand-dunes distribution area in the middle reach of the Yangtze River and Boyang Lake around,research shows that the grainsaize of sand-dunes deposits exhibit typical feature of aeolian sands: the distribution of sand-dunes is strap-shaped,which spread from north to south,and inosculate with the path of wind,and the height of sand-dunes is corresponding with the size of wind.All evidences show that these sand-dunes should be mainly caused by wind.