黄河两岸沙丘粒度特征分析

here are various types of sand dunes on both sides of the Yellow River.The main sand dunes are latticed dunes and barchan dunes.On the spot sand samples were collected and the characteristics of grain size were analyzed in laboratory.The result show that the majority grain size of latticed sand dunes is 0.063~0.125mm,and the next is 0.25~1.00mm.The majority grain size of barchan sand dunes are 0.063~0.125mm and 0.125~0.25mm .The grain of two dunes is good in sandsorting,which had been selected by wind.Analysis of the two sand dunes types and the interrelation between grain size parameters of the sand dunes in different geomorphic units,the mechanics of the two types of sand dunes and the characteristic of grain size parameters variation in different geomorphic units have been discussed in this paper.