关键词: 新月形沙丘, 新月形沙丘链, 流场, 蚀积量

Abstract: Fixed site observation of sand dunes is an essential link in the studies of sand dune movement. In order to the understand deflation and deposition processes on sand dune surface, three typical shifting sand dunes near Qira Oasis at southern margin of Taklimakan Desert were selected as the observation fields. Of these three sand dunes, two are barchans and one is barchanic chain, with a height ranging between 0.73-3.9m. Under the influence of prevailing wind these sand dunes are migrating towards ESE direction. Through observation of the fluid field, grain size distribution sand transport rate and erosion-deposition changes the authors analysed their variation characteristics and correlation.