关键词: 风沙地貌, 堆积地貌, 沙丘链, 风沙作用, 宽谷, 半固定, 新月形沙丘, 堆积物, 沙堆, 形态类型

Abstract: Acolian landform and sand accumulation develops in some areas on Qinghai-Tibet Plateau, especially along the upper and middle reaches of Yalut-sangpo River Valley, the landform prevails typically. It consists mainly of barchans, dune chains, sand mounds and sand sheets.They are the typical landform in the river valley. Shifting sand dunes, fixed and semi-fixed dunes are the tow major types of dune. The direction of the strong west wind is prevailling with the west-oriented terrain of Yalutsangpo River Valley and the shifting sand dunes caused locally on the paleo-aeolian sedimentary which is considered in the study as that it is closely related to the loess-like deposits in the valley. Aeolian sand brings more influences and harms to the development of the area and there exists the trends of the development of desertification in the Yalutsangpo River Valley where human economic activities is concentrated and more attention for rational developing should be paid.