选巴丹吉林沙漠典型高大沙山(1 605 m)为研究对象,对沙山沉积物进行系统采样分析。结果表明,巴丹吉林沙漠典型高大沙山(1 605 m)粒度组成中细砂含量最高,中砂次之;粗砂、极细砂和粗粉砂含量均较少,胶粒、粘粒、细粉砂未出现。迎风坡沉积物粒度比背风坡细。迎风坡砂粒大小均匀、分选好,迎风坡沉积物颗粒较背风坡总体要均匀。沙山迎风坡和背风坡沉积物由坡脚至顶部粒径总体变细,砂粒大小趋于均匀,分选变好,偏度和峰态由波动趋于稳定。大沙山迎风坡下部侵蚀作用为主,背风坡中上部以风力堆积为主,下部以重力堆积为主。
The paper selected the typical mega-dune (1605 m) in Badain Jaran Desert as the object of the study, and analyzed the sediment samples systematically. The results showed that the content of the fine sand was the highest, followed by the medium sand. The contents of the coarse sand, very fine sand and coarse silt were less, and the colloidal particle, clay and fine silt didn’t appear. The particle size of sediment on windward slope was smaller than that on leeward slope. The sand particle on windward slope was even-sized, well-separated. The sediment particle size became smaller, evener, better-separated, and the deviation and kurtosis more stable from the bottom to the top of the slope. The main function was erosion on bottom of windward slope, and the main function was accretion by wind action in middle and upper part and by gravity in bottom of leeward slope.
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