库布齐沙漠不同地表类型沙粒粒径分析

Analysis on Particle Size of Different Land Surface Types in Kubuqi Desert

通过对库布齐沙漠夜鸣沙沙物质、库布齐沙漠穿沙公路两侧沙障内沙物质、银肯响沙的沙物质、响沙湾附近新月形沙丘沙物质以及响沙湾附近固定沙丘沙物质各粒级颗粒的百分含量进行对比分析研究,得出以下结论:(1)夜鸣沙的的粒径均一,分选良好,其中细沙占95.72%,这是夜明沙在夜晚自鸣的主要原因;(2)银肯响沙的细沙占89.54%,比夜鸣沙细沙含量低6.18个百分点,但银肯响沙所处区域已同时满足"共鸣箱"理论和"筛匀汰净"理论成立的条件,也易形成响沙;(3)穿沙公路两侧沙障内的沙样细沙占86.45%,极细沙占11.34%,中沙占1.61%;(4)固定沙丘沙粒径范围较广,粗沙、中沙、细沙、极细沙以及粉沙均有分布;(5)新月形沙丘中粗沙占0.47%,中沙占14.81%,细沙占81.49%,极细沙占3.02%。

Through contrasting, analyzing the content of particle size of night sounding sands, sounding sands and sands in Kubuqi Desert, the results show ： （ 1 ） The particle size of night sounding sands is even, with fine sands taking up 95.72 percent, which is the main factor for night sounding sands to sound by themselves in night. （2） The fine sands in Yinken sounding sands take up 89.54 percent, with 6. 18 percentage points lower than the one in night sounding sands. At the meantime, because the environment where Yinken sounding sands stay meet the con- ditions of the theory of resonance box and sieve net, the sounding sands can be formed easily. （3） In sand sample of sand barriers along the desert - crossing highway, fine sand takes up 86. 45 percent, very fine sand takes up 11.34 percent, middle sand takes up 1.61 percent. （4） In fixed dune distribute coarse sand, middle sand, fine sand, very fine sand and silt sand. （5） In barchane, coarse sand takes up 0. 47 percent, middle sand takes up 14. 81 percent, fine sand takes up 81.49 percent, very fine sand takes up 3.02 percent.