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barchan n.新月形沙丘。

barclay

Second , according to field investigation and wind - tunnel experiment , some scholar s advanced that barchan dunes often appear in dynamic equilibrium shapes when th ey move along the direction perpendi cular to the dune ridge under the influence of unimodle sand - moving wind 風成沙的紅化和圓度特征不宜作為判別其氣候意義的診斷性標志,應當結合動植物化石及石英砂顯微結構等線索來確定。