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毛乌素沙地南缘横向沙丘粒度分布及其对风向变化的响应

DOI: 10.11820/dlkxjz.2006.06.005, PP. 42-51

Keywords: 风向,横向沙丘,粒径及分选,毛乌素沙地,形态

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Abstract:

在风季发生转换期间,根据不同方向风的持续时间,对毛乌素沙地南缘长48m,高8m的横向沙丘进行了7次断面形态测量和表面沉积物采样分析。结果表明,横向沙丘断面形态及表面沉积物粒度分布随区域气流方向和强度而发生变化。在沙丘各部位,丘顶及附近两侧的沙粒活动性强,表面沉积物粒径及分选参数变化显著。在粒径及分选参数中,粒径频率曲线、平均粒径和偏度对风的作用比较敏感,随时间的变化也明显,利用它们的变化可以解释区域气流变化对沙丘的影响。风向发生转换时期的短期观测和采样分析结果进一步说明采样时间是影响沙丘表面沉积物粒度特征的重要因素。

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