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中国沙漠  2014 

艾比湖流域抛物线沙丘表层沉积物粒度特征

DOI: 10.7522/j.issn.1000-694X.2013.00368

Keywords: 抛物线沙丘,粒度,艾比湖流域

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Abstract:

对艾比湖流域抛物线沙丘表层沉积物样品的实验分析结果表明:沙丘表层沉积物粒径分布在0.4~2116.5μm。沙丘表层沉积物主要成分为沙,且含有一定量的细砾和黏土成分;平均粒径从两翼间地至丘顶逐渐变粗,丘顶至背风坡脚逐渐变细;沉积物分选性整体较差,平均粒径愈小,分选性愈好;粒径频率曲线为正偏、基本对称、负偏和极负偏混合存在。沙丘表层沉积物的平均粒径与分选系数存在不显著的负相关性,与峰态呈现显著负相关,分选系数与峰态呈现显著正相关性。沙丘不同地貌部位沉积物的粒级、平均粒径、分选系数呈现出有规律的变化,系风沙流、沙丘形态、植被和沉积物综合作用的结果。艾比湖流流域内抛物线沙丘的物质来源为两个或两个以上的沉积物混合形成的多源供应物。

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