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地理科学  2012 

新月形沙丘表面100cm高度内风沙流输沙量垂直分布函数分段拟合

, PP. 892-897

Keywords: 塔克拉玛干沙漠,新月形沙丘,输沙量垂直分布,分段拟合函数

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Abstract:

为研究新月形沙丘表面不同层位风沙流输沙量的垂直分布函数,实测了塔克拉玛干沙漠腹地典型新月形沙丘表面100cm高度内(以1cm分隔)的输沙量。分段拟合分析表明新月形沙丘迎风坡脚输沙量垂直分布规律不完全服从指数函数,出现与戈壁风沙流结构特征相似的“象鼻效应”,在0~3cm区间内输沙量逐渐增大,3cm以上输沙量随高度呈指数函数衰减；沙丘顶部0~10cm区间输沙量随高度呈指数函数衰减,10cm以上呈二次函数衰减；沙丘左翼端输沙量随高度呈幂函数分布,沙丘右翼端0~20cm内以指数函数衰减,20cm以上呈三次函数衰减；沙丘背风坡脚风沙流输沙量在0~60cm和60cm以上分别呈不同形式的三次函数分布。

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