Airflow up the stoss slope of sand dunes: Limitations of current understanding
Airflow up the stoss slope of sand dunes: Limitations of current understanding
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DOI：
10.1016/0169-555x(95)00094-l
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发表时间：
1996-09-01
期刊：
影响因子：
3.9
通讯作者：
Kocurek, G
中科院分区：
文献类型：
--
作者：
Frank, AJ;Kocurek, G
沙丘的迎风面在风的路径中充当流线型障碍物。连续性原理要求沿沙丘陡坡向上的流场压缩，并且剪切应力必须随着流动的加速而逐渐增加。在得克萨斯州帕德雷岛、加州的阿尔戈多内斯和新墨西哥州的白色沙滩的13个沙丘上进行的横向流动测量证实，在斯托斯斜坡上的速度剖面不是对数线性的，并且流动加速发生在非常接近表面的内部边界层内。因此，在上覆流中，在历史上进行了测量，剪切应力的整体下降发生在斜坡上。速度剖面的实际形状，以及从中推导出驱动跃移的剪切应力的剖面的适当部分的识别，代表了传统手段无法解决的主要问题。
The windward (stoss) side of a sand dune acts as a streamlined obstacle in the path of the wind. Continuity principles necessitate compression of the flow field up the stoss slope of a dune, and shear stress must progressively increase as the flow accelerates. Measurements in transverse flow over thirteen dunes at Padre Island, Texas, the Algodones, California, and White Sands, New Mexico, confirm that velocity profiles on the stoss slope are not log-linear, and that flow acceleration occurs very close to the surface within an internal boundary layer. As a consequence, in the overlying flow where measurements have historically been made, an overall decrease in shear stress occurs up the slope. The actual shape of the velocity profiles, and the identification of the appropriate segment of the profile from which to derive the shear stress that drives saltation represent major problems not approachable by traditional means.