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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Relations between morphology, air flow, sand flux and particle size on transverse dunes, Taklimakan Sand Sea, China
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Relations between morphology, air flow, sand flux and particle size on transverse dunes, Taklimakan Sand Sea, China

机译：塔克拉玛干沙海横向沙丘的形态，空气流量，沙通量和粒径之间的关系

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摘要

Field experiments on two isolated transverse dunes with different scales in the Taklimakan Sand Sea show that particle size and slope control the threshold shear velocity and sand flows on the stoss of the dunes. The decreased threshold shear velocity and the unsaturated sand flows are the main reasons why sands are not deposited at the toe of the dunes. The particle size controls sand flux through its influence on the aerodynamic roughness elements and threshold shear velocities. The sand flux is different for dune surfaces with different particle size distributions. Under the control of the medium to low stress of the drifting-sand winds, the results of the field experiments and particle size analysis showed that sand transport had little influence on the particle size distributions. The mean particle size being transported on the stoss is lower than that on the dune surface. It is difficult to determine whether or not the wind is fully saturated with sands when sand flux calculation is mainly dependent on the shear velocity and the mean particle size. The sands within some range of the particle size are transported and developed into simple transverse dunes, and then the interdune surface is coarsened and alternated with the draas in the Taklimakan Sand Sea.
机译：在塔克拉玛干沙海中两个不同尺度的孤立横向沙丘的野外试验表明，颗粒大小和坡度控制着阈值剪切速度，沙丘上的沙粒流向。阈值剪切速度的降低和不饱和砂流是砂子未沉积在沙丘脚趾的主要原因。颗粒大小通过其对空气动力学粗糙度元素和阈值剪切速度的影响来控制砂通量。对于具有不同粒径分布的沙丘表面，砂通量是不同的。在流沙风的中低应力控制下，野外试验和粒度分析结果表明，输沙对粒度分布的影响很小。在苔藓上运输的平均粒度比在沙丘表面上的平均粒度低。当砂通量的计算主要取决于剪切速度和平均粒径时，很难确定风是否被砂完全饱和。在一定粒径范围内的沙子被运输并发展成简单的横向沙丘，然后在塔克拉玛干沙海中使中间表面变粗糙并与褶皱交替。

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