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首页> 外文期刊>Chinese science bulletin >Structural variations of sand-bearing airflow over dune at southeastern fringe of Tengger Desert
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Structural variations of sand-bearing airflow over dune at southeastern fringe of Tengger Desert

机译：腾格里沙漠东南缘沙丘上含沙气流的结构变化

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摘要

From the analytical results of observed data on sand transport rates at different positions of dune surface at southeastern fringe of Tengger Desert, it has been found that the vertical distribution of blown sand flux exhibits a noticeable variation when sand grains move upslope and downslope of dune surface under the action of wind force. Within the height of 20 cm above the sand surface, the vertical distribution of mass flux at different positions from toe to dune crest of stoss slope of sand dunes coincides with a single exponentially decaying law; while the vertical distribution of mass flux over the lee slope occurs as tow variable zones, with the height of 8-12 cm as the dividing line, the sand transport rate below this height exponentially decreases with increasing height, but above this height decreases in a power function law. On the stoss slope, the relative sand transport rate in the upper layer of sand flow tends to decrease with the increasing wind velocity and the total sand transport rate towards the dune crest due to the shortened trajectory length of saltation sand grains moving upslope. On the lee slope, the increase in lift-off height and trajectory length of saltation sand grains moving downslope leads to the increase in relative sand transport rate in the upper layer of sand flow.
机译：通过对腾格里沙漠东南缘沙丘表面不同位置的输沙速率观测数据的分析结果，发现当沙粒沿沙丘表面上坡和下坡移动时，吹砂通量的垂直分布表现出明显的变化。在风力的作用下。在沙面以上20 cm的高度内，沙丘从土坡的脚趾到沙丘顶的不同位置的质量通量的垂直分布与单一的指数衰减规律相吻合。而在下坡坡面上的质量通量的垂直分布是作为两个可变区出现的，以8-12 cm的高度作为分界线，低于该高度的砂子输送速率随高度的增加而呈指数下降，但高于该高度的砂子输送速度则随着高度的增加而减小。幂函数定律。在风沙坡上，由于盐分沙粒向高处移动的轨迹长度缩短，随着风速的增加和沙丘顶的总沙流速率的增加，沙流上层的相对沙流速率趋于降低。在背风坡上，盐分下沉的沙粒的抬高高度和轨迹长度的增加导致砂流上层的相对输沙速率增加。

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