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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Diurnal patterns of blowing sand
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Diurnal patterns of blowing sand

机译：沙粒的日变化

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摘要

The diurnal pattern of blowing sand results from a complex process that involves an interaction between solar heating, thermal instability, atmospheric turbulence, wind strength, and surface threshold conditions. During the day, solar heating produces thermal instability, which enhances the convective mixing of high momentum winds from the upper levels of the atmosphere to the surface layer. The sun also dries the sand surface so that the critical threshold is as low as possible. Thus, in the afternoon, the combination of strong turbulent winds and a low surface threshold increases the likelihood that winds may intermittently exceed the critical threshold of the surface to produce bursts of blowing sand. Here an attempt has been made to explore this dynamic aeolian process using a new method for monitoring the diurnal pattern of blowing sand. This technique involves detecting blowing sand with a piezoelectric saltation sensor to determine the relative proportion of time that blowing sand is detected for a given 'time of day'. Measurements taken over a seven-month period on the high plains of the Llano Estacado of West Texas and eastern New Mexico suggest that sand movement tends to occur more frequently during daylight hours with a peak in aeolian activity occurring in the afternoon between 14:00 and 15:00 Local Standard Time (LST). Published in 2010 by John Wiley & Sons, Ltd.
机译：吹沙的昼夜模式是由一个复杂的过程导致的，该过程涉及太阳加热，热不稳定性，大气湍流，风强度和表面阈值条件之间的相互作用。白天，太阳能加热会产生热不稳定，从而增强了从大气高层到表层的高动量风的对流混合。太阳还会使沙粒表面干燥，因此临界阈值应尽可能低。因此，在下午，强湍流风和低表面阈值的组合增加了风间歇性地超过表面的临界阈值以产生沙尘暴的可能性。在此尝试使用一种新方法来监测这种动态的风沙过程，以监测吹沙的昼夜模式。该技术涉及用压电式盐分传感器检测吹沙，以确定在给定的“一天中的时间”内检测到吹沙的时间的相对比例。在西得克萨斯州的Llano Estacado和新墨西哥州东部的高平原上进行的为期七个月的测量表明，沙粒移动往往在白天时段发生，风沙活动的高峰发生在下午14:00至14:00之间。 15:00当地标准时间（LST）。 John Wiley＆Sons，Ltd.在2010年出版。

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