南疆铁路吐鱼段风沙活动规律研究

通过对南疆铁路吐鱼段戈壁大风区风沙流进行现场观测研究,得出该地区大风显现明显的季节性变化,每年的春季是大风高发季节,年平均大风日数高达136d。大风携沙量的垂直分布十分明显,集沙量与高度显现e的负指数变化,高度越高集沙量越小;2m以下区域是风沙灾害防护的重点区域,其大风携沙量占总携沙量的96%左右。沙粒颗分试验结果表明,戈壁风沙运动存在较明显的分层现象,沙粒粒径以0.1~0.25mm为主。

Study on Wind-blown Sand Activity Characteristic at Turpan-Yuergou Section of Southern Xinjing Railway

This paper observed and researched the characteristic of wind-blown sand activity in Gobi strong wind zone along the Southern Xinjiang Railway. The observation and research results show that:( a) There is obvious seasonal variation characteristic of strong wind in this zone,and each spring is the peak season of strong wind; the annual average number of the days with strong wind reaches up to 136d.( b) The sand quantity carried by strong wind presents an obvious vertical distribution trend; there is a negative exponential correlation between sand quantity and wind height,and the higher the wind height rises,the smaller the sand quantity will be; the height range less than 2m is the key range where should be especially protected against sand hazard,because within this range,the sand quantity carried by strong wind accounts for about 96 percent of the total sand quantity carried by strong wind.( c) Sand size grading experiment shows: there is obvious stratification phenomenon in the wind-blown sand movement in Gobi,and 0. 1 to 0. 25mm grain sizes are the main grain sizes.