巴丹吉林沙漠风沙流输沙沙粒形貌特征分析;

为了解风沙流输沙沙粒微观形貌特征，本文利用NIKONSMZ1500体视显微镜和DT2000图像分析软件对巴丹吉林沙漠拐子湖沙尘暴天气过程中所采集的梯度沙样粒形进行分析，结果显示粒径大于0.3mm的沙粒表面磨蚀作用明显，尤其是透明度差的沙粒磨蚀更为显著，沙粒圆度值分布在0.8-1.0之间，沙粒圆度集中0.8-0.9之间，磨圆较好，表面光滑。粒径在0.15-0.3mm之间的沙粒的表面磨蚀作用相对较弱，棱角明显增多，沙粒形状渐趋复杂。圆度值仍然分布于0.8-1.0之间，不过集中在0.8-0.9之间，粒径在0.074-0.15mm间的沙粒表面磨蚀作用更弱，棱角更多、更明显，沙粒圆度值分布在0.6-1.0之间，跨度变大，说明沙粒的形状更多样化，以50厘米高度上所取沙样最明显。沙粒圆度、磨圆度的研究及分析对本区沙尘源的确定具有一定的参考意义。

The characteristics analysis of sand from the wind-sand flow in BaDanJiLin Desert

In order to understand the shape features of sand from sand-wind flow, This paper use NIKONSMZ1500 and DT2000 image analysis software to analyse the shape of sand from the sand storm in Guaizi lake BaDanJiLin desert , and the results indicate that sand, whose diameter is larger than 0.3mm, especially which transparency is poor, is obviously erosion in their surface. The value of the sand roundness is between 0.8mm and 1.0mm, although the value is concentrated between 0.8mm and 0.9mm. This sand is well in round and owns smooth surface. On the contrary, the sand, whose diameter is between 0.15mm and 0.3 mm, is weakly in abrasive action . Its surface edges and corners are increased obviously, and the sand shape is becoming complicated. The roundness value distributes between 0.8 and 1.0,but contributes between 0.8 and 0.9.The sand whose diameter is between 0.074 mm and 0.15mm, is weaker in abrasive action,its surface edges are increased and more obviously. The sand roundness value distributes between 0.6 and 1.0, the span is increased ,that illustrate the sand shape is more diversified,the sand is most obviously from 50cm hight.The sand grinding of roundness, roundness research and analysis are the certain reference significance for determining the source of this dust .