中文摘要：

在风沙防治中,根据气流与沙物质地表作用的机理来看,主要有三种途径。一是降低床面风速,二是减少沙源,第三就是阻截运动气流与床面的相互作用。借助风洞模拟实验,对覆网床面风沙流特性研究发现：覆网床面沙面稳定性主要受覆网形状参数的影响,通过对覆网床面风速廓线、风沙流结构观测,主要探讨孔隙度、孔径等覆网参数对沙面稳定性的影响机理。另外,覆网床面蚀积状态还受进口风速的影响,在风速较小时,床面表现为积沙,风速较大时,床面开始风蚀。

英文摘要：

Three methods are mainly used to control wind - blown sand hazard, on the basis of the understanding of the mechanisms of air flow and sandy .bed. One is to impair wind speed near earth surface, the second is to reduce sand source and the third is to block the relationship between air flow and sand grains. This research aims to illustrate the characteristics of wind - blown sand on net - covered bed. The stability of sand surface under net -covered protection is mainly determined by shape parameters of net. Based on the observation of wind velocity profile and the structure of wind - blown sand, the mechanism of the porosity, diameter and other parameters of netcovered materials on the stability of sand surface have been investigated. In addition, the erosion -accu- mulated state of wind - blown sand under net - covered bed also relies on inlet wind velocity. Under small wind velocity, the sand flow on net -covered sandy bed mainly accumulates, while under great wind velocity, the sand bed begins to wind erosion.