野外沙粒运动的高速频闪摄影研究

AN EXPERIMENT ON SAND-PARTICAL MOVEMENT UNDER DESERT CONDITION BY USING HIGH SPEED STROBSCOPE

研究自然界中沙粒运动的微观状态,是防沙害工程中的一项基本课题。本文介绍了用高速频闪摄影在野外风沙流条件下,对沙粒运动的动态特性进行的摄影研究。 文中介绍了我们为适应野外条件而设计的专用实验装置及其实验方祛。从工程研究的角度出发,用统计方法对挑选出的172颗轨迹较为清晰完整的沙粒进行了分析,并将统计结果同室内风洞条件下的实验数据,以及常规的野外宏观测量结果作了比较。结果表明,这三项测量得到的有关沙粒运动的统计规律是一致的。

The study of the micro-characteristics of sand particle movement in desert, is one of the basic research programs in desert protection engineering.This paper presents an experiment on sand particle movement under desert conditions by using high speen strobscope. We developed a special set of devices and experimental methods specially suitable to the desert conditions. From the engineering point of view, by using statistics approaches. We made an analysis of 172 selected sand particle whose traces could be clearly recognized, and the analytical results coincide well with the experimental data obtained in the wind tunnel and with that of macro-measurement under normal conditions in desert.