Measuring the kinetic parameters of saltating sand grains using a high-speed digital camera  

作　　者：ZHANG Yang WANG Yuan JIA Pan 

机构地区：[1]Department of Fluid Machinery and Engineering,Xi'an Jiaotong University

出　　处：《Science China(Physics,Mechanics & Astronomy)》2014年第6期1137-1143,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11272252)

摘　　要：A high-speed digital camera is used to record the saltation of three sand samples(diameter range:300–500,200–300 and100–125μm).This is followed by an overlapping particle tracking algorithm to reconstruct the saltating trajectory and the differential scheme to abstract the kinetic parameters of saltating grains.The velocity results confirm the propagating feature of saltation in maintaining near-face aeolian sand transport.Moreover,the acceleration of saltating sand grains was obtained directly from the reconstructed trajectory,and the results reveal that the climbing stage of the saltating trajectory represents an critical process of energy transfer while the sand grains travel through air.A high-speed digital camera is used to record the saltation of three sand samples （diameter range： 300-500, 200-300 and 100-125 μm）. This is followed by an overlapping particle tracking algorithm to reconstruct the saltating trajectory and the dif- ferential scheme to abstract the kinetic parameters of saltating grains. The velocity results confirm the propagating feature of saltation in maintaining near-face aeolian sand transport. Moreover, the acceleration of saltating sand grains was obtained di- rectly from the reconstructed trajectory, and the results reveal that the climbing stage of the saltating trajectory represents an critical process of energy transfer while the sand grains travel through air.

关 键 词：high-speed digital camera sand saltation particle tracking kinetic parameters 

分 类 号：P931.3[天文地球—自然地理学] O35[理学—流体力学]