Evolution of downsized crescent-shaped dune in wind tunnel experiment

作     者：ZHANG Yang WANG Yuan JIA Pan 

作者机构：Department of Fluid Machinery and Engineering Xi’an Jiaotong University 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2014年第57卷第1期

页      面：143-151页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11272252 and 11102153) 

主　　题：crescent-shaped dune wind tunnel experiment saturation level of sand flux digital image processing dune evolution 

摘      要：The migration of a downsized crescent-shaped dune was investigated in a wind tunnel *** upwind influx and vertical oscillation of the sand bed were introduced to modulate the saturation level of the sand flux above the dune surface to affect dune *** evolution was recorded by top-view photography and then abstracted as the evolution of self-defined characteristic quantities using a digital image processing *** results showed that,in contrast to the case for spanwise quantities,the evolution of streamwise quantities corresponds to a linear increase in the modulation magnitude more positively and in a monotonic and convergent *** contrast with quantities on the windward face,the changes in quantities with respect to the horns were nonmonotonic with time and almost uncorrelated with the variation in modulation strength,which reveals the distinctiveness of leeside evolution.