实验流体力学2011，Vol.25Issue(2)：96-100,5.
沙粒蠕移运动速度测量及其统计分析
Statistical study on the velocity of aeolian creeping sands using high-speed digital photography
摘要
Abstract
High-speed digital photography was adopted to record sand creep motion in atmospheric boundary layer wind tunnel. Non-negative subtraction algorithm, dynamical threshold algorithm and bidirectional particle tracking algorithm were applied successively to abstract adequate and valid creep trajectories from image sequence. Then, velocity magnitude and lift-off velocity of creep sands were statistically analyzed. The results indicated that creep motion initiated by flow and that initiated by collision respectively stood for steadily and dynamically varying parts of whole creep motion; as friction velocity increases, proportions of two parts would go in opposite way and the dominance would eventually turn to latter part once the friction velocity exceeds critical value.关键词
高速光学测量/蠕移运动/轨迹提取/起动方式Key words
high-speed digital photography/ sand creep motion/trajectory abstraction / initiation type分类
数理科学引用本文复制引用
张洋,王元,王丽..沙粒蠕移运动速度测量及其统计分析[J].实验流体力学,2011,25(2):96-100,5.基金项目
基国家自然科学基金(10972176),新疆维吾尔自治区"十五"科技攻关重大项目(200833121) （10972176）
