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CHEN Xin,ZHANG Zichao,WANG Fujun. 2018. A numerical study for boundary layer current and sheet flow transport induced by a skewed asymmetric wave. Acta Oceanologica Sinica, 37(9):82-89
A numerical study for boundary layer current and sheet flow transport induced by a skewed asymmetric wave
非对称歪斜波引起的片流输沙数值研究
Received:November 12, 2017  
DOI:10.1007/s13131-018-1267-4
Key words:analytical model  boundary layer current  sediment transport  sheet flow  skewed asymmetric wave
中文关键词:  理论模型  边界层流动  泥沙输运  片流  非对称歪斜波
基金项目:The National Natural Science Foundation of China under contract Nos 51609244 and 51779258.
Author NameAffiliationE-mail
CHEN Xin Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, China Agricultural University, Beijing 100083, China chenx@cau.edu.cn 
ZHANG Zichao School of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou 450045, China  
WANG Fujun Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, China Agricultural University, Beijing 100083, China  
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Abstract:
      An analytical model with essential parameters given by a two-phase numerical model is utilized to study the net boundary layer current and sediment transport under skewed asymmetric oscillatory sheet flows. The analytical model is the first instantaneous type model that can consider phase-lag and asymmetric boundary layer development. The two-phase model supplies the essential phase-lead, instantaneous erosion depth and boundary layer development for the analytical model to enhance the understanding of velocity skewness and acceleration skewness in sediment flux and transport rate. The sediment transport difference between onshore and offshore stages caused by velocity skewness or acceleration skewness is shown to illustrate the determination of net sediment transport by the analytical model. In previous studies about sediment transport in skewed asymmetric sheet flows, the generation of net sediment transport is mainly concluded to the phase-lag effect. However, the phase-lag effect is shown important but not enough for the net sediment transport, while the skewed asymmetric boundary layer development generated net boundary layer current and mobile bed effect are key important in the transport process.
中文摘要:
      本文用了一个可考虑相位差作用和波浪边界层非对称性的瞬态理论模型和一个两相紊流模型共同研究非对称歪斜波引起的片流输沙现象。为了解速度偏度和加速度偏度对输沙通量和输沙率的贡献,两相流模型为理论模型提供了必要的相位超前、瞬时侵蚀深度和边界层的发展过程。理论模型研究显示了由速度偏度和加速度偏度引起的向岸阶段和离岸阶段的泥沙运动非对称性,解释了净输沙的产生原因。在以往的非对称歪斜波片流输沙研究中,净输沙的产生主要被归结于相位差作用。本文的研究则表明了非对称的边界层发展所产生的净流量和动床面效应在净输沙产生过程中的比相位差作用更为重要。
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