Journal of Yangtze River Scientific Research Institute ›› 2022, Vol. 39 ›› Issue (9): 77-83.DOI: 10.11988/ckyyb.20210617

• HYDRAULICS • Previous Articles     Next Articles

Preliminary Research on Characteristics of Very-large-scale Turbulence Motions in Decelerating Open Channel Flow

ZHANG Peng1, DUAN Yan-chong2, WANG Yong-qiang3, HU Jiang4, YANG Sheng-fa1, LI Wen-jie1   

  1. 1. National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, China;
    2. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;
    3. School of River & Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074, China;
    4. Key Laboratory of Ministry of Education for Hydraulic and Water Transport Engineering, Chongqing Jiaotong University, Chongqing 400074, China
  • Received:2021-06-21 Revised:2021-11-03 Online:2022-09-01 Published:2022-09-21

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Abstract: This study experimentally examined the very-large-scale motions (VLSMs) characteristics in decelerating open-channel flow based on acoustic Doppler current profiler (ADCP) and acoustic Doppler velocimeter (ADV) measurements. Meanwhile, the turbulence intensity, VLSMs’ wavelength and turbulent kinetic energy ratio were analyzed. Statistical evidence of the presence of VLSMs in decelerating open channel flow was presented. Moreover, its streamwise scale increased first and then decreased along with the water depth. The VLSMs still exist in the water surface area of the decelerating open channel flow and occupy about 46% of the turbulent kinetic energy.

Key words: decelerating flow, very-large-scale motions, coherent structure, power spectra, turbulent kinetic energy

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