摘要
平面射流冲刷是局部冲刷的典型案例,由于冲刷初期水沙相互作用剧烈、床面形态变化迅速等原因,相关研究在文献中鲜有报道。利用图像处理技术详细观测了平面射流冲刷坑的形态演变和流场变化特性。分析结果表明:冲刷坑的发展过程因输沙特性的不同可划分为两个阶段,即初始阶段的“剪切冲刷”和充分发展阶段的“涡体冲刷”。针对剪切冲刷,应用推移质输沙模型,分析了其输沙规律。研究结果得到了试验数据的验证。
Local scour induced by plane jet occurs in engineering applications,of which the evolution process is one of attractive topics in the field of sediment transport.The scour is characterized by intense flow-sediment interactions and rapid variations in the bed morphology.This study applied an image-based technique to capture the detail of scour processes and related variations in the flow field.The results show that the processes of scour hole can be divided into two typical stages,as"shear scour"in the initial stage and"vortex scour"in the subsequent developing stage,which are associated with different mechanisms of sediment transport.The bedload model for sheet flows is then applied to analyze the sediment transport related to the"shear scour",of which the results are validated by the experimental data.
作者
罗爱泽
程年生
卢叶盛
魏茂兴
LUO Ai-ze;CHENG Nian-sheng;LU Ye-sheng;WEI Mao-xing(Ocean College,Zhejiang University,Zhoushan 316021,China;The Engineering Research Center of Oceanic Sensing Technology and Equipment,Ministry of Education,Zhoushan 316021,China)
出处
《泥沙研究》
CAS
CSCD
北大核心
2023年第4期17-23,31,共8页
Journal of Sediment Research
基金
国家自然科学基金项目(51979242)。
关键词
剪切冲刷
涡体冲刷
平面射流
局部冲刷
输沙率
shear scour
vortex scour
plane jet
local scour
sediment transport rate
