文章摘要
齐梅兰,石粕辰.局部冲刷坑发展过程的泥沙输运特性[J].水利学报,2018,49(12):1471-1480
局部冲刷坑发展过程的泥沙输运特性
Study on the mechanism of water-sediment interaction in the scouring process around a pile
投稿时间:2018-06-03  
DOI:10.13243/j.cnki.slxb.20180519
中文关键词: 局部冲刷  床面切应力  马蹄涡流  泥沙输运  悬移质  推移质
英文关键词: local scouring  bed shear stress  horseshoe vortex  sediment transport  suspended load  bed load
基金项目:国家自然科学基金项目(51578062);中国铁路总公司科技研究开发计划项目(2014G009-H)
作者单位
齐梅兰 北京交通大学 土木建筑工程学院, 北京 100044
北京交通大学 结构风工程与城市风环境北京市重点实验室, 北京 100044 
石粕辰 北京交通大学 土木建筑工程学院, 北京 100044 
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中文摘要:
      为揭示水流作用下沙质河床结构物周围床面冲刷过程中的泥沙输运特性,采用三维紊流、考虑推移质和悬移质运动的河床变形数值模拟,研究了清水冲刷和动床冲刷条件下,墩柱型结构物局部冲刷过程中悬移质和推移质泥沙输运贡献及其与马蹄涡流特征量、床面切应力以及泥沙悬浮指数的相关性。研究发现,清水冲刷条件下,悬移质输运占比较小,推移质泥沙输运占优;动床冲刷条件下,悬移质输运的贡献随悬浮指数的减小迅速增大;冲刷过程中悬移质和推移质输沙率与床面切应力变化趋势一致,结构物周围局部切应力的大小与马蹄涡涡量呈正相关关系。
英文摘要:
      Aimed at exploration of the sediment transport behavior in local scouring process around a struc-ture,3D turbulent flow equations coupled with bedload and suspended load transport,as well as bed defor-mation were used to numerically simulate the local scour and investigate the contribution of the two kinds of sediment transportation, horse-shoe vortex, and the correlation of suspended load with the sediment sus-pension index under clear water and livebed conditions. It was found that under the clear water scour condi-tion, the transport of suspended load contributes a relatively small proportion, and the scouring process is dominated by bed load transport which contributes approximately up 95 percent. Under the live bed scour condition, suspended load transport increases rapidly with the decrease of the particle suspension index. In the scouring process, the variation of sediment transport rate for suspended load and bed load is consistent with the trend of the local shear stress around the structure. Further, the variation of the bed shear stress is positively controlled by the horseshoe vortex.
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