摘要
冬季河流封冻后,水体表面出现固体冰盖,使得过水断面的湿周增大,水力半径减小,从而导致了水流结构和紊动水体对河底附加切应力的改变。进行冰盖下水流纵向紊动特性试验研究对进一步探讨冰盖下的紊流冲刷具有一定的指导意义。本文借助室内模拟试验,对不同流速、水深、冰盖糙率等条件下的冰盖下水流垂线流速及紊动强度进行了观测与分析,得出了以下结论:在水流条件基本一致的情况下,冰盖下水流纵向紊动强度比明流大;且随冰盖糙率的增大,冰盖下水流的纵向紊动强度逐渐增大。
When river water was frozen in the winter, the ice cover appears on the water surface, which increases wetted perimeter of the flow cross section and decreases hydraulic radius. That will result in the change of flow structure and change of additional shear stress of bottom structure in turbulent wa- ter. The research result will lay a foundation for further research the local influence caused by turbu lence flow to structures under ice sheets effect. Based on the simulation test in laboratory, the vertical velocity and turbulence intensity of ice sheets with different flow velocity, depth, roughness etc are ana lyzed. The research results show that the turbulent free flow under the basically same conditiom and it intensity of ice-sheet flow was greater than that of increases with the ice-sheet roughness increasing.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2015年第5期101-106,共6页
Periodical of Ocean University of China
基金
国家自然科学基金项目(51279189)资助
关键词
冰盖作用
流速分布
紊动强度分布
试验研究
ice sheets effect
flow velocity distribution
turbulence intensity distribution
experimen-tal research
