复式河槽动量输运系数研究

复式河槽动量输运系数在计算复式河槽过流能力、滩槽交界面平均表观剪切应力和滩槽床面平均剪切应力等方面有着十分重要的作用。本文首先根据刘沛清和Knight滩槽交界面垂向平均表观剪切应力关系式，导出复式河槽动量输运系数的表达式；接着运用英国科学工程研究协会洪水水槽设施(SERC—FCF)的大量的系列水槽实验成果，分析了动量输运系数随相对水深及滩槽宽度比的变化关系；最后根据获得的动量输运系数关系，利用刘沛清方法计算复式河槽过流能力。计算结果表明：本文中的动量输运系数随相对水深及滩槽宽度比的变化关系是可行的。

Research on momentum transfer coefficient in compound channels

Momentum transfer coefficient plays an important role in computing conveyance capacity, mean apparent shear stress on the vertical interface between main channel and flood plain, mean boundary shear stress on flood plains or in main channel respectively. In this paper, based on Liu Peiqing's and Knight's expressions of vertical mean apparent shear stress, the expression of momentum transfer coefficient is derived; applying experimental data from Science and Engineering Research Council Flood Channel Facility (SERC-FCF), the variation of momentum transfer coefficient with relative depth and the ratio of flood plain and main channel width, is analyzed; based on the momentum transfer coefficient relationship obtained and applying Liu Peiqing's method, the conveyance capacity in compound channel is calculated. The computed results show the momentum transfer coefficient relationship obtained is viable.