摘要
本文根据絮凝电化学理论,探讨了淤积物浓度对粘性泥沙起动切应力的影响,获得起动切应力τc与淤积物浓度S的相关式τ_o=KS^(2·33) 该公式得到众多试验资料的证实。冲刷试验表明,具有均匀容重的底床在不同水流切力下,冲刷率随时间基本成直线变化,自养密实底床的冲刷率随时间呈指数曲线变化。试验结果还表明均匀容重底床的冲刷率与水流流速近似成四次方关系,论文运用了窦国仁博士从能量原理获得的床面泥沙动密实系数概念,获得冲刷率的表达式为 E=(K_0)/(C_0~2)-(γsγ)/(γs-γ)(V-V_c)
This paper, based upon modern electrochemical theory about flocculation, deals with the influence of silt deposits' concentration on the initiating shear stress of cohesive material, and the correlation expression between the initiating shear stress τ_c and the concentration of silt deposits Sis τ_o=KS^(2.33) The experiment indicaes that, for a uniform bulk density bed under an action of different shear stress of flow current,the erosion rate has a linear variation in the main, with time. While For a stratified bed the erosion rate appears as an exponential function variation with time. The experiment also indicates that the erosion rate of the uniform bulk dcnsity bed has a fourth power relation approximately to the flow velocity. By the application of Dou Guoren's energy principle about the conception on the compacting factor of sediment movement on bottom bed, we obtain the expresion of the erosion rate E=(K_0)/(C_0~2) (γsγ)/(γs-γ)×(V-V_c)V^3/gωd.These two expressions above-mentioned have been confirmed by a large number of experimental data.
出处
《海洋工程》
CSCD
北大核心
1989年第1期61-70,共10页
The Ocean Engineering
