【摘要】 采用理论推导和数值计算的方法,进一步研究了不平衡输沙条件下的含沙量垂线分布,首次提出了非饱和泥沙通量的概念及其表达式,推导了不平衡输沙含沙量垂线分布的理论解,包括不平衡输沙含沙量垂线分布指数公式和幂函数公式,以及相应的底部含沙量确定方法。同时利用差分法求解剖面二维扩散方程,得到了不同参数的不平衡输沙含沙量垂线分布。其结果除少数误差稍大外,两种途径得出的含沙量垂线分布彼此符合良好。更多还原

【Abstract】 The vertical distribution of suspended load concentration is one of the key theoretical components in sediment research. The vertical distribution of sediment concentration in non-equilibrium transportation is further studied using methods of theoretical derivation and numerical calculation in this article. A new concept of non-saturation sediment flux is proposed together with the derived mathematical expression. The theoretical solutions of vertical distribution of sediment concentration in non-equilibrium transportation are deduced,which include the exponential formula and power formula(Rouse formula) ,as well as the method of sediment concentration on bottom. At the same time,the two-dimensional diffusion equations on longitudinal section are resolved using the finite difference method. The arithmetical solutions of vertical distribution of sediment concentration in non-equilibrium transportation are worked out with different parameters,and coincident with the theoretical results from formulas except in a few cases with small errors.更多还原