摘要
结合经典Rouse方程推导中的几个主要假设从泥沙垂向扩散系数和水流垂向流速作为出发点,分析了经典Rouse方程在河口海岸地区的适用性,并给出了垂向扩散系数一般形式时的悬沙分布方程。明确推导了由Rouse方程确定泥沙沉降速率的计算公式。考虑到传统的泥沙理论是建立在假设垂向流速忽略的基础上,而在河口海岸地区的实际问题中,不可忽视的垂向流速导致泥沙守恒方程形式中多出了因为垂向流速产生的输运量,通过引入垂向流速分布函数对经典Rouse方程进行了适当的修正,明确给出了受潮汐影响水域中的Rouse方程形式。
According to some main assumptions in the Rouse equation,it takes the vertical eddy viscosity and vertical velocity as the starting point,and analyzes the applicability of the Rouse equation at the estuary and coast areas.It deduces the equation of sediment vertical distribution for the general form of eddy viscosity coefficient.In addition,it deduces the computation formula of sediment settling velocity.In the end,the traditional sediment theory is built on the assumption that the vertical velocity can be neglected.However,at the estuary and coast areas the vertical velocity can be the same magnitude with the sediment settling velocity,and it adds the transport flux because of the vertical velocity in the sediment conservation equation.It modifies the Rouse equation by introducing the distribution function of vertical velocity,and it also derives the new Rouse equation in the area which can be influenced by the tide wave.
出处
《水运工程》
北大核心
2010年第11期17-21,共5页
Port & Waterway Engineering
