二维水沙模型在深圳港铜鼓航道选线研究中的应用

采用边界拟合坐标系下的水流基本方程和泥沙连续方程及河床变形方程,建立二维动边界非恒定水流泥沙数学模型。根据研究水域的泥沙特点及冲淤特性,分别处理冲淤系数,提出了实用的挟沙能力公式,并辅之于动边界技术,增强了模型的适应性和灵活性。以深圳港铜鼓航道选线研究为例,对模型进行了验证及航道开挖回淤计算。结果表明,模型能较好地模拟河口水流泥沙运动及河床变形情况,且计算稳定性好,速度快,精度较高。水流、泥沙运动、冲淤验证成果基本能达到规范要求的精度。

The application of 2D current-sediment model in the study on choosing course in Tonggu Channel of Shenzhen Port

The basic current equation, sediment continuous equation, and riverbed deformation equation under the boundary-fitted orthogonal curvilinear grid are adopted to establish 2D mobile boundary unsteady current and sediment model. The silt function is treated separately and the practical sediment carrying capacity is put forward according to the sediment and silt characteristics of the studied water area, and the adaptability and agility of the model has been improved with the help of the mobile boundary technology. The model is used and the deposition amount after channel excavating is calculated with the study on Tonggu Channel of Shenzhen Port as an example. The result shows that the model can simulate the current-sediment movement and the riverbed deformation clearly, and is good in numerical stability and low computation cost. The numerical results of current-sediment movement and silt are satisfactory.