荆江重点浅滩整治的二维动床数学模型研究

本文针对荆江河道边界形状复杂、长宽相差悬殊及水沙具有明显的二维特征．建立了贴体正交曲线坐标系下河道二维动床数学模型。给出了正交曲线坐标系下二维动床数学模型的控制方程、控制方程的离散及数值解法、边界条件及动边界技术。细致地模拟了荆江卵石夹沙河床及沙质河床浅滩河段的水面线、流速场、含抄量浓度场及河床变形。计算的水位、流速分布及河床变形与实测资料吻合良好。在分析河床演变规律及浅滩成因的基础上．进行了不同组次来水来沙水文年的多个整浩方案的数值试验，探讨了重点浅滩段整治原则及整治工程的初步布置。

Study on two dimensional mathematical model for regulating typical shoals in fluvial Jinjiang river

According to the characteristics of complicated boundary figures, great disparity between width and length of computational domin and the 2- D character of water and sediment distribution on Jinjiang river, the 2- D mobile bed mathematical model in the fitting orthogonal curvillinear coordinates was developed in this paper. The govern equations, the separation and numerical solution of the govern equation in the orthogonal curvillinear coordinates, the boundary condition and the movable boundary technique were presented. The water surface level, velocity field and sediment concentration field of gravel sand bed and sand bed reach on Jianjiang river were refined simulated. The calculated results show that, the water level, the velocity distribution and the river bed deformation were in close agreement with the field results. Based on analysis of fluvial process and the reason of the shoal deformation many kinds regulated layouts with different water and sediment hydrology year were numerically experimented. The regulated principle and the regulated engineering preliminary layouts of the typical shoal on Jinjiang river were presented.