钦州湾围滩工程前后潮流场的数值模拟

基于双时间层的有限差分方法(ADI),建立了水深平均二维浅水潮流数学模型,采用逆风格式和追赶法求解二维浅水方程,通过建立钦州湾二维潮流数值模型重现钦州湾的潮位和潮流变化状况。模拟结果与同步进行的岸边潮位及海上潮流的观测值校验结果表明,实测潮位资料与对应时间的计算结果吻合良好,实测潮流与对应时间的计算结果十分接近。模拟计算结果真实地反映钦州湾的潮位变化和潮流运动状况。钦州湾围滩工程实施前后的潮流场数值模拟研究结果表明该工程建设不会对海域水动力学条件产生较大影响。

Numerical simulation of tidal current field before and after engineering proied in Qinzhou Bay

A 2-D average water depth numerical model for unsteady tidal flow was established using the finite difference method on double time layer meshes.The 2-D shallow water equations were solved by upwind scheme and chase technique.The 2-D model was adopted to calculate the tidal current of Qinzhou Bay.The results,compared with the simultaneously measured value of the bank tide level and the tide at sea, show that the practical measured values coincide very well with the calculations at the corresponding time.The calculated results actually report the change of the tide level and the movement of the tide of Qinzhou Bay.The model was applied to simulate tidal circulation of the engineering project of enclosing beach in Qinzhou Bay.The overall performance of the model indicates that construction of the project will not affect the hydrodynamics condition of sea area evidently, and will only have a little influence on the place near the quay.