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采用X方向伸展坐标下的二、三维方程，建立了开辟或增深深水航道前后的潮流场数值模式。该模式在航道横向上网格变距，以保证航道横向上有一定量的网格覆盖。在计算中采用二、三维交替进行，既节省大量计算时间，又保证了计算的稳定性。模式应用在杭州湾深水航道试挖研究中，用5个测流站大、中、小潮各层的观测资料给于验证，流速相对平均误差为6％－10％，流向平均偏差大都在10°之间。计算表明在杭州湾航道增深4m后，垂直平均流速将减小15cm／s左右（约减小16％）。但在垂向上变化是不同的，底层减小较大，而表层还略有增大；流向挖前挖后除槽内底层外，几乎没有变化。
Using the two-dimensional and three-dimensional equations in the X-direction stretching coordinate, a numerical model of tidal flow field before and after opening up or deepening the deepwater channel was established. This mode changes the grid in the horizontal direction of the waterway to ensure a certain amount of grid coverage in the horizontal direction of the waterway. In the calculation of two, three-dimensional alternately, not only save a lot of computing time, but also to ensure the stability of the calculation. Modes of application In the study on the trial excavation of the deepwater channel of Hangzhou Bay, the observation data of five layers of large, medium and small tidal current stations are used for verification. The relative average error of flow rate is 6% -10% and the average deviation of flow direction is mostly 10 ° between. The calculation shows that the average vertical velocity will decrease about 15cm / s (about 16% decrease) after the Hangzhou Bay navigation channel deepens for 4m. However, the changes in the vertical are different, the bottom decreases larger, while the surface layer is also slightly increased; flow dug digging before the bottom of the trench, almost no change.