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根据平面二维非恒定流运动方程和连续方程推导出模型相似比尺,从而进行模型设计。模型上边界选在老盐仓,下边界定在金山,模拟总水域面积约2200km2;模型先按1998年实测的准1∶50000水下地形制作,并利用1998年大范围水文资料作初步验证,再运用2000年9月杭州湾实测水下地形及大范围同步水文测验资料对模型进行正式验证。验证结果表明,模型沿程潮位、模型测点流速、流向等均与水文测验资料吻合良好,达到了较高的验证精度,为杭州湾跨海大桥建成后对周围水域变化情况的预测和桥轴线与桥孔布设合理性论证奠定了坚实的基础。
The similarity scale of the model was deduced according to the motion equation of two-dimensional unsteady flow and the continuous equation of the plane, and the model was designed. The upper boundary of the model is selected from the old salt silo and the lower boundary is defined as Jinshan. The total simulated water area is about 2200km2. The model is first prepared according to the 1998 quasi-1: 50000 underwater topography and a preliminary validation is made with a large-scale hydrological data from 1998 The model was formally verified by using the measured underwater topography and a large-scale synchronized hydrographic test data from Hangzhou Bay in September 2000. The results of the verification show that the model tidal potential, the flow velocity and the flow direction of the measuring point of the model are in good agreement with the hydrographic test data, and the verification accuracy is high. The prediction of the change of the surrounding water area after the completion of the Hangzhou Bay Bridge and the bridge axis Laying a reasonable foundation with the layout of bridge openings laid a solid foundation.