灌河口外拦门沙治理物理模型试验研究

A Simulation Study on Regulatory Works of Bar Shoal in Guanhe Estuary

The physical model is constructed with three open boundaries to simulate the natural condi- tions in Guanhe Estuary.Applying the water discharge control technology to three open boundaries, the authors have succeeded in reproducing the complicated rotating tidal current in the model of Guan- he Esturay,and in making many experinents on the regulatory works of bar shoal.The results indicate that to develop the deep channel in the Guanhe Estrauy,the principle of combining dredging with reg- ulating should be taken. In open areas without regulating engineering projects,the larger the dredged depth of the channel,the larger the angle between the tidal current and the axial line,and the more the current velocity attenuation.In the selection of the channel axis in the open area,the axis should follow the main direction of the tidal current,and be perpendicular to the isobath of the outer sea.In the plane layout of double dikes,the sudden expansion or contraction should be avoided.The elevation of the top of the dike should be identical with middle tide level.These experimental results can be used by designing departments for reference.