淤泥质海岸环抱式港池建设期的潮流泥沙数值模拟

Numerical simulation of tidal current and sediment during construction of surrounding basin in muddy coast

利用二维数值模型,对徐圩港大环抱方案工程期间的流场和含沙量分布进行了模拟计算,研究了口门尺度和港内布置形式对口门附近水动力特征及泥沙淤积的影响。结果表明,港内水域面积与口门过水面积的比值决定了口门附近水动力条件的强弱,而水动力条件则与口门附近港池、航道的淤积强度存在一定的反比例关系。在环抱式港池的建设初期,应尽量减小港内无效水域的面积,适当放宽口门宽度,从而在改善口门水流条件的同时,降低港内的淤积强度。

A 2D numerical model is established to simulate the flow field and the sediment concentration during construction of Xuwei Harbor surrounding project. The impact of the entrance scale and the layout of the inner harbor on the hydrodynamic characteristics and sediment deposition are studied. The result shows that the hydrodynamic condition near the entrance of the surrounding basin is determined by the ratio of the area in the harbor and the cross section area of the entrance, and the sediment deposition of the waterway and the basin near the entrance is inverse proportional to the hydrodynamic condition. In order to improve the flow condition near the entrance and reduce the siltation intensity in the harbor at the initial stage of the construction of the surrounding basin, the area of the useless waters in the harbor should be reduced and the entrance should be widened appropriately.