台州港黄礁港区悬沙输移规律研究

Study on suspended sediment transport in Huangjiao port area of Taizhou Harbor

采用经过水沙验证的潮流泥沙数学模型,模拟了大港湾水域的水沙运动特点,计算了港池泥沙回淤量。模拟结果表明,港池泥沙来源主要为大港湾后方浅滩落潮流挟沙;港池口门处的防波堤对减轻港池泥沙回淤的效果并不显著,港池后方修建围堰可使港池回淤量减小2/3;围堰阻挡了浅滩泥沙进入港池的通道。同时大港湾形成的半封闭港池具有流弱、沙少、回淤较轻的特点,经过相应的工程措施可成为一个优良的港湾。

Based on the recent hydrologic data and the seabed evolution,the numerical model was validated. The movements of tidal current and sediment in Dagangwan bay were simulated,and the deposition volume in port basin was calculated.The results show that the sediment source is mainly from the shoal caused by ebb current.The effect in reducing sediment silting is not obvious by the breakwater near the harbor basin entrance. However,the sediment silting is decreased by two-thirds after construction of the cofferdam rear the bay.The cofferdam can prevent the sediment from the shoal to the harbor.Meanwhile,the Dagangwan bay will be the semienclosed harbor with the weak current,less sediment and slight siltation,and it will be an excellent harbor by some corresponding measures.