东山八尺门海堤开口水动力及冲淤影响数值研究-海洋预报

东山八尺门海堤开口水动力及冲淤影响数值研究

作者：万艳

单位：福建省水产设计院, 福建福州 350003

分类号：P731.2

出版年·卷·期（页码）：2022·39·第六期（13-24）

摘要：

使用区域海洋模式建立了东山湾—诏安湾海域三维水动力-泥沙耦合模式，通过比较实测数据和模式计算的潮流场数据，验证了模式的模拟效果。在此基础上，用数值模式模拟了八尺门海堤开口前后的水动力特征、泥沙冲淤分布特征及变化情况。结果表明：海堤开口后，八尺门东侧水道流速增大，西侧水道流速减小，汇潮线西移，从而使八尺门东侧水道从淤积区域转化为冲刷区域，西侧水道从冲刷区域转化为淤积区域。海堤开口后八尺门水道的余流从东山湾流向诏安湾，使东山湾和诏安湾的海水半交换周期减少，八尺门附近的水动力环境有改善。

A three-dimensional hydrodynamic-sediment coupled model is established for the Dongshan Bay and Zhao'an Bay area using a regional ocean model, which is validated by the in-situ observation in the tidal field. Furthermore, the coupled numerical model is used to simulate the characteristics of hydrodynamics, sediment scouring and silting before and after the opening of the Bachimen seawall. The results show that the flow velocity of the eastern channel of the Bachimen increases after the opening of the seawall, while the flow velocity of the western channel decreases. In addition, the tidal convergent line moves westward, which makes the eastern channel turning from silting area to scouring area and the western channel turning from scouring area to silting area. After the opening of the seawall, the residual flow of the Bachimen channel flows from Dongshan Bay to Zhao'an Bay, which reduces the seawater semi-exchange cycle and improves the hydrodynamic environment near the Bachimen area.

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