唐岛湾整体疏浚后的冲淤演变研究

Study on the Evolution of Scouring and Deposition for Dredging Engineering in Tangdao Bay

因唐岛湾内将实施整体疏浚工程,其必将导致湾内水动力条件及泥沙输运方式改变。由于唐岛湾海域地形的特殊性,目前尚未有较好的公式应用于其冲淤演变计算或疏浚工程效果预测。为分析在极端波浪和潮汐作用下唐岛湾海域清淤工程实施后的地形演变,文中应用Mike21软件建立了唐岛湾整体水动力和泥沙模型,并应用实测资料与物理模型试验成果对疏浚工程实施后在极端工况下的冲淤变化数值计算结果进行了对比与验证,获得了两种模型演变规律基本一致的结果,为类似半封闭海湾整体疏浚工程的设计、施工和管理提供了参考依据。

According to the design of dredging engineering for Tangdao Bay,when this engineering is finished,both of hydrodynamic conditions and sediment transport way will take place changes.The calculation formulas for evaluating the evolution process of scouring and deposition are not appropriate for the whole Tangdao Bay.In this paper,the hydrodynamic numerical simulation software Mike21 developed by DHI and a physical model are respectively set up,and used them to simulate its hydrodynamic environment and sediment transport,the topographical evolution in the bay after the dredging engineering being finished are analyzed by the comparison the numerical simulating results with the data of physical model tests,and the change of erosion and deposition of numerical model under extreme conditions is further verified and predicted too.This paper will provide the valuable references for dredging engineering practice in a Semi-closed Bay.