非淹没桩基对杭州湾海域潮动力与泥沙特性的影响  

Effect of non-submerged pile foundations on the tidal and sediment dynamics in Hangzhoubay

作　　者：李莉[1,2] 陈新 任一晗[1] 夏乐章 LI Li;CHEN Xin;REN Yihan;XIA Yuezhang(Ocean College,Zhejiang University,Zhoushan 316021,China;Key Laboratory of Offshore Geotechnical and Material Engineering of Zhejiang Province,Hangzhou 310058,China)

机构地区：[1]浙江大学海洋学院,浙江舟山316021 [2]浙江省海洋岩土工程与材料重点实验室,浙江杭州310058

出　　处：《海洋湖沼通报(中英文)》2025年第1期24-35,共12页Transactions of Oceanology and Limnology

基　　金：国家基金委(41976157,42076177);浙江省专项(2020C03012,2021C03180)。

摘　　要：非淹没桩基作为海洋工程的必备支撑,极大地影响区域海洋的动力特性与生态环境。基于三维海洋-泥沙动力数值模型,以杭州湾海域为研究对象,分析非淹没桩基建设对涌潮与开阔海域潮汐动力与悬沙特性的影响。结果表明:桩基建设前后,潮流、悬沙浓度的变化趋势在桩周空间上的分布具有较高的一致性;由于桩基阻水,桩周有明显绕流现象;迎水面壅水,背水面形成低流负压区,显著增大了桩基附近海域涡度的数量级;流速与切应力降低,悬沙浓度随之降低;桩基之间流速与悬沙浓度增大。涌潮区域,大桥影响分潮相位进而影响潮位与潮不对称。涨落潮流向基本垂直于大桥桩基布置轴线,大桥阻水绕流效应改变局部流态。近底层流速变化导致底应力变化,影响沉积物再悬浮过程,进而改变悬沙浓度。大桥建设初期加快/减缓了海/陆侧南岸的向南泥沙通量。开阔海域风机桩基影响类似,量级较小。As necessary support for coastal engineering,non-submerged pile foundation greatly affects the coastal hydrodynamics and ecological environment.Taking Hangzhou bay as an example,we analyzed the influence of non-submerged pile foundation on the tidal dynamics and suspended sediment characteristics using a three-dimensional hydro-sediment numerical model.The results showed that before and after the construction of pile foundation,the distribution of the suspended sediment concentration(SSC)correlated with the currents.Owing to the blocking effect of pile foundations,there was an obvious cylindrical disturbed flow around the piles.The bridge blocked water and formed a low-flow negative pressure zone at the back side,and increased the order of vorticity near the pile foundation;the flow velocity and SSC increased between the pile foundations.The bridge affected the tidal phase and thus the tidal level and tidal asymmetry.The peak and ebb current direction was basically perpendicular to the axis of the bridge.Variations in the near bottom velocity changed the bottom stress,which affected the sediment resuspension and thus changed the SSC.The construction of the bridge accelerated/slowed down the southward sediment flux on the sea/land side.Turbine piles in the open ocean had similar effects with smaller magnitudes.

关 键 词：非淹没桩基 杭州湾 舟山海域 水动力特性 泥沙动力特性 

分 类 号：P752[天文地球—海洋科学]