Effect of non-submerged pile foundations on the tidal and sediment dynamics in Hangzhoubay
LI Li
CHEN Xin
REN Yihan
XIA Yuezhang
Abstract：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 ana-lyzed 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 be-fore and after the construction of pile foundation,the distribution of the suspended sediment concentra-tion(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 af-fected 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.
Keywords：non-submerged pilesHangzhou bayZhoushan archipelagoshydrodynamicssediment dynamics
Publication Date：2025-02-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：12( 24-35 )