伶仃洋潮不对称对地形变化的响应研究  

Study on the response of tidal asymmetry to topographic change in Lingding Bay

作　　者：庄誉伟 季小梅[1,2] 张蔚[1,2] 王晓光[1] 黄黎明 ZHUANG Yuwei;JI Xiaomei;ZHANG Wei;WANG Xiaoguang;HUANG Liming(College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing 210024,China;Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security,Hohai University,Nanjing 210024,China)

机构地区：[1]河海大学港口海岸与近海工程学院,南京210024 [2]江苏省海岸海洋资源开发与环境安全重点实验室(河海大学),南京210024

出　　处：《水道港口》2025年第1期21-29,共9页Journal of Waterway and Harbor

基　　金：国家重点研发计划项目(2023YFC3008100)。

摘　　要：基于Delft3D FM软件建立二维水动力模型,利用T_Tide对模型结果的时间序列进行调和分析,并引入偏度概念对潮位历时不对称(TDA)、潮流流速不对称(FVA)和潮流历时不对称(FDA)进行量化分析,从而开展伶仃洋由于航道疏浚和海床采砂引起的地形变化对潮动力的影响研究。结果表明:伶仃洋的TDA呈湾口为落潮主导,湾顶为涨潮主导,涨落潮历时沿程逐渐变化的趋势;航道疏浚会增大伶仃洋的落潮优势,削弱涨潮优势;海床采砂会增大伶仃洋涨潮优势和削弱落潮优势。伶仃洋的FVA主要呈落潮流主导,有利于粗颗粒沉积物向海输移,航道疏浚和海床采砂都会削弱伶仃洋FVA的落潮流优势,但后者会局部增强湾顶附近水域的不对称强度。伶仃洋的FDA整体呈落憩历时更短,航道疏浚会使得伶仃洋的落憩历时增加,而海床采砂对伶仃洋的FDA影响不显著。Based on the Delft3D Flow Flexible Mesh,a two-dimensional hydrodynamic model was established to study the influence of topography changes caused by channel dredging and seabed sediment extraction on tidal dynamics in the Lingding Bay.Harmonic analysis of the modelled tidal elevation and tidal currents were done by T-Tide,and the TDA,FVA and FDA were quantified by the concept of skewness.The results show that the TDA of the Lingding Bay is dominated by ebb tide near the bay mouth and flood tide in the bay head area.The advantage of ebb tide is favored by the topography changes caused by channel dredging,whereas the advantage of flood tide is prompted by the topography changes resulting from seabed sediment extraction in the Lingding Bay.The FVA of the Lingding Bay is mainly dominated by the ebb current,which is conducive to the seaward transport of coarse sediment.The ebb current advantage of the FVA of the Lingding Bay is weakened by both channel dredging and seabed sediment extraction,and the latter partially enhances the asymmetry strength near the bay head.A shorter ebb duration of FDA is presented in the Lingding Bay,which is increasedby channel dredging.However seabed sediment extraction has little impact on FDA in the Lingding Bay.

关 键 词：伶仃洋 地形变化 潮不对称 航道疏浚 海床采砂 水动力模型 

分 类 号：U65[交通运输工程—港口、海岸及近海工程] P731.2[交通运输工程—船舶与海洋工程]