金塘岛北部海域地形变化对水动力环境的影响  

Influence of Topography Change on Hydrodynamics in the Sea Area to the North of the Jintang Island

作　　者：苏毓 纪棋严 左军成 蔡云霞 孙永钊 彭腾腾 张洁 SU Yu;JI Qi-yan;ZUO Jun-cheng;CAI Yun-xia;SUN Yong-zhao;PENG Teng-teng;ZHANG Jie(Marine Science and Technology College,Zhejiang Ocean University,Zhoushan 316022,China;College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China)

机构地区：[1]浙江海洋大学海洋科学与技术学院,浙江舟山316022 [2]上海海洋大学海洋科学学院,上海201306

出　　处：《海洋科学进展》2022年第3期536-550,共15页Advances in Marine Science

基　　金：浙江省基础公益研究计划——浙江近海高分辨率浪-潮-流耦合数值预报系统(LGF22D060001);国家重点研发计划课题——全球高分辨率潮汐潮流数值模式研制(2016YFC1401406)。

摘　　要：浙江舟山金塘岛北部围填海工程使其周边海域的地形产生了较大的变化。本文利用数值模拟方法研究了该围填海工程引起的地形变化对金塘岛周边海域的潮流、余流以及泥沙冲淤的影响。研究结果表明:地形变化对沥港水道影响较大,水道北部入口位置向北移,入口处流速明显增大,涨急流速由0.50 m/s增强为0.92 m/s,增强了84%,落急流速由0.30 m/s增强为0.53 m/s,增强了77%,余流流速由0.05 m/s增强为0.12 m/s,增强了140%;沥港水道中部转角处落急流速减弱;围填海工程新生成的岬角处流速变化也较大,2个岬角凹处形成旋转流场,涨急流速由0.46 m/s减弱至0.14 m/s,减弱了70%,落急流速由0.61 m/s减弱至0.17 m/s,减弱了72%,余流流速由0.55 m/s减弱至0.04 m/s,减弱了93%。金塘岛北部海域泥沙淤积分布与余流变化大小分布一致,表明两者密切相关且均受地形变化影响显著。The reclamation project in the north of the Jintang Island has greatly changed the topography of its surrounding sea areas,and thus impacts the hydrodynamics in the sea areas.Based on observational data and numerical simulations,this paper analyzes the impacts of the reclamation project on tidal currents,residual currents,erosion,and deposition in the sea areas near the Jintang Island.The results show that the topography change has a great impact on the Ligang channel-its northern entrance shifts to the north and the current velocity at the entrance increases significantly.The maximum flood velocity increases from 0.50 m/s to 0.92 m/s,an increase of 84%,the maximum ebb velocity increases from 0.30 m/s to 0.53 m/s,an increase of 77%,and the residual current velocity increases from 0.05 m/s to 0.12 m/s,an increase of 140%.The maximum flood velocity at the central part of the Ligang channel decreases.The current velocity near the newly formed headland by the reclamation also changes significantly,with rotating flow field formed between the two headlands.The maximum flood velocity decreases from 0.46 m/s to 0.14 m/s,weakened by 70%,the maximum ebb velocity decreases from 0.61m/s to 0.17 m/s,weakened by 72%,and the residual current velocity decreases from 0.55 m/s to 0.04 m/s,weakened by 93%.The spatial distribution of sediment deposition in the sea areas to the north of the Jintang Island is consistent with that of residual current change,suggesting that they are closely related and significantly affected by the topography change.

关 键 词：金塘 地形变化 SCHISM(Semi-implicit Cross-scale Hydroscience Integrated System Model) 潮流 余流 冲淤 

分 类 号：P731.2[天文地球—海洋科学]