围填海工程对三门湾纳潮量和水交换的影响  

Influence of reclamation project on tidal volume and water exchange in Sanmen Bay

作　　者：韩慧慧 高飞[2] 丁咚[1] 马乐 HAN Huihui;GAO Fei;DING Dong;MA Le(College of Marine Geoscience,Ocean University of China,Qingdao 266100,China;Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266237,China)

机构地区：[1]中国海洋大学海洋地球科学学院,青岛266100 [2]中国地质调查局青岛海洋地质研究所,青岛266237

出　　处：《海洋地质前沿》2024年第5期40-50,共11页Marine Geology Frontiers

基　　金：国家重点研发计划“河口三角洲生态环境地球观测应用研究”(2019YFE0127200);海岸带生态地质调查工程“重要河口及湿地滩区生态地质调查”(DD20221775)。

摘　　要：以浙江省三门湾为研究区域,基于MIKE21水动力模型模拟了三门湾及附近海域2000、2009和2019年的水动力特征,分析探讨围填海工程对三门湾纳潮量及水交换能力的影响,计算结果表明:2000、2009和2019年的最大纳潮量分别为5.06×10^(9)、4.95×10^(9)和4.85×10^(9)m^(3),最小纳潮量分别为1.92×10^(9)、1.90×10^(9)和1.80×10^(9)m^(3),平均纳潮量分别为3.55×10^(9)、3.39×10^(9)和3.21×10^(9)m^(3)。围填海工程致使2000—2009、2009—2019年平均纳潮量分别减小了4.51%和5.31%;通过保守物质浓度扩散来定量分析三门湾的水交换能力,得到2000年半交换周期介于21~27 d,2009年半交换周期介于23~29 d,2019年半交换周期介于23~30 d。湾内保守物质浓度减少90%的时间周期分别为2000年58 d,2009年延长了7 d达到65 d,2019年继续延长至69 d。三门湾的围填海工程削弱了湾内的水动力条件和水交换能力,可进一步影响泥沙输运和水质环境。Taking Sanmen Bay in Zhejiang Province as the research area,the hydrodynamic characteristics of Sanmen Bay and its surrounding waters in 2000,2009,and 2019 were simulated based on the Mike21 hydrodynamic model,and the impact of the reclamation project on the tidal volume and water flow in Sanmen Bay was analyzed and discussed.The calculation result of exchange capacity proves that in 2000,2009,and 2019,the maximum tidal volume was 5.06×10^(9)m^(3),4.95×10^(9)m^(3),and 4.85×10^(9)m^(3),and the minimum tidal volume was 1.92×10^(9)m^(3),1.90×10^(9)m^(3),and 1.80×10^(9)m^(3),on average of 3.55×10^(9)m^(3),3.39×10^(9)m^(3),and 3.21×10^(9)m^(3),respectively.The average tidal volume from 2000 to 2009 decreased by 4.51%,and from 2009 to 2019,decreased by 5.31%.The water exchange capacity was quantitatively analyzed by conservative substance concentration diffusion.The semiexchange duration in 2000 was 21-27 d,in 2009 was 23-29 d,and in 2019 was 23-30 d.The time for the concentration of conservative substances in the bay reaching 90%in the three stages was 58 days in 2000.In 2009,it extended additional 7 days to 65 days,and continued to increase to 69 days in 2019.The reclamation of Sanmen Bay has weakened the hydrodynamic conditions and water exchange capacity in the bay.The research results provide a scientific basis for the analysis of the impact of the reclamation project on the hydrodynamic environment of Sanmen Bay,and also a basis and reference for the decision-making of the construction and management of Sanmen Bay.

关 键 词：数值模拟 水动力 三门湾 纳潮量 水交换能力 

分 类 号：P736[天文地球—海洋地质] P731.2[天文地球—海洋科学]