欧拉法和拉格朗日法比较分析人工岛工程下水体交换特性  

The comparative analysis of water exchange characteristics under artificial island by Eulerian and Lagrangian method

作　　者：俞露露 匡翠萍[1] 顾杰 董智超 张甲波[3] YU Lu-lu;KUANG Cui-ping;GU Jie;DONG Zhi-chao;ZHANG Jia-bo(College of Civil Engineering,Tongji University,Shanghai 200240,China;College of Marine Ecology and Environment,Shanghai Ocean University,Shanghai 201306,China;The Eighth Geological Brigade,Hebei Geological Prospecting Bureau,Qinhuangdao 066001,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]上海海洋大学海洋生态与环境学院,上海201306 [3]河北省地矿局第八地质大队,秦皇岛066001

出　　处：《水动力学研究与进展（A辑）》2020年第4期488-496,共9页Chinese Journal of Hydrodynamics

基　　金：国家重点研发计划项目(2019YFC1407900)。

摘　　要：基于MIKE21软件建立二维潮流、保守物质输运和粒子追踪模型,采用欧拉法和拉格朗日法比较分析水体交换时间尺度的异同点,探究金梦海湾近岸人工岛建设对水体交换的影响,结果表明:①运用欧拉法和拉格朗日法计算得出研究区域内余流的大小和方向基本一致,且斯托克斯余流比拉格朗日余流小一个量级;②工程后,汤河口内余流减小80%-90%,莲花岛附近区域余流比工程前增大10-60倍;③余流的大小和方向对金梦海湾近岸水体交换有一定影响,即工程后水体半交换时间在海域减小,汤河口内部增加;④运用拉格朗日法与欧拉法计算得出水体交换时间分布相似,且拉格朗日法计算的驻留时间受粒子释放时刻的影响较大,尤其是潮间带和东侧开边界海域的变差系数CV值最大可达1.5。To explore the influence of artificial island construction near Jinmeng Bay on water exchange, a twodimensional hydrodynamic, conservative matter transport and particle tracking model was established based on MIKE21, and the Eulerian and Lagrangian method were used to analyze the time scale of water exchange and the influence of artificial island construction near Jinmeng Bay on water exchange. Numerical results reveal that: (1) The patterns of Lagrangian and Eulerian residual currents are similar, and the Stokes residual current is only about 10% of the Eulerian residual current and Lagrangian residual current. (2) The residual current in Tanghe estuary decreases by 80%~90% after the artificial island construction, and increment of residual current is about 10-60 times near Lotus island. (3) Water exchange has been influenced by the residual current in Jinmeng Bay, which induces that the half exchange time deceases in the coastal area and increases inside Tanghe estuary after the project. (4) The distribution patterns of water exchange time calculated by the Eulerian and Lagrangian method are similar. The residence time calculated by the Lagrange method is greatly influenced by the release time of particles and the maximum value of variation coefficient CV in the intertidal zone and eastern open boundary can reach to 1.5.

关 键 词：人工岛 水体交换 欧拉法 拉格朗日法 余流 

分 类 号：P731.26[天文地球—海洋科学]