广东海洋大学学报2025，Vol.45Issue(5)：43-48,6.DOI:10.3969/j.issn.1673-9159.2025.05.006
裂流对污染物输运机制影响数值模拟
Numerical Simulation of Impact of Rip Currents on Pollutant Transport Mechanisms
摘要
Abstract
[Objective]This study aims to investigate the influence of rip currents on pollutant transport processes,and to explore their potential significance for coastal water renewal,biological responses,and human engineering activities.[Methods]A numerical model was developed using the FLOW and WAVE modules in Delft3D to simulate an idealized sandbar-channel rip current system.Under representative wave conditions and nearshore pollutant discharge scenarios,the hydrodynamic response and pollutant transport characteristics of the rip current system were simulated.The concept of half-exchange time was introduced to quantitatively assess the effects of rip currents on pollutant behavior.The analysis was further extended to include biological behavioral processes and nearshore engineering cases.[Results and Conclusions]The formation of rip currents is closely related to wave conditions:under the condition of high-energy wave forcing,offshore flows become stronger and more organized,while oblique wave incidence affects current direction but has limited influence on current strength.The presence of rip currents does not necessarily enhance offshore transport of substances.At a typical nearshore point,enhanced rip current strength reduced the half-exchange time by up to approximately 10%,whereas the presence of sandbars increased it by about 53%compared to the non-sandbar condition,indicating a dual effect on pollutant transport.On the one hand,stronger rip currents promote offshore transport and the mixing capacity of water bodies;on the other hand,the enclosure effect of sandbars weakens water exchange in non-rip areas.关键词
裂流/数值模拟/近岸水动力/污染物输运/半交换时间Key words
rip currents/numerical simulation/coastal hydrodynamics/pollutant transport/half-exchange time分类
海洋科学引用本文复制引用
孙琰,陈滔,刘璐璐,卞晓东,朱道恒,李志强..裂流对污染物输运机制影响数值模拟[J].广东海洋大学学报,2025,45(5):43-48,6.基金项目
国家自然科学基金(42176067) （42176067）
广东省基础与应用基础研究基金自然科学基金(2024A1515011427) （2024A1515011427）
广东海洋大学优秀研究生学位论文培育项目(202431) （202431）
