文献类型：期刊文献

中文题名：裂流对污染物输运机制影响数值模拟

英文题名：Numerical Simulation of Impact of Rip Currents on Pollutant Transport Mechanisms

作者：孙琰[1,2];陈滔[1,2];刘璐璐[1,2];卞晓东[1,2];朱道恒[1,3];李志强[1,3]

机构：[1]广东海洋大学电子与信息工程学院,广东湛江524088;[2]广东海洋大学化学与环境学院,广东湛江524088;[3]广东省海洋遥感与信息技术工程技术中心,广东湛江524088

年份：2025

卷号：45

期号：5

起止页码：43

中文期刊名：广东海洋大学学报

外文期刊名：Journal of Guangdong Ocean University

收录：北大核心2023、、北大核心

基金：国家自然科学基金(42176067);广东省基础与应用基础研究基金自然科学基金(2024A1515011427);广东海洋大学优秀研究生学位论文培育项目(202431)。

语种：中文

中文关键词：裂流;数值模拟;近岸水动力;污染物输运;半交换时间

外文关键词：rip currents;numerical simulation;coastal hydrodynamics;pollutant transport;half-exchange time

中文摘要：【目的】探究裂流对污染物输运行为的影响,讨论其对近岸水体更新、生物响应及人类工程活动的潜在意义。【方法】基于Delft3D中的FLOW与WAVE模块建立数值模型,构建理想化的沙坝-沟槽裂流地形,在典型波浪工况与近岸污染物排放的情况下,模拟裂流系统的水动力响应与污染物输运扩散。引入水体半交换时间指标,定量评估裂流系统对污染物行为特征的影响,并探讨生物行为过程与近岸工程对污染物扩散的影响。【结果与结论】裂流的形成与波浪条件密切相关,高能浪况下离岸水流更强且结构更清晰,斜向入射波会影响裂流方向但对其强度影响有限;裂流系统的出现不一定增强物质向海输运。在典型特征点,裂流强度增强时水体半交换时间缩短可达10%,与无沙坝地形相比则延长约53%,表明其对污染物的输运有双重作用:在一定程度上,裂流强度与污染物离岸输运及水体混合能力呈正相关,但沙坝结构也导致非主要裂流区水体交换能力降低。

外文摘要：【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.