| 基于波-流耦合模型的珠江口悬浮泥沙数值模拟 |
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| 引用本文： | 刘广平,蔡树群.基于波-流耦合模型的珠江口悬浮泥沙数值模拟[J].海洋学报(英文版),2019,38(7):22-35. |
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| 作者姓名： | 刘广平 蔡树群 |
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| 作者单位： | 热带海洋环境国家重点实验室(中国科学院南海海洋研究所), 广州 510301;中国科学大学, 北京 100049,热带海洋环境国家重点实验室(中国科学院南海海洋研究所), 广州 510301;Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China |
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| 基金项目： | The National Natural Science Foundation of China under contract Nos 41890851 and 41521005; the Key Research Program of Frontier Sciences, Chinese Academy of Sciences under contract No. QYZDJ-SSW-DQC034; the Foundation of Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences under contract No. ISEE2018PY05. |
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| 摘 要： | 为研究珠江口悬浮泥沙输运动力机制，本文发展了一套三维波、流、泥沙耦合数值模型。模型结果与观测数据吻合较好，统计显示模型获得良好的评分分值。利用数值模拟研究了不同强迫（径流，波浪和风）对珠江口中悬浮泥沙的影响。模型结果表明，河口重力环流对珠江口最大浑浊带的发展起着重要作用，特别是在小潮期间。另外，径流的增加可导致泥沙向海输运。底部的悬浮泥沙浓度随着波浪底部轨迹速度和波高的增大而增加。由于西滩水深较浅，波浪对西滩悬浮泥沙的影响大于东槽。西南风引起的波浪对悬沙的影响大于东北风引起的波浪的影响，而东北风致流对悬沙的影响略大于对西南风致流的影响。在其他条件相同情况下，稳定的西南风比稳定的东北风更有利于伶仃洋悬浮泥沙浓度的增加；在稳定的西南风下，伶仃洋平均悬浮泥沙浓度约为稳定东北风下的1.1倍。
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| 关 键 词： | 悬浮泥沙 浊度 区域海洋模式系统(ROMS) 珠江口 |
| 收稿时间： | 2018/3/1 0:00:00 |
Modeling of suspended sediment by coupled wave-current model in the Zhujiang (Pearl) River Estuary |
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| LIU Guangping and CAI Shuqun.Modeling of suspended sediment by coupled wave-current model in the Zhujiang (Pearl) River Estuary[J].Acta Oceanologica Sinica,2019,38(7):22-35. |
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| Authors: | LIU Guangping and CAI Shuqun |
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| Institution: | 1.State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;University of Chinese Academy of Sciences, Beijing 100049, China2.State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China |
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| Abstract: | A three-dimensional wave-current-sediment coupled numerical model is developed to understand the sediment transport dynamics in the Zhujiang(Pearl) River Estuary(ZRE), China. The model results are in good agreement with observed data, and statistics show good model skill scores. Numerical studies are conducted to assess the scenarios of suspended sediment in the ZRE under the effects of different forcing(river discharges, waves, and winds). The model results indicate that the estuarine gravitational circulation plays an important role in the development of estuarine turbidity maximum in the ZRE, particularly during neap tides. The increased river discharge can result in a seaward sediment transport. The suspended sediment concentration(SSC) in the bottom increases with both wave bottom orbital velocity and wave height. Because of the shallow water depth, the effect of waves on sediment in the west shoal is greater than that in the east channel. The southwesterly wind-induced wave affects the SSC more than those resulting from the northeasterly wind, while the northeasterly wind-driven circulation has a slightly greater influence on the SSC than that of the southwesterly wind. However, a steady southwesterly wind condition favors the increase of the SSC in the Lingding Bay more so than a steady northeasterly wind condition. If the other forcings are same, the averaged SSC under a steady southwesterly wind condition is about 1.1 times that resulting from a steady northeasterly wind. |
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| Keywords: | sediment transport turbidity Regional Ocean Modeling System (ROMS) Zhujiang River Estuary |
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