| WANG Hong,ZHU Shouxian,LI Xunqiang,ZHANG Wenjing,NIE Yu. 2018. Numerical simulations of rip currents off arc-shaped coastlines. Acta Oceanologica Sinica, 37(3):21－30 |
| Numerical simulations of rip currents off arc-shaped coastlines |
| 弧形海岸裂流的数值模拟研究 |
| Received:April 20, 2017 |
| DOI：10.1007/s13131-018-1197-1 |
| Key words:rip current arc-shaped coastline FUNWAVE model numerical simulation |
| 中文关键词: 裂流 弧形海岸 FUNWAVE模式 数值模拟 |
| 基金项目:The National Natural Science Foundation under contract Nos 41206163, 41076048 and 41376012; the Operation Expenses for Universities' Basic Scientific Research of Central Authorities under contract Nos 2011B05714 and 2014B06514. |
| Author Name | Affiliation | E-mail | | WANG Hong | Institute of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China
91937 Troops, Zhoushan 316000, China | | | ZHU Shouxian | College of Oceanography, Hohai University, Nanjing 210098, China | zhushouxian@vip.sina.com | | LI Xunqiang | Institute of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China | | | ZHANG Wenjing | Institute of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China | | | NIE Yu | Institute of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China | |
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| Abstract: |
| The rip currents induced by waves off arc-shaped coastlines are seriously harmful to humans, but understanding of their characteristics is lacking. In this study, the FUNWAVE model was used to calculate the wave-induced currents in the Haller experiment and the ideal arc-shaped coast similar to Sanya Dadonghai, Hainan Province, China. The results showed that the FUNWAVE model has considerable ability to simulate the rip currents, and it was used to further simulate rip currents off arc-shaped coastlines to investigate their characteristics. The rip currents were found to be stronger as the curvature of arc-shaped coastline increased. Coastal beach slope exerts a significant influence on rip currents; in particular, an overly steep or overly mild slope is not conducive to creating rip currents. Furthermore, the rip currents were found to become weaker as the size of arc-shaped coast decreased. When the height and period of waves increase, the strength of rip currents also increases, and, in some cases, wave heights of 0.4 m may produce dangerous rip currents. |
| 中文摘要: |
| 弧形海岸波浪产生的裂流严重危害人类活动，但是目前对其特征缺乏充分认识。本文对Haller物理模型实验和三亚大东海的数值模拟表明FUNWAVE模式具有较好的裂流模拟能力。基于该模式进行了多种弧形海岸条件的裂流数值模拟，给出裂流的一些特征：（1）海岸弯曲度增大，裂流增强；（2）海岸坡度对裂流有比较大的影响，太陡或太平缓的海岸不利于形成裂流；（3）海岸尺寸减小，裂流减弱；（4）波高和波周期增大，裂流增强，但是对于某些海岸而言，0.4m波高可能就存在危害比较大的裂流。 |
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