| 摘要: |
| 台风是影响中国黄东海的强天气现象，其引起的强风、巨浪和台风增水严重威胁着沿海地区人民的生命与财产安全。本文以海浪模式SWAN（Simulating Waves Nearshore）与区域海洋模式ROMS（Regional Ocean Modeling System）为基础，构建了中国黄东海海域在201509号台风“灿鸿”影响下的海浪-海洋耦合模式。通过浮标与Jason-2高度计有效波高数据验证了模式结果的准确性。进行了敏感性实验分析，对比耦合（ROMS+SWAN）与非耦合（SWAN）下以及使用不同地形数据（ETOPO1、ETOPO2、GEBCO）、不同物理参数化方案（风能输入、白冠耗散、底摩擦耗散）下的模拟结果差异。结果发现在射阳与前三岛浮标处，使用GEBCO地形数据（15弧秒间隔）下的模拟效果更好且稳定。在空间分布上，台风中心附近的浪流相互作用显著，在其前进方向右侧表现为耦合的有效波高值低于非耦合有效波高值，差值最高可达1米。选择不同风输入与耗散项方案时的模拟差异主要发生在最大波高处，选择不同的风能输入与白冠耗散项方案带来的差异接近0.4米，而底摩擦项方案选择不同带来的差异接近1米。因而在模拟实际的海况时，需要综合考虑这些因素带来的影响，才能达到SWAN海浪模型最好的海浪模拟效果。 |
| 关键词: 台风浪 SWAN ROMS 耦合模式 |
| DOI：10.11759/hykx20191116001 |
| 分类号:P731 |
| 基金项目:国家自然科学基金项目（41506028）；江苏省青年科学基金（BK20150913）；国家重点基础研究发展计划项目（2016YFC1401407）；全球变化与海气相互作用专项项目（GASI-IPOVAI-04）；南京信息工程大学人才启动基金 |
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| Numerical simulation of typhoon waves under the influence of Typhoon “Chan-Hom” |
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DU Yan1, LIU Guo-qiang1, HE Yi-jun1, HAN Xue2
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1.School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China;2.Tidal Flat Research Center of Jiangsu Province, Nanjing 210036, China
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| Abstract: |
| Typhoon can cause catastrophic damages to the coastlines of the Yellow Sea and the East China Sea. In this study, the wave model Simulating Waves Nearshore (SWAN) and the Regional Ocean Modeling System (ROMS) are applied on the wave-ocean coupling simulations under the forcing of the typhoon Chan-Hom (201509) in the coastal regions of the Yellow Sea and East China Sea. The model results were validated by measured significant wave height (SWH) data from available buoys and altimeter onboard satellite Jason-2. Several sensitivity experiments were conducted to examine the difference in simulation results under different terrain data (ETOPO1, ETOPO2, and GEBCO); coupled and uncoupled models (SWAN + ROMS and SWAN); and different physical parameterization schemes (wind energy input, whitecapping, and friction dissipation). It was found that the modeled results using GEBCO topographic data (at 15 arc-second intervals) at the Sheyang and Qiansandao buoys are in agreement with the buoy measurements than using other topographic data. We found that the wave-current interaction near the typhoon center was significant. On the right side of the typhoon-advancing direction, the coupled significant wave height was lower than the uncoupled results, and the difference in the significant wave heights between coupled and uncoupled simulations can even reach 1 m. The differences between different physical parametric schemes occur mainly at the stage of highest wave height. The difference of wave heights between different wind energy inputs and whitecapping dissipation schemes can be close to 0.4 meters whereas the difference in wave heights between different bottom friction schemes can be approximately 1 m. Therefore, to achieve the best wave simulations of SWAN wave model under actual sea conditions, it is necessary to consider the effects of these factors. |
| Key words: typhoon waves SWAN ROMS coupled model |
