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| 江苏辐射沙洲海区潮流对涌浪能量传播的影响 |
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冯曦1,2, 赵嘉静1,2, 冯卫兵1,2, 李慧超1,2
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1.海岸灾害及防护教育部重点实验室(河海大学), 江苏 南京 210098;2.河海大学 港口海岸与近海工程学院, 江苏 南京 210098
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| 摘要: |
| 为研究了江苏辐射沙洲地区潮流场对涌浪能量传播的影响，本文利用双向耦合的Delft3D-FLOW和SWAN模型进行了对江苏辐射沙洲地区风-浪-潮流的整体模拟。时间尺度，是表达波能传播速率的有量纲参数。本文利用时间尺度这一物理概念来描述涌浪的波能在地理空间和谱空间中的传播规律。时间尺度越小，波能的传播速率越快。研究发现，通过计算和对比波能的时间尺度在地理空间、谱空间内的变化规律，发现在辐射沙洲地区，波能时间尺度在谱空间内变化偏大。而在潮流影响下，涌浪的频率运移表现更明显。通过理想实验的对比，发现涌浪能量的时间尺度在有潮流明显较无潮流作用时变小，这反映了潮流对于涌浪能量的传递速率有正向作用。在地理空间上，波能的时间尺度在涨潮时刻减小，落潮时刻增大。 |
| 关键词: 潮流 涌浪 能量传播过程 时间尺度 辐射沙洲 |
| DOI：10.11759/hykx20190904001 |
| 分类号:TV139.2 |
| 基金项目:国家自然科学基金（51709091）；江苏省自然科学基金（BK20170874）；中央高校基金（2017B005） |
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| Effect of tidal currents on the progress of swell energy propagation in Jiangsu radial sand ridges |
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FENG Xi1,2, ZHAO Jia-jing1,2, FENG Wei-bing1,2, LI Hui-chao1,2
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1.Key Laboratory of Coastal Disaster and Defense, Ministry of Education, Hohai University, Nanjing 210098, China;2.College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
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| Abstract: |
| To study the effect of the tidal current on the process of swells in the Jiangsu radial sand ridges (JRSRs), a two-way coupled Delft3D-FLOW and SWAN modeling system was used to simulate wind-wave-tide triple interactions in the JRSRs. A time scale is a dimensional parameter that can express the wave energy transmission rate. Time scales were used to describe the propagation process of swell energy in geographical and spectral spaces. This study, by calculating and comparing the time scales of wave energies in geographical and spectral spaces in the JRSRs, found that the time scales of wave energy in the spectral space were larger than those in the geographic space. The tidal current has a significant influence on the frequency-shift of swells spectra. Through comparison experiments, the time scale was found to dramatically reduce when the tidal current was present. This finding indicates that tidal current had a positive influence on the transmission rate of swell energy. In the geographical space, the time scale of wave energy decreased during flooding tide and increased during ebbing. |
| Key words: tidal current swells the progress of the energy propagation time scale radial sand ridges |