| 摘要: |
| 针对三门湾这一典型半封闭海湾，分别从理论推导和数值模拟两方面研究了三门湾的共振周期。研究发现：理论推导结果可以用于对海湾整体共振周期的粗略估计，数值模拟结果更加精确，也能充分反映海湾内不同水域的共振特征。数值模拟结果表明三门湾内各水域普遍存在3~4个共振周期模态，湾内各水道第一模态和第三模态共振周期数值解与理论值较为接近，石浦水道由于与外海相联通，共振周期不显著。三门湾内各水域共振周期第一模态对应的振幅最大，然后依次递减，但湾顶的青山港、蛇蟠水道第二模态共振周期及对应的振幅值与第一模态相差较小，基本呈现双峰结构。共振振幅由湾外向三门湾顶部逐渐增加，尤其是湾顶处振幅增益比较显著。 |
| 关键词: 半封闭海湾 共振 理论推导 数值模拟 |
| DOI：10.11759/hykx20170311001 |
| 分类号:P731.23 |
| 基金项目:广东海洋大学近海海洋变化与灾害重点实验室开放基金(GLOD1405)； |
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| Calculation and study of resonant period in semi-closed Bay |
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Yang Wan-kang,Yi Xiao-fei and Chen Zhong-biao
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Key Laboratory of Engineering Oceanography,the Second Institute of Oceanography,State Oceanic Administration,College of Ocean and Meteorology,Guangdong Ocean University,College of marine science,Nanjing University of Information Science and TechnologyS
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| Abstract: |
| Aiming at the typical semi–closedSanmen Bay, the resonance period is studied by theoretical formula derivation and numerical simulation. It is found that the theoretical formula can be used to estimate theresonance period of the bay, and the numerical simulation results are more accurate and reasonable, because the difference of the resonance characteristics of the waters in the bay can be described in detail. The numerical results show that there are 4-5 resonant period modes in theSanmen Bay, and the numerical simulation solution of the first modal and third modal resonance periods is close to the theoretical value. The Shipu waterway is connected with the offshore, so the resonance period is not significant. The first mode amplitudeof the resonance period is the largest and then decrease with increasing mode, but there is a very small difference between the first modeand second model for the period and amplitude value from the Qingshan port and Shepan waterway, which showeda bimodal structure. The resonant amplitude gain is gradually increased from outside of the bay to inside, especially significant at the top of bay. |
| Key words: semi-closed bay resonance theoretical derivation numerical simulation |