Study on Influences of Fringing Reef on Harbor Oscillations Triggered by N-Waves

Study on Influences of Fringing Reef on Harbor Oscillations Triggered by N-Waves
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岸礁对N波引发的港口振荡影响研究

DOI:
10.1007/s13344-021-0036-x
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发表时间:
2021-07
影响因子:
1.6
通讯作者:
Liu Qian
Liu Qian
中科院分区:
工程技术2区
文献类型:
--
作者:
Gao Junliang;Chen Hongzhou;Ma Xiaozhou;Dong Guohai;Zang Jun;Liu Qian

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首次研究了岸礁地形变化对不同幅值和波形的N波入射港内振荡的影响。本文用Boussinesq型数值模式FUNWAVE-TVD模拟了N波在礁石上的传播及由此引起的港口振荡。研究了礁面平面坡度、礁面剖面形状和泻湖宽度对港内最大爬高、波能分布和总波能的影响。结果表明,随着礁面坡度的减小,波能分布均匀性和总波能均逐渐增大。礁面剖面形状对前缘-仰角N波(LEN波)的能量分布均匀性影响不大,而前缘-低潮N波(LDN波)的能量分布均匀性随礁面平均水深的增加而逐渐减小。总波能随礁面平均水深的增加先增大后减小。总体而言,无论礁面宽度和入射波形类型如何,总波能随泻湖宽度先急剧减小后略有增加。LEN波作用下的最大爬高随泻湖宽度单调减小。而对于LDN波,其随泻湖宽度的变化趋势依赖于入射波的振幅。
Influences of topographic variations of the offshore fringing reef on the harbor oscillations excited by incident Nwaves with different amplitudes and waveform types are studied for the first time. Both the propagation of the Nwaves over the reef and the subsequently-induced harbor oscillations are simulated by a Boussinesq-type numerical model, FUNWAVE-TVD. The present study concentrates on revealing the influences of the plane reef-face slope, the reef-face profile shape and the lagoon width on the maximum runup, the wave energy distribution and the total wave energy within the harbor. It shows that both the wave energy distribution uniformity and the total wave energy gradually increase with decreasing reef-face slope. The profile shape of the reef face suffering leading-elevation Nwaves (LEN waves) has a negligible impact on the wave energy distribution uniformity, while for leading-depression N-waves (LDN waves), the latter gradually decreases with the mean water depth over the reef face. The total wave energy always first increases and then decreases with the mean water depth over the reef face. In general, the total wave energy first sharply decreases and then slightly increases with the lagoon width, regardless of the reef-face width and the incident waveform type. The maximum runup subjected to the LEN waves decreases monotonously with the lagoon width. However, for the LDN waves, its changing trend with the lagoon width relies on the incident wave amplitude.
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影响因子: 1.6
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