Tide-Surge Interaction in the Pearl River Estuary: A Case Study of Typhoon Hato
Tide-Surge Interaction in the Pearl River Estuary: A Case Study of Typhoon Hato
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DOI：
10.3389/fmars.2020.00236
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
P. Zheng;Ming Li;Caixia Wang;J. Wolf;Xue'en Chen;M. De Dominicis;P. Yao;Zhan Hu
中科院分区：
文献类型：
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作者：
P. Zheng;Ming Li;Caixia Wang;J. Wolf;Xue'en Chen;M. De Dominicis;P. Yao;Zhan Hu
利用三维近岸水动力模型，对2017年8月台风"天鸽"期间珠江口潮波相互作用的特征和机制进行了详细研究。首次将Holland参数化热带气旋模式结果与CFSR再分析资料融合，重建了台风Hato的风场，使模式能够较好地再现纯天文潮和风暴潮，特别是捕捉到了台风经过时实测水位的独特振荡模式。为了区分天文潮、风暴潮和潮波相互作用对珠江口水位的影响，进行了三种不同类型的模型试验。结果表明，除了潮汐调制效应外，风暴潮对涌浪位也有很强的调制作用，涌浪相位的改变也会改变风暴潮的峰值潮位。为了数值评估三个非线性过程在潮涌相互作用中的贡献，并量化它们的相对重要性，在这项研究中，广泛使用的"减法"的方法和一个新的"加法"的方法进行了测试。由于"再平衡"效应的影响，目前广泛采用的"减法"方法不适用于评估，因此提出了新的"加法"方法，并引入了一个新的指标来表征潮涌相互作用，从而得到了更合理的结果。采用"加法"方法进行的详细分析表明，二次底摩擦、浅水效应和非线性平流效应分别在河口潮涌相互作用中起着第一、第二和第三重要作用。
In this study, the characteristics and mechanisms of tide-surge interaction in the Pearl River Estuary (PRE) during Typhoon Hato in August 2017 are studied in detail using a 3D nearshore hydrodynamic model. The wind field of Typhoon Hato is firstly reconstructed by merging the Holland parametric tropical cyclone model results with the CFSR reanalysis data, which enables the model to reproduce the pure astronomical tides and storm tides well; in particular, the distinctive oscillation pattern in the measured water levels due to the passage of the typhoon has been captured. Three different types of model runs are conducted in order to separate the water level variations due to the astronomical tide, storm surge, and tide-surge interactions in the Pearl River Estuary. The results show the strong tidal modulation of the surge level, as well as alteration of the phase of surge, which also changes the peak storm tidal level, in addition to the tidal modulation effects. In order to numerically assess the contributions of three non-linear processes in the tide-surge interaction and quantify their relative significance, the widely used “subtraction” approach and a new “addition” approach are tested in this study. The widely used “subtraction” approach is found to be unsuitable for the assessment due to the “rebalance” effect, and thus the new “addition” approach is proposed along with a new indicator to represent the tide-surge interaction, from which more reasonable results are obtained. Detailed analysis using the “addition” approach indicates that the quadratic bottom friction, shallow water effect, and nonlinear advective effect play the first, second, and third most important roles in the tidal-surge interaction in the estuary, respectively.