Proposal of new indexes for development characteristics of storm surge considering topographical features and tides
Proposal of new indexes for development characteristics of storm surge considering topographical features and tides
复制标题
考虑地形特征和潮汐的风暴潮发展特征新指标的提出
DOI：
10.1080/21664250.2021.1883292
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发表时间：
2021
影响因子：
2.4
通讯作者：
Hashimoto Noriaki
中科院分区：
文献类型：
--
作者：
Ide Yoshihiko;Yamashiro Masaru;Hashimoto Noriaki
我们重点研究了潮汐对风暴潮偏差的影响。根据以前的研究，风暴潮偏差取决于台风在潮汐阶段来袭的时间，因为海湾的水深随潮汐而变化。以往的研究认为，这种依赖关系可以用传统的公式来解释。然而，我们的数值模拟结果不能用传统的公式来定量解释，需要一个公式中没有表达的风暴潮的发展机制来解释这种相关性。因此，我们把重点放在水深梯度上，并从数值模拟结果中证实了水深梯度对风暴潮的发育特征有很大的影响。此外，还推导了考虑深度梯度的新公式，并对风暴潮偏差的潮汐相关性进行了研究。在新公式的基础上，导出了反映水深梯度和潮汐对风暴潮影响的两个指标。我们对这些指标进行了检查，以清楚地了解风暴潮的发展特征。最后，通过将基于该指标计算的涌浪高度与数值模拟结果进行比较，验证了该指标的有效性。
We focused on the effects of tides on storm surge deviations. According to previous studies, storm surge deviations depend on when the typhoon strikes in the tidal phase because the water depth of a bay varies with tides. The previous studies concluded that the dependence can be explained by the conventional formula. However, the results of our numerical simulations could not be explained quantitatively by the conventional formula and require a development mechanism for storm surges that are not expressed in the formula, to explain the dependency. Therefore, we focused on the water depth gradient, and confirmed from the numerical simulation results that the depth gradient greatly influenced the development characteristics of storm surges. Moreover, a new formula considering the depth gradient was derived, and the tidal dependence of storm surge deviations was investigated. Based on the new formula, two indexes that indicate the effect of the water depth gradient and the effect of tides on storm surges were derived. We examined the indexes to clearly understand the development characteristics of storm surges. Finally, the validity of the derived indexes was investigated by comparing the computed surge heights based on the indexes with the results of the numerical simulations.