Abstract

The analysis of the results of numerical hydrodynamic modeling of water level and current fluctuations of the Baltic Sea in the periods of floods in the Finland and Riga gulfs is carried out. It is shown that due to the considerable isolation of the sea a great influence on the dynamics of flood waves have the processes they reflect, resulting in a generated progressive-standing waves. During a especially dangerous sea level rise on January 9, 2005, the flood wave had a period of about 40–42 hours. This period turned out to be close to the 41-hour period of the Baltic Sea, distinguished on the basis of an analysis of the results of numerical hydrodynamic modeling of free Baltic Sea level oscillations. The spatial structure of the level field for eigenoscillations with a period of 41 hours allows them to be identified as multinodal progressive-standing waves, characterized by a large number of amphidromic systems and antinodes. One of the most pronounced antinodes of eigenoscillations with a period of 41 hours is in the Neva Bay of the Gulf of Finland.

中文翻译：

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涅瓦河洪水波的空间结构和传播

摘要

对芬兰和里加湾发生洪灾期间波罗的海的水位和水流波动进行数值水动力建模的结果进行了分析。结果表明，由于海洋的隔绝，对洪水波的动力学影响很大，它们反映了它们的过程，从而产生了渐进式驻波。在2005年1月9日特别危险的海平面上升期间，洪水波的持续时间约为40-42小时。事实证明，这一时期接近波罗的海的41小时时期，这是根据对自由波罗的海水位振荡的数值流体动力学模拟结果的分析而得出的。特征振荡的水平场的空间结构为41小时，可以将它们识别为多节点渐进式驻波，其特征是具有大量的两性系统和波腹。特征振荡最明显的波腹数为41小时，位于芬兰湾的内娃湾。