Abiki oscillations in Sakitsu Bay, west Kyushu, Japan
Abiki oscillations in Sakitsu Bay, west Kyushu, Japan
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DOI：
10.1007/s11069-013-0959-5
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发表时间：
2014-10
期刊：
影响因子：
3.7
通讯作者：
Kenji Tanaka;Shinichiro Gohara;Takayuki Koga;R. Yamaguchi;F. Yamada
中科院分区：
文献类型：
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作者：
Kenji Tanaka;Shinichiro Gohara;Takayuki Koga;R. Yamaguchi;F. Yamada
日本九州西部阿马库萨的崎津湾和横久湾在2009年2月的“阿比希”事件中遭受了洪水破坏。两个海湾的振荡特性进行了调查，采取现场测量和进行数值试验，以减轻洪水的影响，在阿比基事件的洪水缓解。连续小波变换和带通滤波的压力和水位表明，一系列的压力扰动，小到1.0百帕，造成了大的放大振荡在崎津湾。当一系列海洋长波进入海湾时，早期阶段就形成了冲浪拍。随后，海平面开始经历大幅度振荡，并有一个周期约为24分钟的振荡的第二个高峰，在现场测量和数值试验中看到。由于周期为12 min的海浪的连续入射，在Yokaku湾形成了周期为12 min的波拍，但其波周期几乎是该湾自然周期的一半。这波浪拍可能以11.8分钟的自然周期进入崎津湾，引起了大的水位波动。
Sakitsu and Yokaku bays in Amakusa in west Kyushu, Japan, experienced inundation damage in the February 2009 meteotsunami (Abiki) event. The oscillation characteristics of both bays are investigated by taking field measurements and conducting numerical experiments with regard to flood mitigation with the aim to reduce the flood impact during Abiki events. A continuous wavelet transform and bandpass filtering both of the pressure and water level indicated that a sequence of pressure disturbances, as small as 1.0 hPa, caused the large amplified oscillation within Sakitsu Bay. When a sequence of ocean long waves entered the bay, a surf beat evolved in the early stages. Subsequently, the sea level began to undergo large amplitude oscillations, and there was a secondary peak of oscillation with a period of around 24 min, as seen in both field measurements and numerical experiments. A surf beat with the period of 12 min formed in Yokaku Bay owing to the continuous incidence of ocean waves with period of 12 min, but its wave period was almost half of that of the natural period of the bay. This surf beat may have entered Sakitsu Bay with natural period of 11.8 min and caused large water-level fluctuations.