DOI: 10.1029/2017JC013626
Scopus记录号: 2-s2.0-85046029009
论文题名: Tsunami Waves and Tsunami-Induced Natural Oscillations Determined by HF Radar in Ise Bay, Japan
作者: Toguchi Y. ; Fujii S. ; Hinata H.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 4 起始页码: 2965
结束页码: 2980
语种: 英语
英文关键词: high-frequency radar
; natural oscillations
; Tohoku tsunami
; tsunami current
Scopus关键词: eigenvalue
; empirical orthogonal function analysis
; frequency analysis
; gauge
; oceanic current
; oscillating flow
; physical property
; radar
; radial flow
; spectral analysis
; Tohoku earthquake 2011
; tsunami
; Honshu
; Ise Bay
; Japan
英文摘要: Tsunami waves and the subsequent natural oscillations generated by the 2011 Tohoku earthquake were observed by two high-frequency (HF) radars and four tidal gauge records in Ise Bay. The radial velocity components of both records increased abruptly at approximately 17:00 (JST) and continued for more than 24 h. This indicated that natural oscillations followed the tsunami in Ise Bay. The spectral analyses showed that the tsunami wave arrivals had periods of 16–19, 30–40, 60–90, and 120–140 min. The three longest periods were remarkably amplified. Time-frequency analysis also showed the energy increase and duration of these periods. We used an Empirical Orthogonal Function (EOF) to analyze the total velocity of the currents to find the underlying oscillation patterns in the three longest periods. To verify the physical properties of the EOF analysis results, we calculated the oscillation modes in Ise Bay using a numerical model proposed by Loomis. The results of EOF analysis showed that the oscillation modes of 120–140 and 60–90 min period bands were distributed widely, whereas the oscillation mode of the 30–40 min period band was distributed locally. The EOF spatial patterns of each period showed good agreement with the eigenmodes calculated by the method of Loomis (1975). Thus, the HF radars were capable of observing the tsunami arrival and the subsequent oscillations. © 2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114131
Appears in Collections: 气候减缓与适应
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作者单位: Graduate School of Engineering and Science, Department of Interdisciplinary Intelligent Systems Engineering, University of the Ryukyus, Nishihara, Japan; Department of Electrical and Electronics Engineering, University of the Ryukyus, Nishihara, Japan; Department of Civil and Environmental Engineering, Ehime University, Matsuyama, Japan
Recommended Citation:
Toguchi Y.,Fujii S.,Hinata H.. Tsunami Waves and Tsunami-Induced Natural Oscillations Determined by HF Radar in Ise Bay, Japan[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(4)