Abnormal surges and the effects of the Seto Inland Sea circulation in Hiroshima Bay, Japan
The Seto Inland Sea (SIS) is the largest semienclosed coastal sea in Japan and has three connections with the outer seas. When a typhoon approached the SIS in September 2011, spatial variations of sea level elevation were observed across the SIS. Additionally, an unusual sea level rise (abnormal sur...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2024-03-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2024.1359288/full |
| _version_ | 1797255507524714496 |
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| author | Jae-Soon Jeong Han Soo Lee Han Soo Lee Nobuhito Mori Nobuhito Mori |
| author_facet | Jae-Soon Jeong Han Soo Lee Han Soo Lee Nobuhito Mori Nobuhito Mori |
| author_sort | Jae-Soon Jeong |
| collection | DOAJ |
| description | The Seto Inland Sea (SIS) is the largest semienclosed coastal sea in Japan and has three connections with the outer seas. When a typhoon approached the SIS in September 2011, spatial variations of sea level elevation were observed across the SIS. Additionally, an unusual sea level rise (abnormal surge) occurred in Hiroshima Bay approximately 8 days after the typhoon passed, with the Itsukushima Shrine in the bay flooded by the surge. To understand the mechanism of the abnormal surge in the bay and the relationship between sea level variations and circulation in the SIS, we investigated the 2011 event by applying a high-resolution numerical ocean circulation model using SCHISM with bias correction for sea surface heights (SSHs) at the open boundary. The overall easterly throughflow due to the west-high east-low SSH pattern in the SIS and temporary SSH disturbances due to typhoons were well reproduced in the model results. Among the three connections, the Bungo Channel mainly determined the overall net flux into the SIS and contributed significantly to sea level variations within the SIS. Additionally, the Kii Channel played more crucial roles in shaping the circulation and local sea level variations. The Kanmon Strait exhibited minor impacts. The abnormal tide in Hiroshima Bay was mainly attributed to seawater flux input from the outer seas, in conjunction with the subtidal internal seiche with the bay. The results will help us to further understand the physical processes of the ocean and establish evidence-based safety plans for reducing natural hazard damage. |
| first_indexed | 2024-04-24T22:06:57Z |
| format | Article |
| id | doaj.art-7f4d3785553b478eb32156b0fb69fb74 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-24T22:06:57Z |
| publishDate | 2024-03-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-7f4d3785553b478eb32156b0fb69fb742024-03-20T11:29:44ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452024-03-011110.3389/fmars.2024.13592881359288Abnormal surges and the effects of the Seto Inland Sea circulation in Hiroshima Bay, JapanJae-Soon Jeong0Han Soo Lee1Han Soo Lee2Nobuhito Mori3Nobuhito Mori4Coastal Hazards and Energy System Science Lab, Transdisciplinary Science and Engineering Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, JapanCoastal Hazards and Energy System Science Lab, Transdisciplinary Science and Engineering Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, JapanCenter for Planetary Health and Innovation Science (PHIS), The IDEC Institute, Hiroshima University, Hiroshima, JapanDisaster Prevention Research Institute, Kyoto University, Kyoto, JapanDepartment of Engineering, Swansea University, Swansea, United KingdomThe Seto Inland Sea (SIS) is the largest semienclosed coastal sea in Japan and has three connections with the outer seas. When a typhoon approached the SIS in September 2011, spatial variations of sea level elevation were observed across the SIS. Additionally, an unusual sea level rise (abnormal surge) occurred in Hiroshima Bay approximately 8 days after the typhoon passed, with the Itsukushima Shrine in the bay flooded by the surge. To understand the mechanism of the abnormal surge in the bay and the relationship between sea level variations and circulation in the SIS, we investigated the 2011 event by applying a high-resolution numerical ocean circulation model using SCHISM with bias correction for sea surface heights (SSHs) at the open boundary. The overall easterly throughflow due to the west-high east-low SSH pattern in the SIS and temporary SSH disturbances due to typhoons were well reproduced in the model results. Among the three connections, the Bungo Channel mainly determined the overall net flux into the SIS and contributed significantly to sea level variations within the SIS. Additionally, the Kii Channel played more crucial roles in shaping the circulation and local sea level variations. The Kanmon Strait exhibited minor impacts. The abnormal tide in Hiroshima Bay was mainly attributed to seawater flux input from the outer seas, in conjunction with the subtidal internal seiche with the bay. The results will help us to further understand the physical processes of the ocean and establish evidence-based safety plans for reducing natural hazard damage.https://www.frontiersin.org/articles/10.3389/fmars.2024.1359288/fullabnormal tidesnet flux analysisinternal seichehigh-resolution seamless modelingschism |
| spellingShingle | Jae-Soon Jeong Han Soo Lee Han Soo Lee Nobuhito Mori Nobuhito Mori Abnormal surges and the effects of the Seto Inland Sea circulation in Hiroshima Bay, Japan Frontiers in Marine Science abnormal tides net flux analysis internal seiche high-resolution seamless modeling schism |
| title | Abnormal surges and the effects of the Seto Inland Sea circulation in Hiroshima Bay, Japan |
| title_full | Abnormal surges and the effects of the Seto Inland Sea circulation in Hiroshima Bay, Japan |
| title_fullStr | Abnormal surges and the effects of the Seto Inland Sea circulation in Hiroshima Bay, Japan |
| title_full_unstemmed | Abnormal surges and the effects of the Seto Inland Sea circulation in Hiroshima Bay, Japan |
| title_short | Abnormal surges and the effects of the Seto Inland Sea circulation in Hiroshima Bay, Japan |
| title_sort | abnormal surges and the effects of the seto inland sea circulation in hiroshima bay japan |
| topic | abnormal tides net flux analysis internal seiche high-resolution seamless modeling schism |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2024.1359288/full |
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