Inverse estimation of bottom topography using tide observation data

• Project/Area Number: 16K13883
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Kyushu University
• Principal Investigator: HIROSE NAOKI 九州大学, 応用力学研究所, 教授 (70335983)
• Research Collaborator: Uehara Katsuto
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 海底地形 / 黄海 / 浅水波モデル / モデルグリーン関数 / 対馬海峡 / 対馬暖流 / 、海洋物理・陸水学

Outline of Final Research Achievements

The area-mean depth for the Yellow Sea was accurately estimated within the narrow range between 44.9 and 45.7m by the inverse calculation of ocean tide model with the constraint of satellite altimeter data. But the estimation results were unstable using coastal tide gauge data.
Numerical experiments were performed for the sensitivity of the fluid motion to various bumps and dimples using a shallow water model with a simple channel topography. The maximum sensitivity was found at the top of the bump (dimple) with the oscillating case but shifted left (right) hand side of the bump(dimple) with the steady flow. The response to the topographic anomaly was stronger with the steady flow.

Academic Significance and Societal Importance of the Research Achievements

本研究が進化することによって水深マップの信頼性が向上し、船舶の航行や漁業活動、資源調査、港湾整備など実社会で直接的に有益である。海底地形データの精度向上は、特に沿岸域の海況予測の計算精度にも直結し、気象予報や海洋エネルギーなどさらに多分野への波及効果が想像できる。

Research Products

• [Journal Article] The role of topographically induced form drag on the channel flows through the East/Japan Sea (2018)
  • Author(s): Sooyeon HAN, Naoki Hirose and Shinichiro Kida
  • Journal Title: Journal of Geophysical Research: Oceans Volume: 123, 9 Issue: 9 Pages: 6091-6105
  • DOI: 10.1029/2018jc013903
  • Peer Reviewed
• [Journal Article] High-resolution modeling of the Kuroshio current power south of Japan (2018)
  • Author(s): Tianran Liu, Bin Wang, Naoki Hirose, Toru Yamashiro, Hiroshi Yamada
  • Journal Title: Journal of Ocean Engineering and Marine Energy Volume: 4 Issue: 1 Pages: 37-55
  • DOI: 10.1007/s40722-017-0103-9
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Numerical simulation of the abrupt occurrence of strong current in the southeastern Japan Sea (2017)
  • Author(s): Naoki HIROSE, Yutaka KUMAKI, Atsushi KANEDA, Kouta AYUKAWA, Noriyuki OKEI, Satoshi IKEDA, Yosuke IGETA, Tatsuro WATANBE
  • Journal Title: Continental Shelf Research Volume: 143 Pages: 194-205
  • DOI: 10.1016/j.csr.2016.07.005
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Overview of physical oceanography research in Japan (2019)
  • Author(s): Naoki HIROSE
  • Organizer: 20th Pacific-Asian Marginal Seas meeting (PAMS 2019)
  • Int'l Joint Research / Invited
• [Presentation] 対馬海峡横断フェリーの航路と通過流量の再推定 (2018)
  • Author(s): 内海 勇哉, 高山 勝巳, 広瀬 直毅
  • Organizer: 日本海洋学会2018年度秋季大会
• [Presentation] Re-estimation of the volume transport with least-square fitting of Camellia lines (2018)
  • Author(s): Yuya Utsumi, Katsumi Takayama, and Naoki Hirose
  • Organizer: The 15th Korea-Japan (Japan-Korea) Joint Seminar in the Ocean and the Atmosphere
• [Presentation] 海底地形の逆推定に関する取り組み (2018)
  • Author(s): 広瀬 直毅
  • Organizer: 微細規模から惑星規模にかけての海洋力学過程と規模間相互作用の研究
• [Presentation] 海底地形が海流の流れに与える影響 (2018)
  • Author(s): 高原 淳史, 広瀬 直毅
  • Organizer: 日本海洋学会2018年度秋季大会
• [Presentation] Topographically induced form drag on the channel flow through the East/Japan Sea (2018)
  • Author(s): Sooyeon HAN, Naoki Hirose and Shinichiro Kida
  • Organizer: 2018 Ocean Sciences Meeting, Portland, U.S.A.
  • Int'l Joint Research
• [Presentation] Periodic corrections of major parameters of a coastal ocean model using approximate Green's functions (2018)
  • Author(s): Naoki Hirose
  • Organizer: 2018 Ocean Sciences Meeting, Portland, U.S.A.
  • Int'l Joint Research
• [Presentation] Volume transport trough the Korea Strait Estimated from Sea Level Difference and Current Data (2017)
  • Author(s): Hong-Ryeol Shin, Jihoon Lee, Kwangwoo Cho, Tetsutaro Takikawa, Naoki HIROSE
  • Organizer: 19th Pacific Asian Marginal Seas Meeting
  • Int'l Joint Research
• [Presentation] The East/Japan Sea throughflow controlled by form drag of the Tsugaru Strait (2017)
  • Author(s): Sooyeon HAN, Naoki HIROSE
  • Organizer: 19th Pacific Asian Marginal Seas Meeting
  • Int'l Joint Research
• [Presentation] Coastal Ocean data assimilation experiment interacting with local fisheries (2017)
  • Author(s): Naoki HIROSE
  • Organizer: 19th Pacific Asian Marginal Seas Meeting
  • Int'l Joint Research
• [Presentation] 海峡力学過程の統合と解剖 (2017)
  • Author(s): 広瀬 直毅
  • Organizer: RIAMフォーラム
• [Presentation] Effect of form drag on the channel flow in the East/Japan Sea (2017)
  • Author(s): 韓 修妍, 広瀬 直毅
  • Organizer: 北海道大学低温科学研究所研究集会 「宗谷暖流を始めとし た対馬暖流系の変動メカニズム」
• [Presentation] 海峡通過流のデータ同化へ向けて (2017)
  • Author(s): 広瀬 直毅, 韓 修妍, 上原 克人, 滝川哲太郎, 吉川裕
  • Organizer: 北海道大学低温科学研究所研究集会 「宗谷暖流を始めとし た対馬暖流系の変動メカニズム」
• [Presentation] The role of topographically induced drag on the channel flow through the Japan Sea (2017)
  • Author(s): 韓 修妍, 広瀬 直毅, 木田 新一郎
  • Organizer: 日本海洋学会２０１７年度秋季大会，仙台
• [Presentation] 黒潮と対馬暖流の高分解能モデリングから分かったこと (2017)
  • Author(s): 広瀬直毅・韓修妍・劉天然
  • Organizer: 九州大学応用力学研究所研究会「海洋大循環の力学-エクマン層から中深層循環迄」
• [Presentation] 津軽海峡の過大なモデル流量を修正する方法 (2016)
  • Author(s): 広瀬 直毅, 韓 修妍
  • Organizer: 九州大学応用力学研究所共同利用研究集会「日本海及び日本周辺海域の海況モニタリングと波浪計測に関する研究集会」
  • Place of Presentation: 九州大学応用力学研究所（福岡県春日市）
  • Year and Date: 2016-12-15
• [Presentation] 日本海沿岸帯域海況予測モデルの西方拡大 (2016)
  • Author(s): 広瀬 直毅
  • Organizer: 日本海及び日本周辺海域における環境急変現象（急潮）のモニタリング、モデリング及びメカニズム解明に関する研究集会
  • Place of Presentation: 九州大学応用力学研究所（福岡県春日市）
  • Year and Date: 2016-08-04
• [Presentation] Finite volume modeling of channel transports for the East/Japan Sea (2016)
  • Author(s): Sooyeon Han, Naoki Hirose
  • Organizer: 低温研共同利用研究集会 「宗谷暖流を始めとした対馬暖流系の変動メカニズム」
  • Place of Presentation: 北海道大学低温研究所（北海道札幌市）
  • Year and Date: 2016-07-01
• [Presentation] Internal tide-induced enhancement of the Korea Strait Bottom Cold Water intrusion (2016)
  • Author(s): ae-Hun Park, Ye Sol Kim, Ho Jin Lee, Hee-Yeol Lee, Ho Kyung Ha, Young-Gyu Park, Chanhyung Jeon, Naoki Hirose
  • Organizer: 低温研共同利用研究集会 「宗谷暖流を始めとした対馬暖流系の変動メカニズム」
  • Place of Presentation: 北海道大学低温研究所（北海道札幌市）
  • Year and Date: 2016-07-01
• [Presentation] 海峡力学過程の統合と解剖に関する研究計画 (2016)
  • Author(s): 広瀬 直毅
  • Organizer: 低温研共同利用研究集会 「宗谷暖流を始めとした対馬暖流系の変動メカニズム」
  • Place of Presentation: 北海道大学低温研究所（北海道札幌市）
  • Year and Date: 2016-06-30