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Research and development of the radar system for monitoring the variability of surface current in coastal and strait areas

Research Project

Project/Area Number 17340141
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionKyushu University

Principal Investigator

MASUDA Akira  Kyushu University, Research Institute for Applied Mechanics, Professor (60091401)

Co-Investigator(Kenkyū-buntansha) YOSHIKAWA Yutaka  KYUSHU UNIVERSITY, Research Institute for Applied Mechanics, Associate Professor (40346854)
Project Period (FY) 2005 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥15,610,000 (Direct Cost: ¥14,800,000、Indirect Cost: ¥810,000)
Fiscal Year 2007: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2006: ¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 2005: ¥7,900,000 (Direct Cost: ¥7,900,000)
KeywordsHF radar / ADCP / interpolation / estimation / tidal current / drift current / Tsushima Eddy / seasonal variation / curvilinear coordinates / 海面境界層 / エクマン層 / 方位検出改良手順
Research Abstract

1. Developing the current monitoring system based on HF radar and the methods for analyzing the data obtained by that system.
Radar measurement often suffers from its limited accuracy and insufficient number of data. Moreover HF radar fails to measure the current sometimes in some part of the observation area. We therefore developed general methods for interpolating and estimating the current field with application to HF radar measurement in mind. 1) The standard analysis used when 2 units of radar are available is generalized to the case of an arbitrary number of radar units in a single area. 2) The harmonic interpolation method was developed, which proved quite simple, robust and useful. 3) The harmonic interpolation method was generalized to the least square method with harmonic interpolation. 4) Hydro-dynamical meaning was given to the harmonic interpolation method. 5) Useful representation was derived for general orthogonal curvilinear coordinates, including the polar coordinate sy … More stem used in HF radar measurement.
2. Oceanography on the variability of the surface current in the Tsushima Strait revealed by HF radar.
2.1) Our radar system often detected the Tsushima Eddy, east of Tsushima. It is a sub-mesoscale anti-clockwise eddy of the same size as Tsushima. We analyzed the spatial and temporal properties of Tsushima Eddies on the basis of the accumulated data obtained by HF radar. Strong and notable Tsushima Eddies tend to be generated in summer to autumn. They are likely to be born at intervals of 4-6 days or 10-12 days. They seem to be shed at the southeastern tip of Tsushima, drifting northeastward. These results suggested that the generation of Tsushima Eddies is controlled by the intensity of the Tsushima Warm Current, the fortnightly cycle of the spring-neap tide and seasonal variation of the density stratification; the Tsushima Eddies are found in the wake of Tsushima against the northward flowing Tsushima Current with relatively strong alternating tidal current superimposed.
2.2) We analyzed the seasonal variation of the surface current in the Tsushima Strait on the basis of the accumulated current maps of the monthly mean current field obtained by the HF radar system. In summer, southwestward flowing counter current appears east of Tsushima. In winter surface current in the eastern channel of Tsushima Strait seems to flow southeastward to Fukuoka, a curious result Substantial current becomes visible, however, if the wind-drift current estimated adequately is eliminated from monthly mean current; .seemingly southeastward surface current in winter is mostly ascribed to the wind-drift component due to monsoon. On the other hand from summer to autumn, frequent generation of Tsushima Eddies, east of Tsushima, was confirmed as was described in 2.1) It is suggested therefore that the southwestward mean counter current east of Tsushima in summer represents the average of definitely anti-clockwise eddies (Tsushima Eddies) activated in the eastern wake of Tsushima in summer. Less

Report

(4 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (40 results)

All 2008 2007 2006 2005 Other

All Journal Article (23 results) (of which Peer Reviewed: 5 results) Presentation (16 results) Remarks (1 results)

  • [Journal Article] 対馬海峡東水道に見られる反時計回り渦の変動特性2008

    • Author(s)
      中園 隆司, 吉川 裕, 増田 章, 丸林 賢次, 石橋 道芳
    • Journal Title

      九州大学応用力学研究所所報 134

      Pages: 47-52

    • NAID

      120001219843

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Journal Article] 海況観測で使う補間・推定法に関する覚書-とくに海洋レーダーについて-2008

    • Author(s)
      増田 章
    • Journal Title

      九州大学応用力学研究所所報 134

      Pages: 29-45

    • NAID

      40016147142

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Journal Article] 海表面の流れと漂着物移動のメカニズム2008

    • Author(s)
      吉川 裕
    • Journal Title

      沿岸海洋研究 45

      Pages: 91-96

    • NAID

      110007611184

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Spatial and Temporal Variations of Anti-Clockwise Eddy Formed In the Eastern Channel of the Tsushima Strait2008

    • Author(s)
      Nakazono., R Y., Yoshikawa, A., Masuda, K., Marubayashi, M., Ishibashi
    • Journal Title

      Reports of Research Institute for Applied Mechanics Vol. 134

      Pages: 47-52

    • NAID

      120001219843

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] A Note on Some Basic Methods of Interpolation and Estimation in Particular for onitoring Ocean Current by HF Radar2008

    • Author(s)
      Masuda, A
    • Journal Title

      Reports of Research Institute for Applied Mechanics Vol. 134

      Pages: 29-45

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Mechanism of Sea-Surface Currents and Drifting-Object Behavior2008

    • Author(s)
      Yoshikawa, Y
    • Journal Title

      Mechanism of Sea-Surface Currents and Drifting-Object Behavior Vol. 45, No. 2

      Pages: 91-96

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] A surface velocity spiral observed with ADCP and HF radar in the Tsushima Strait2007

    • Author(s)
      Yoshikawa, Y., T.Matsuno, K.Marubayashi, K.Fukudome
    • Journal Title

      Journal of Geophysical Research Oceans 112

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] 漂流ブイと海洋レーダーを用いた対馬海峡における表層収束・発散場の評価2007

    • Author(s)
      石井 大輔, 柳 哲雄, 吉川 裕, 増田 章
    • Journal Title

      海の研究 16

      Pages: 237-251

    • NAID

      110006274435

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] A Surfcae Velocity Spiral Observed with ADCP and HF Radar in the Tsushima Strait2007

    • Author(s)
      Yoshikawa., Y, T., Matsuno, K., Marubayashi, K., Fukumori
    • Journal Title

      Journal of Geophysical Research Vol. 112

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Estimation of Divergence/Convergence Observed with GPS Drifting Buoys and Ocean Radars in the Tsushima Strait2007

    • Author(s)
      D., Ishii, T., Yanagi, Y., Yoshikawa, A., Masuda
    • Journal Title

      Oceanography in Japan Vol. 13, No. 3

      Pages: 237-251

    • NAID

      110006274435

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] A surface velocity spiral observed with ADCP and HF radar in the Tsushima Strait2007

    • Author(s)
      Yoshikawa, Y., T. Matsuno, K. Marubayashi, K. Fukudome.
    • Journal Title

      Journal of Geophysical Research-Oceans 112

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 漂流ブイと海洋レーダーを用いた対馬海峡における表層収束・発散場の評価2007

    • Author(s)
      石井 大輔, 柳哲 雄, 吉川 裕, 増田 章
    • Journal Title

      海の研究 16

      Pages: 237-251

    • NAID

      110006274435

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 流軸の揺れで生じる流軸に平行な向きの渦成海水輸送2007

    • Author(s)
      増田 章
    • Journal Title

      九州大学応用力学研究所所報 123号

      Pages: 37-53

    • NAID

      120005306706

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 表層流・潮汐に関する覚書 -海洋レーダー観測に関連して-2007

    • Author(s)
      増田 章
    • Journal Title

      九州大学応用力学研究所所報 123号

      Pages: 55-74

    • NAID

      120005306707

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Intermadiate water formation at the Japan/East Sea subpolar front2006

    • Author(s)
      Lee, C.M., L.N.Thomas, Y.Yoshikawa
    • Journal Title

      Oceanography 19

      Pages: 110-121

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 波浪の波高統計 -低次非線形性を有する純確立摸型と風洞実験2006

    • Author(s)
      古川那津恵, 増田章, 石橋道芳
    • Journal Title

      日本流体力学会誌「流れ」 25巻別冊

      Pages: 104-104

    • Related Report
      2006 Annual Research Report
  • [Journal Article] On the accuracy of HF radar measurement in the Tsushima Strait2006

    • Author(s)
      Yoshikawa, Y., A.Masuda, K.Marubayashi, M.Ishibashi
    • Journal Title

      Journal of Geophysical Research 111, No.C04009

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 短波レーダーにより観測された対馬海峡の潮流2005

    • Author(s)
      奥野章, 吉川裕, 増田章, 丸林賢次, 石橋道芳
    • Journal Title

      九州大学総合理工学報告 Vol.27, No.1

      Pages: 9-19

    • NAID

      120001944223

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Parameterization for C02 transfer velocity at the surface of wind waves2005

    • Author(s)
      H.Tsumori, T.Sugihara, A.Masuda
    • Journal Title

      J.Hydroscience and Hydraulic Engineering Vol.23,No.1

      Pages: 43-55

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 風波気液界面における二酸化炭素交換速度の評価に関する実験的研究2005

    • Author(s)
      津守博通, 杉原裕司, 増田章
    • Journal Title

      土木学会論文集 No.782/11-70

      Pages: 101-116

    • NAID

      10013815507

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Imaging measurement of whitecaps at the sea observation tower2005

    • Author(s)
      T.Sugihara, H.Tsumori, H.Yosioka, S.Serizawa, A.Masuda
    • Journal Title

      Proc.29^<th> Conf.Coastal Engineering 2004 Vol.1

      Pages: 1082-1092

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 対馬海峡に設置されたHFレーダーの計測精度再検証2005

    • Author(s)
      吉川裕, 増田章, 丸林賢次, 石橋道芳, 奥野章
    • Journal Title

      沿岸海洋研究 Vol.43, No.1

      Pages: 69-75

    • NAID

      110007999348

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 日本海深層流の形成機構に関する数値実験2005

    • Author(s)
      吉川 裕
    • Journal Title

      ながれ Vol.24 別冊

      Pages: 174-174

    • NAID

      120001944218

    • Related Report
      2005 Annual Research Report
  • [Presentation] 海洋中層の遅い蠕動状傾圧応答を曲線座標で表現する2008

    • Author(s)
      増田 章
    • Organizer
      日本海洋学会
    • Place of Presentation
      東京
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] A surface current measurement and interior current estimation Using HF radar2008

    • Author(s)
      Yoshikawa, Y., A.Masuda
    • Organizer
      Ocean Sciences Meeting 2008
    • Place of Presentation
      Orland, USA
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] Representation of Slow Baroclinic Response of Intermediate Layers by Orthogonal Curvilinear Coordinates2008

    • Author(s)
      Masuda, A.
    • Organizer
      Meeting of the Oceanographic Society of Japan
    • Place of Presentation
      Tokyo, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A Surface Current Measurement and Interior Current Estimation Using HF Radar2008

    • Author(s)
      Yoshikawa., Y., A., Masuda
    • Organizer
      Ocean Sciences Meeting 2008
    • Place of Presentation
      Orland, USA.
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Now and Future of the Surface Current Monitoring System based on HF Radar2008

    • Author(s)
      Yoshikawa., Y
    • Organizer
      Committee meeting for the Development of the Ocean Platform Engineering
    • Place of Presentation
      Fukuoka, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Seasonal Variations of Surface Currents and Estimated Interior Currents at HF radar measurement depth in the Tsushima Strait Using HIP radar2007

    • Author(s)
      Yoshikawa, Y., A.Masuda, K.Marubayashi, M.Ishibashi, A.Okuno
    • Organizer
      Monitoring and Forecasting of the Rapid change in Ocean-Atmosphere Environment in the East Asia
    • Place of Presentation
      Fukuoka, Japan
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 海洋短波レーダーシステムによる海況監視の現状と将来展望2007

    • Author(s)
      吉川 裕
    • Organizer
      海洋におけるプラットフォーム技術検討プロジェクト委員会
    • Place of Presentation
      福岡
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] 対馬海峡東水道における反時計回り渦とクロロフィルa濃度の関係2007

    • Author(s)
      鬼塚 剛, 森本 昭彦, 滝川 哲太郎, 渡辺 敦, 吉川 裕, 柳 哲雄
    • Organizer
      日本海洋学会
    • Place of Presentation
      沖縄
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] 対馬海峡東水道における反時計回り渦の出現位置および周期2007

    • Author(s)
      中園 隆司, 吉川 裕, 増田 章, 丸林 賢次, 石橋 道芳
    • Organizer
      日本海洋学会
    • Place of Presentation
      沖縄
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] Surface Current Variations and Wind Driven Flow in the Tsushima Strait2007

    • Author(s)
      Yoshikawa, Y., A.Masuda, et. al.
    • Organizer
      Radiowave Oceanography Workshop 2008
    • Place of Presentation
      Cancun,Mexioo
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Seasonal Variations of Surface Currents and Estimated Interior Currents at HF R dar Measurement Depth in the Tsushima Strait2007

    • Author(s)
      Yoshikawa., Y, A. Masuda, K. Marubayashi, M. Ishibashi, A.
    • Organizer
      Monitoring and Forecasting of the Rapid Change in Ocean-Atmosphere Environment in the East Asia
    • Place of Presentation
      Fukuoka, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Relationship between the Anti-Clockwise Eddy and the Density of Chlorophyll-A i the Eastern Channel of the Tsushima Strait2007

    • Author(s)
      Onituka, T., A., Morimoto, Y., Yoshikawa, T., Takigawa, A., Watanabe, Y., Yoshiawa, T., Yanagi
    • Organizer
      Meeting of the Oceanographic Society of Japan
    • Place of Presentation
      Okinawa, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Location and Interval of the Generation of Anti-Clockwise Eddies in the Eastern Channel of the Tsushima Strait2007

    • Author(s)
      Nakazono., R, Y., Yoshikawa, A., Masuda, K., Marubayashi, M., Ishibashi
    • Organizer
      Meeting of the Oceanographic Society of Japan
    • Place of Presentation
      Okinawa, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Surface Current Variations and Wind Driven Flow in the Tsushima Strait2007

    • Author(s)
      Yoshikawa, Y., A., Masuda, et. al.
    • Organizer
      Radio Wave Oceanography Workshop 2007
    • Place of Presentation
      Cancun, Mexico
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Seasonal Variations of Surface Currents and Estimated Interior Currents at HF radar measurement depth in the Tsushima Strait Using HF radar2007

    • Author(s)
      Yoshikawa, Y., A. Masuda, K. Marubayashi, M. Ishibashi, A. Okuno
    • Organizer
      Monitoring and Forecasting of the Rapid change in Ocean-Atmosphere Environment in the East Asia
    • Place of Presentation
      Fukuoka, Japan
    • Related Report
      2007 Annual Research Report
  • [Presentation] Surface Current Variations and Wind Driven Flow in the Tsushima Strait2007

    • Author(s)
      Yoshikawa, Y., A. Masuda, et. al.
    • Organizer
      Radio Wave Oceanography Workshop 2008
    • Place of Presentation
      Cancun, Mexico
    • Related Report
      2007 Annual Research Report
  • [Remarks] 「研究成果報告書概要(和文)」より

    • URL

      http://www.riam.kyushu-u.ac.jp/LaboExp/

    • Related Report
      2007 Final Research Report Summary

URL: 

Published: 2005-04-01   Modified: 2016-04-21  

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