The Characteristics of the Flow Pattern in Toyama Bay by onboard ADCP Obeseravations

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  • Chiba Hajime
    Department of Maritime Technology, National Institute of Technology, Toyama College
  • Michida Yutaka
    Atmosphere and Ocean Research Institute, The University of Tokyo,
  • Furuyama Sho-ichi
    Department of Electronics and Computer Engineering, National Institute of Technology, Toyama College
  • Hashimoto Shintaro
    Training Ship “Wakashio-maru,” National Institute of Technology, Toyama College

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Other Title
  • 船舶搭載型ADCPで捉えられた富山湾の流れの特性
  • 船舶搭載型ADCPで捉えられた富山湾の流れの特性 : 夏季湾奥部に発生する反時計回りの渦について
  • センパク トウサイガタ ADCP デ トラエラレタ トヤマワン ノ ナガレ ノ トクセイ : カキワン オウブ ニ ハッセイ スル ハン ドケイ マワリ ノ ウズ ニ ツイテ
  • －夏季湾奥部に発生する反時計回りの渦について－
  • -Anticlockwise eddy at the inner part of Toyama Bay in summer-

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Abstract

Toyama Bay, a semi-enclosed water body on the northern coast of Japan with its averaged water depth at 600m, has a steep bottom topography from the coast toward its central deeper part. It is known that there are basically three water masses in the bay: the Coastal Surface Layer Water, Tsushima Warm Current（TWC） Water and Japan Sea Proper Water from its surface to bottom. The present study describes the seasonal variation of the water masses and current structure in the bay, based on oceanographic observations, which include temperature and salinity with a CTD （Conductivity, Temperature and Depth profiler） system and current velocities with ADCP （Acoustic Doppler Current Profiler） mounted onboard the training ship Wakashio-maru that belongs to Toyama National College of Technology（ TNCT）. The data obtained in summer of 2005 and 2012 were used in this study. During the above cruses in summer we often observed an anticlockwise eddy with its diameters of about 20-30miles（37- 56km） in the inner part of the bay. Based on the series of the present observations, it is suggested that the anticlockwise eddy in summer is generated and maintained by TWC flowing into the bay along the coast of Noto Peninsula. Summer oceanographic conditions of smaller internal radius of deformation and the larger river water discharge in comparison with winter season enhance the formulation of this eddy.

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