位置エネルギーによる浦の内湾の成層強度の評価とその有効性  [in Japanese] The Estimation of Stratified Intensity Due to Potential Energy and Its Effectivity in Uranouchi Bay  [in Japanese]

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Abstract

湾の環境は成層期と対流期で大きく変わる。気温が上昇し成層化が進むにつれて、低層の溶存酸素は減少し、やがて生物が生息できない貧酸素状態となる。ところが、気温が低下し対流が生じるようになると、貧酸素状態は速やかに解消される。このように湾の環境と深く係わりをもつ成層強度は、表底層水の温度差や塩分差、密度差で表す他に、より定量的にはバイサラ振動数や位置エネルギーで表される。ところが位置エネルギーによる内湾の成層強度評価についてはその例を見ない。ここでは、位置エネルギーにより浦の内湾の成層強度を評価し、その有効性について検討する。

The stratified intensity of water column can be estimated by measurements of temperature, salinity and densitygradients between the upper and lower water layer, but the quantitative method using the Vaisala frequency orpotential energy has been proved more efficient. The potential energy method was applied in this study forUranouchi Bay (southem Japan):(1) The water column's stratified intensity was a combination of potential energy by temperature and salinity.The latter, however, appeared to have more influence on stratification.(2) The seasonal change in stratified intensity consisted of short (1-2 months), and long period (1 year), corresponding to salinity and temperature changes, respectively.(3) Beside solar radiation and precipitation, mixing by intemal waves also influenced stratified intensity.(4) The estimation of stratified intensity with potential energy is effective in expressing the phenomenon of dissolved oxygen deficiency of bottom water.

Journal

  • Journal of Fisheries Engineering

    Journal of Fisheries Engineering 32(1), 7-11, 1995-07-31

    The Japanese Society of Fisheries Engineering

References:  4

Codes

  • NII Article ID (NAID)
    10008438552
  • NII NACSIS-CAT ID (NCID)
    AN10278554
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    09167617
  • Data Source
    CJP  J-STAGE  JASI 
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