大村湾の貧酸素水塊の消長に関する考察

• 田口 浩一

  長崎大学大学院工学研究科

• 刘 阳

  長崎大学大学院工学研究科

• 叶 灵娜

  株式会社ハイドロソフト技術研究所

書誌事項

タイトル別名

• Dynamic behavior of benthic oxygen-depleted water in Ohmura Bay

抄録

Hypoxia extending over the bottom water every year during summer involves Ohmura Bay in a serious environmental issue. Rise and fall of the hypoxic water mass was simulated with a 3D numerical eco-hydrodynamic model in order to investigate the relation with the influencing factors. The result shows that increased stratification during July-September induces and develops hypoxia in the bottom layer from June to mid-August by limiting vertical transport of oxygen. The benthic hypoxia reaches the highest stage in mid-August, then begins to decline gradually afterwards but lasts until early October. The recovery process of oxygen turned out to be closely related with change in the pathway of oceanic water intrusion into the central basin. After September, the oceanic water with rich oxygen begins to flow directly into the central basin, contributing toward alleviation of the hypoxia. Episodic wind event enhances vertical mixing and destroys the bottom hypoxic water quickly but only intermittently: hypoxia comes back and covers the seabed again immediately after the wind ceases. It is only a strong northerly wind caused by a tropical storm in the early stage of October that leads it to a termination every year.

収録刊行物

• 海洋理工学会誌

  海洋理工学会誌 20 (1-2), 11-27, 2014

  海洋理工学会

キーワード

• hypoxia
• stratification
• oceanic water
• vertical mixing
• Ohmura Bay

詳細情報

• CRID: 1390282680718807168
• NII論文ID: 130005056802
• DOI: 10.14928/amstec.20.1-2_11
• ISSN: 21883262
• ISSN: 13412752
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可