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川の噴水は,沿岸の海洋における大幅の内部波の源泉である
Jonathan D Nash1, James N Moum
1College of Oceanic and Atmospheric Sciences, Oregon State University, 104 COAS Admin Bldg, Oregon State University, Corvallis, Oregon 97331, USA. nash@coas.oregonstate.edu
Nature
|September 16, 2005
まとめ
川の梅のフロントは強力な内部波を生成し,沿岸の海洋混合に不可欠です. このプロセスは,羽根のダイナミクスによって駆動され,海の混合への影響において潮と地形の相互作用と競合する.
科学分野:
- 海洋学 海洋学 海洋学
- 流体力学 流体力学とは
- リモートセンシング (リモートセンサー)
背景:
- 内部波は,密度インターフェースによって誘発される,エネルギーに満ちた沿岸の海洋現象である.
- それらは,栄養素の混合と生物学的生産性に大きな影響を与えます.
- 多くの場合,潮トポグラフィに結びついているが,他の生成メカニズムも存在する.
研究 の 目的:
- 河川の羽根フロントからの内部波の発生を調査する.
- 羽根フロントからの波放出のダイナミクスを理解するために.
- この生成メカニズムを潮-地形相互作用と比較するために.
主な方法:
- 速度,密度,そして音響の逆分散を繰り返し測定する.
- コロンビア川の羽根フロントで収集されたデータの分析.
- 波動力学と放出メカニズムに関する観察的研究.
主要な成果:
- 内部波は,コロンビア川の羽根フロントが重力流として作用することで発生します.
- 羽根フロントの収束は,フロントの成長と下向きの水位移動につながります.
- 自由に伝播する波は,フロントの速度が波速を下回ると放出されます.
結論:
- 川の浮き前線は,沿岸海における内部波の重要な源である.
- このメカニズムは,波幅と急さにおいて,潮と地形間の相互作用による波に匹敵する波を生成する.
- この過程を理解することは,沿岸の海洋混合研究にとって不可欠です.
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