パッシブ・モビング・ソース・オーシャン・アコースティック・トモグラフィー (不確実性定量化) は,チャンス船からの相対的な到着時間を用いて定量化されます
Heriberto J Vazquez1, Bruce D Cornuelle1, William S Hodgkiss1
1Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, USA.
The Journal of the Acoustical Society of America
|February 13, 2026
まとめ
海洋音響トモグラフィーは,サンタバーバラ運河における音速の推定のために船舶の騒音を使用しました. この方法は有望ですが,従来の技術よりも高い不確実性があります.
科学分野:
- 海洋学 海洋学とは
- アコースティクス アコースティクス
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 海洋音響トモグラフィーは,通常,制御された情報源と絶対的な移動時間を使用します.
- 機会の船は,音響トモグラフィーのための潜在的な代替音源を提供します.
- 沿岸環境における音の伝播を理解することは,様々な用途において極めて重要です.
研究 の 目的:
- 放射された船舶の騒音を使用して海洋音響トモグラフィの逆転を行う.
- 相対的な到着時間から得られた音速推定の不確実性を定量化するために.
- 短距離トモグラフィーの表面反射と配列幾何学の影響を調査する.
主な方法:
- 2つの垂直線配列によって受信された船舶放射騒音からの相対的な到着時間を利用した.
- サンタバーバラ運河で音響トモグラフィの逆転を行った.
- 根の正方形平均 (rms) の差を用いて定量化された不確実性.
主要な成果:
- 船舶の騒音を用いた音速の推定は,以前の研究 (0.71 m/s rms差) と良好な一致を示した.
- 相対的な到着時間の推定値は,絶対的な移動時間 (0.89 m/s rms) と比較して,より高い不確実性 (1.42 m/s rms) を有しました.
- 直接到着と表面反射到着の間の深度の異なる干渉が観察され,時間遅延の推定に影響を与えました.
結論:
- 船舶の騒音による海洋音響トモグラフィーは,音速の推定のために実現可能である.
- 不確実性の定量化は,この方法による結果の解釈に不可欠です.
- 干渉効果は,表面に近づく源を持つ短距離トモグラフィで慎重に考慮する必要があります.
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