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海洋通报  2012 

深海汇聚区的焦散结构与声能分布特征

DOI: 10.11840/j.issn.1001-6392.2012.3.007, PP. 283-289

Keywords: 汇聚区,焦散,传播损失,声线

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Abstract:

在深海汇聚区声场中,不同初始角的声线在传播过程中因折射程度差异形成特定的焦散结构。根据射线理论推导了线性剖面条件下用F算子表示的声线轨迹模型,并讨论了焦散结构与掠射角及声源-接收深度配置的变化关系。折射型焦散线由0o~5o的小角度声线构成,为波导结构;反射型焦散线由掠射角为±(5o~10o)的声线构成,为折线结构,且上行与下行声线的焦散线结构明显不同。应用BELLHOP模型分析得出了汇聚区增益与声源-接收深度条件的变化关系,并根据射线到达结构和焦散特征提出了一种确定汇聚区位置和范围的方法。

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