【摘要】：深度較淺的聲源其輻射聲波在陸架斜坡海域上坡傳播時,在斜坡頂端會出現(xiàn)聲能量急劇下降現(xiàn)象.利用射線聲學(xué)模型分析了造成這一現(xiàn)象的原因,并根據(jù)拋物方程聲場模型計算的深海和淺海平均傳播損失定義了"聲能量急劇下降距離",定量分析了聲源位置對該現(xiàn)象的影響.結(jié)果表明:聲源深度對"聲能量急劇下降距離"影響較大,而聲源與斜坡底端水平距離對其影響較小;當(dāng)聲源深度變大時,部分掠射角較小的聲線最終能夠達(dá)到斜坡頂端,致使"聲能量急劇下降距離"增大,繼續(xù)增加聲源深度,將導(dǎo)致上坡聲能量急劇下降現(xiàn)象消失.利用拋物方程聲場模型對陸架斜坡海域上坡聲傳播進(jìn)行數(shù)值仿真,結(jié)合"聲能量急劇下降距離"的定義,計算并比較了聲源位置不同時該距離的變化,數(shù)值計算結(jié)果驗證了理論分析.
[Abstract]:The sound energy of the shallow source will drop sharply when the sound wave propagates up the slope of the continental shelf slope. The causes of this phenomenon are analyzed by means of the ray acoustic model, and the "sharp drop distance of sound energy" is defined according to the average propagation losses in the deep sea and shallow water calculated by the sound field model of parabolic equation. The influence of sound source location on this phenomenon is quantitatively analyzed. The results show that the depth of sound source has a great influence on the distance of sharp drop of sound energy, but the horizontal distance between the sound source and the bottom of the slope has little effect on it. When the depth of the sound source becomes larger, the acoustic lines with small grazing angle can finally reach the top of the slope, which leads to the increase of the "distance of sharp drop of sound energy" and the further increase of the depth of the sound source, which will lead to the disappearance of the phenomenon of sharp decline of the sound energy up the slope. Using the parabolic equation sound field model, the numerical simulation of the sound propagation in the upper slope of the continental shelf is carried out, and the variation of the sound source position at different time is calculated and compared by combining the definition of "sharp drop distance of sound energy". The numerical results verify the theoretical analysis.
【作者單位】： 西北工業(yè)大學(xué)海洋聲學(xué)信息感知工業(yè)和信息化部重點實驗室;西北工業(yè)大學(xué)航海學(xué)院;
【基金】：國家自然科學(xué)基金(批準(zhǔn)號:11534009)資助的課題~~
【分類號】：P733.2
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本文編號：2417461