文章摘要
杨挺.典型浅海地声模型下的反射波特性初步研究[J].声学技术,1997,(4):198~201
典型浅海地声模型下的反射波特性初步研究
Preliminary study on reflection characteristics of a typical geo-acoustic modeling of shallow water
投稿时间:1996-12-27  
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杨挺 同济大学海洋地质与地球物理系, 上海 200092 
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中文摘要:
      本文给出了一种典型浅海地声模型下,波动方程有限差分正演的计算方法,并详细分析了沉积层的顶层速度、厚度、速度梯度、密度梯度,以及震源特性等参数变化时反射波受其影响的一般规律:而且对于航道底部的浮泥层作了重点研究,从而得到了浮泥层的容重变化率及其厚度对反射波的影响规律,以及浮泥厚度与反射波特征谱之间的关系。这对于解决长江口航道的安全行船深度这一实际问题是很有意义的。
英文摘要:
      Forward modeling, which simulates the signals reflected from seabed, is an effective approach in underwater geo-acoustic detection research. This paper presents a wave-equation-based, finite-difference modeling algorithm, which is concerned with a typical geo-acoustic modeling of shallow water, and analyses, in detail, the pattern followed by variation of reflection with the coefficient of sediment such as upper velocity, thickness, speed gradient, density gradient and the nature of source. Additionally, more attention has been paid to a practical modeling waterway and we obtained the law of the dependence of reflected wave on the thickness and density gradient of the floating mud in waterway, and relationship between the thickness of floating mud and the feature spectrum of reflection. All this will be the bases of the following research concerning with determining the navigable depth of a waterway.
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