摘要
应用分层声速剖面模型(LSSPM)和BELLHOP高斯束声场计算模型,对深海声速剖面结构变化引起的会聚区偏移特性进行了分析。结果表明,声速值的整体变化对会聚区影响很小,而混合层、主跃层、深海等温层及声道轴的变化都会使会聚区位置出现不同程度的偏移。主跃层是上层海洋变化的主要体现,混合层变化对会聚区的影响也是通过改变主跃层的形态结构实现的,跃层强度的增大使会聚区向远离声源方向偏移。深海等温层的声速变化体现了深海水团的结构差异,与主跃层引起的会聚区偏移呈反相变化。声道轴附近的声速变化体现了不同类型中层水团侵入和混合的影响,所引起的会聚区偏移反映了声道轴上层与下层梯度变化的综合效应,声速最小值的增加使会聚区向远离声源方向偏移。
Based on Layered Sound Speed Profile Model(LSSPM) and BELLHOP Gaussian acoustic Model,the deflected characteristics of convergence zone(CZ) caused by sound speed profile(SSP) structure change was analyzed.The result showed that the primary effect on CZ came from the SSP grads instead of sound speed value.Different kinds of configurations of mixed layer,thermocline,deep sound channel,and deep isothermal layer induced CZ shifting.The thermocline represented the dominating oceanographic environment change,and the influence of mixed layer on CZ was made by the change of thermocline structure.The increasing of thermocline intensify made CZ shift away from source.The deep isothermal layer was mainly affected by deep water masses,which caused an inverse change of CZ compared to thermocline.In the scope of deep sound channel,the CZ deflection was caused by the change of upper layer and lower layer together under the conditions of water mass intruding and mixing,and the CZ was shifting away from source when the minimum sound speed increased.
出处
《海洋通报》
CAS
CSCD
北大核心
2013年第1期45-52,共8页
Marine Science Bulletin
