浅海中内波对匹配场时间相关的影响  

The effects of the internal waves on temporal correlation of matched-field processing in shallow water

作　　者：季桂花[1] 李整林[1] 戴琼兴[1] 

机构地区：[1]中国科学院声学所南海研究站

出　　处：《声学学报》2008年第5期419-424,共6页Acta Acustica

基　　金：中国科学院知识创新工程重大项目资助(KZCX1-VW-12-2);国家自然科学基金资助(10734100)

摘　　要：利用一次夏季浅海水文实验资料,数值仿真研究有线性内波和孤立子内波存在条件下的匹配场时间相关性。考察和总结了有内波存在时不同声源频率、声源深度和内波幅度等参数对匹配场时间相关的影响。研究结果表明:由于内波与声场的相互作用,匹配场时间相关长度会随着线性内波的平均能流密度及孤立子内波幅度的增大而减小;频率越高,声波穿过内波场时的匹配场时间相关下降的越快;声源位于跃层下时的匹配场时间相关明显的优于跃层上的情况;孤立子内波距声源的位置对匹配场时间相关影响相对较小。The effects of the linear internal waves and solitons on the temporal correlation of matched-field processing （MFP） in shallow water for the sources with different frequencies and different source depths were numerically investigated by using ocean environment measurements from an experiment. It is shown that the temporal correlation of MFP decreases as the amplitude of solitons or the average energy density of linear internal waves increased. For a source with lower frequency or located below the thermocline, the temporal correlation of MFP is less affected by internal waves, and the length of MFP correlation is longer. Moreover, the effects of the range between solitons and source on the temporal correlation of MFP are relatively small.

关 键 词：孤立子内波 时间相关性 匹配场 浅海 声源频率 平均能流密度 实验资料 数值仿真 

分 类 号：P733.2[天文地球—物理海洋学]