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典型东海黑潮锋环境下的声场分布异常分析 预览 被引量:3

Analyze of abnormal sound field distribution in an environment of typical Kuroshio front in the East China Sea
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摘要 东海黑潮锋作为中国近海的一类特殊海洋学现象,对水声传播产生的复杂影响已受到关注,但对其影响机制的认识还较为欠缺.应用BELLHOP水声学数值模型分析了典型东海黑潮锋环境下的声场特性,结果表明:穿过锋面时声线干涉伴随的声能强弱空间分布出现明显偏移,同时波导中泄漏的声能对锋面非均匀环境引起的传播损失进行了补偿,使波导区域之外的声能变化小于5dB(声波频率为1kHz).相比之下,从外海暖水混合层向近海传播时表面声道的瓦解可使传播损失突然增大10~15dB(声波频率为1kHz).东海黑潮锋环境下的声场能量异常分布体现了海底地形和水文环境的共同影响,地形条件对声场样式起支配性作用,而锋面引起的非均匀水文环境则是使声能空间分布出现异常变化的关键调制性因素. Kuroshio front is a special phenomenon of East China Sea, whose complicated effects on acoustic propa- gation have aroused general concern, but still deficient in mechanism understanding. Sound field features under the environment of Kuroshio front in East China Sea are analyzed by BELLHOP model. The results show that the inter- ference pattern of acoustic energy distribution may shift when sound wave is propagating across frontal zone, and the energy leaked from duct area can partly compensate transmission loss caused by heterogeneous hydrological environ- ment, which make energy change outside the duct area less than 5 dB (frequency 1 kHz). By comparison, the transmission loss can abruptly increase by 10 - 15 dB (frequency 1 kHz) when sound is propagating in the mixed - layer from coastal area to open sea area. Abnormal distribution of sound field under the Kuroshio front setting re- flects a comprehensive influence of topography and hydrologic environment. Topography is a dominating factor to sound field pattern, while heterogeneous hydrological environment caused by the front is a key factor regulating the acoustic energy redistribution.
作者 张旭 刘艳 孙杰 ZHANG Xu, LIU Yan, SUN Jie ( Unit 91550 of PLA, Dalian 116023, China)
机构地区 中国人民解放军
出处 《应用海洋学学报》 CAS CSCD 2013年第3期324-330,共7页 Journal of Oceanography In Taiwan Strait
关键词 海洋声学 东海黑潮锋 非均匀环境 声场 海底地形 ocean acoustics Kuroshio front in the East China Sea heterogeneous hydrological environment sound field topography
作者简介 张旭(1982~),男,博土,工程师
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