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浅海声场声强谱存在干涉结构,在声源和接收器固定的情况下,声强干涉谱与海洋环境参数存在对应关系.应用声强干涉结构信息监测浅海温跃层深度起伏,在温跃层初始深度已知的情况下(温盐深仪或声速仪测量得到),利用单水听器记录宽带信号干涉谱的时变结构反演得到浅海温跃层深度随时间变化.数值仿真验证了方法的有效性并应用于05黄海内波与锋面声传播起伏实验(AEYFI-05:Acoustics Experiment of Yellow Sea Oceanic Front and Internal Waves2005)数据.考虑传播路径的水平变化特性,引入绝热近似修正使得反演精度明显提高,温跃层深度起伏反演结果与温度链实测结果吻合良好.该方法可用在夏秋季环境下的强温跃层深度时变特征监测.
There is an interference structure in the sound intensity spectrum of the shallow sea sound field. Under the condition of fixed source and receiver, there is a corresponding relationship between the acoustic intensity interference spectrum and the marine environmental parameters.Using the information of the sound intensity interference structure to monitor the depth fluctuation of the shallow sea thermocline, The depth of the shallow sea thermocline changes with time using the single hydrophone to record the time-varying structure inversion of the broadband signal interference spectrum when the initial depth is known (measured by the temperature and salinity sounder or the sound velocity meter). The numerical simulation verifies that the method (AEYFI-05: Acoustics Experiment of Yellow Sea Oceanic Front and Internal Waves 2005). Considering the horizontal variation of the propagation path, the adiabatic approximation correction is introduced to make the inversion accuracy And the temperature thermocline inversion results are in good agreement with the measured results of the temperature chain.The method can be used to monitor the temperature-time characteristics of the thermocline depth in summer and autumn.