南海北部负跃层环境下海底参数声学反演
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摘要
利用2015年南海北部声学实验的实验数据,对海底声学参数进行反演。在综合分析声速起伏及海底模型对海底反演影响的基础上,通过选择等效的海水声速剖面和海底模型,改进了多参量联合地声反演方法,使得其不仅能解决反演中的多值性问题,还能适用于负跃层起伏环境下的声学反演。即当用匹配场反演海底声速和用传播损失反演海底衰减时,如果温跃层内有内波等随机起伏,可使用传播路径上平均声速剖面和单层等效海底进行声场计算。反演得到的海底声速和密度结果与海底采样测量符合较好,拟合给出了海底衰减系数随频率的非线性经验关系式。反演结果可为南海北部声传播规律研究与应用提供海底参数。
The acoustic parameters of the seabed in the northern South China Sea were inversed using the experiment data from an acoustic experiment in 2015. Based on the comprehensive analysis of the influence of the sound speed fluctuation and the submarine model on seabed inversion, the multi-parameter hybrid acoustic inversion scheme is improved by selecting the equivalent sound speed profile and the submarine model to apply in the thermocline environment with fluctuation. In other words, mean sound speed profile and half infinite bottom model are used in forward sound field calculation to save the inversion dimensions. The inverted seafloor velocity and density are in good agreement with the core sampling measurements. The nonlinear empirical relationship of the attenuation coefficient with frequency is given out. The inversion results are meaningful to the sound propagation research and application in the northern area of the South China Sea.
The acoustic parameters of the seabed in the northern South China Sea were inversed using the experiment data from an acoustic experiment in 2015. Based on the comprehensive analysis of the influence of the sound speed fluctuation and the submarine model on seabed inversion, the multi-parameter hybrid acoustic inversion scheme is improved by selecting the equivalent sound speed profile and the submarine model to apply in the thermocline environment with fluctuation. In other words, mean sound speed profile and half infinite bottom model are used in forward sound field calculation to save the inversion dimensions. The inverted seafloor velocity and density are in good agreement with the core sampling measurements. The nonlinear empirical relationship of the attenuation coefficient with frequency is given out. The inversion results are meaningful to the sound propagation research and application in the northern area of the South China Sea.
引文
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2 Zhou J X. Normal mode measurements and remote sensing of sea-bottom sound velocity and attenuation in shallow water. J. Acoust. Soc. Am., 1985; 78(3):1003-1009
3 Gerstoft P. Parameter estimation using multifrequency range-dependent acoustic data in shallow water. J. Acoust.Soc. Am., 1996; 99(5):2839-2850
4 Carbone N M, Deane G B et al. Estimating the compressional and shear wave speeds of a shallow water seabed from the vertical coherence of ambient noise in the water column. J. Acoust. Soc. Am., 1998; 103(2):801-813
5江鹏飞,林建恒,马力.一种海洋环境噪声分布反演地声参数方法·声学学报,2016; 41(1):59-66
6李风华,张仁和.由脉冲波形与传播损失反演海底声速与衰减系数·声学学报,2000; 25(4):297-302
7金国亮,张仁和.由浅海混响反演海底反射和散射系数.声学学报,1996; 21(4):565-572
8高伟,王宁,王好忠.2005黄海实验混响垂直相关统计反演海底参数.声学学报,2008; 33(2):109-115
9张学磊,李整林,黄晓砥.一种地声参数的联合反演方法.声学学报,2009; 34(1):54-59
10屈科,胡长青,赵梅.利用传播损失反演海底单参数.声学学报,2013; 38(4):472-476
11 Wu S L, Li Z L et al. Geoacoustic inversion for bottom parameters in the deep-water area of the South China Sea.Chin. Phis. Lett., 2015; 32(12):70-73
12 Li Z L, Zhang R H et al. Geoacoustic inversion by matchedfield processing combined with vertical reflection coefficients and vertical correlation. IEEE J. Oceanic Eng.,2005; 29(4):973-979
13 Li Z L. Inversion for the sea bottom acoustic parameters by using the group time delays and amplitude of normal mode.Chinese Journal of Acoustics, 2003; 22(2):176-183
14 Li Z L, Zhang R H. A broadband geoacoustic inversion scheme. Chin. Phis. Lett., 2004; 21(6):1100-1103
15 Li Z L, Zhang R H. Geoacoustic inversion based on dispersion characteristic of normal modes in the shallow water.Chin. Phis. Lett., 2007; 24(2):471-474
16 Li Z L, Li F H. Geoacoustic inversion for sediments in the South China Sea based on a hybrid inversion scheme. Chin.J. Oceanol. Limnol.,2010; 28(5):990-995
17任云,吴立新,李整林,周仕锋.南中国海存在孤立子内波条件下的声场时间相关半径.声学学报,2010; 35(5):515-522
18 Michael I T, George N M. Inverse problems in underwater acoustics. New York, 2001:1-14
19杨坤德,马远良.浅海地声参数宽带匹配场反演的实验研究.西北工业大学学报,2003; 21(5):611-615
20 Huang C F, Gerstoft P et al. Effect of ocean sound speed uncertainty on matched-field geoacoustic inversion.J. Acoust. Soc. Am., 2008; 123(6):162-168
21何利,李整林等.南海北部海水声速剖面声学反演.中国科学,2011; 41(1):49-57
22 Collins M D. A split-step Pade solution for the parabolic equation method. J. Acoust. Soc. Am.,1993; 93(4):1736-1742
23 Li Z L, Zhang R H, Peng Z H, Li X L. Anomalous sound propagation due to the horizontal variation of seabed acoustic properties. Science in China Series G:Physics,Mechanics and Astronomy, 2004; 47(5):571-580
24 Hamilton E L. Geoacoustic modeling of the sea floor. J.Acoust. Soc. Am.,1980; 68(5):1313-1340
25 Biot M A. Generalized theory of acoustic propagation in porous dissipative media. J. Acoust. Soc. Am. 1962;34(9A):1254-1264
26 Stoll R D. Marine sediment acoustics. J. Acoust. Soc.Am., 1985; 77(5):1789-1799
27 Zhou J X, Zhang X Z et al. Low-frequency geoacoustic model for the effective properties of sandy sea bottoms. J.Acoust. Soc. Am., 2009; 125(5):2847-2866
2 Zhou J X. Normal mode measurements and remote sensing of sea-bottom sound velocity and attenuation in shallow water. J. Acoust. Soc. Am., 1985; 78(3):1003-1009
3 Gerstoft P. Parameter estimation using multifrequency range-dependent acoustic data in shallow water. J. Acoust.Soc. Am., 1996; 99(5):2839-2850
4 Carbone N M, Deane G B et al. Estimating the compressional and shear wave speeds of a shallow water seabed from the vertical coherence of ambient noise in the water column. J. Acoust. Soc. Am., 1998; 103(2):801-813
5江鹏飞,林建恒,马力.一种海洋环境噪声分布反演地声参数方法·声学学报,2016; 41(1):59-66
6李风华,张仁和.由脉冲波形与传播损失反演海底声速与衰减系数·声学学报,2000; 25(4):297-302
7金国亮,张仁和.由浅海混响反演海底反射和散射系数.声学学报,1996; 21(4):565-572
8高伟,王宁,王好忠.2005黄海实验混响垂直相关统计反演海底参数.声学学报,2008; 33(2):109-115
9张学磊,李整林,黄晓砥.一种地声参数的联合反演方法.声学学报,2009; 34(1):54-59
10屈科,胡长青,赵梅.利用传播损失反演海底单参数.声学学报,2013; 38(4):472-476
11 Wu S L, Li Z L et al. Geoacoustic inversion for bottom parameters in the deep-water area of the South China Sea.Chin. Phis. Lett., 2015; 32(12):70-73
12 Li Z L, Zhang R H et al. Geoacoustic inversion by matchedfield processing combined with vertical reflection coefficients and vertical correlation. IEEE J. Oceanic Eng.,2005; 29(4):973-979
13 Li Z L. Inversion for the sea bottom acoustic parameters by using the group time delays and amplitude of normal mode.Chinese Journal of Acoustics, 2003; 22(2):176-183
14 Li Z L, Zhang R H. A broadband geoacoustic inversion scheme. Chin. Phis. Lett., 2004; 21(6):1100-1103
15 Li Z L, Zhang R H. Geoacoustic inversion based on dispersion characteristic of normal modes in the shallow water.Chin. Phis. Lett., 2007; 24(2):471-474
16 Li Z L, Li F H. Geoacoustic inversion for sediments in the South China Sea based on a hybrid inversion scheme. Chin.J. Oceanol. Limnol.,2010; 28(5):990-995
17任云,吴立新,李整林,周仕锋.南中国海存在孤立子内波条件下的声场时间相关半径.声学学报,2010; 35(5):515-522
18 Michael I T, George N M. Inverse problems in underwater acoustics. New York, 2001:1-14
19杨坤德,马远良.浅海地声参数宽带匹配场反演的实验研究.西北工业大学学报,2003; 21(5):611-615
20 Huang C F, Gerstoft P et al. Effect of ocean sound speed uncertainty on matched-field geoacoustic inversion.J. Acoust. Soc. Am., 2008; 123(6):162-168
21何利,李整林等.南海北部海水声速剖面声学反演.中国科学,2011; 41(1):49-57
22 Collins M D. A split-step Pade solution for the parabolic equation method. J. Acoust. Soc. Am.,1993; 93(4):1736-1742
23 Li Z L, Zhang R H, Peng Z H, Li X L. Anomalous sound propagation due to the horizontal variation of seabed acoustic properties. Science in China Series G:Physics,Mechanics and Astronomy, 2004; 47(5):571-580
24 Hamilton E L. Geoacoustic modeling of the sea floor. J.Acoust. Soc. Am.,1980; 68(5):1313-1340
25 Biot M A. Generalized theory of acoustic propagation in porous dissipative media. J. Acoust. Soc. Am. 1962;34(9A):1254-1264
26 Stoll R D. Marine sediment acoustics. J. Acoust. Soc.Am., 1985; 77(5):1789-1799
27 Zhou J X, Zhang X Z et al. Low-frequency geoacoustic model for the effective properties of sandy sea bottoms. J.Acoust. Soc. Am., 2009; 125(5):2847-2866