-
弹性沉积层海底的低掠射角反射存在奇异性极大值的频率特征，其特征对浅海远程声传播会产生显著的影响。针对中国南海东沙海域的一次海底与波导联合测量到的频率间隔小的海底共振与声虹吸现象。通过分析弹性沉积层海底的低掠射角反射特征，理论推导了沉积层与剪切波的共振频率表达式，并分析了海底反射特征对远程声传播的影响。结果表明：在弹性沉积层海底模型下，受剪切波调制的小掠射角反射特征会引起指定频率的剪切波在沉积层发生共振，从而导致水中传播的声能被沉积层禁锢而出现声虹吸效应。进一步根据海底剪切波共振频率相关参数的敏感性及耦合性的分析结果，提出了一种结合海底与波导观测信息的地声参数反演策略用于获取实验海域的底质参数，反演结果验证了弹性沉积层海底模型对水体中声虹吸效应的作用机制。The low-grazing-angle reflection from an elastic sediment seabed exhibits singularly enhanced frequency characteristics, which significantly influence long-range sound propagation in shallow water. To study the influence of elastic sedimentary layer seabed environment on long-range sound propagation in shallow waters, we conducted a joint measurement of seabed and waveguide sound propagation experiment in the Dongsha area of the South China Sea. The experiment recorded the simultaneous occurrence of seabed resonance and the sound siphon effect for the first time. Notably, this effect differs from the sound siphon effect observed in low-sound-speed seabed environments, as it exhibits smaller frequency intervals. By analyzing the low-grazing-angle reflection characteristics of the elastic seabed, we derived a theoretical model for the resonance frequencies of shear waves in elastic sediment layers under small grazing angles and investigated their impact on long-range sound propagation. The results demonstrate that under an elastic seabed model, the low-grazing-angle reflection modulated by shear waves induces resonance at specific frequencies within the sediment layer. This traps acoustic energy in the seabed, leading to the sound siphon effect. Furthermore, we analyzed the sensitivity and coupling of key parameters related to shear-wave resonance frequencies. Based on these findings, we developed an inversion strategy that integrates seabed and waveguide observations to estimate geo-acoustic parameters of the experimental area. The inversion results validate the mechanism by which the elastic seabed model contributes to the sound siphon effect in the water column.
-
[1] Katsnelson B, Petnikov V, Lynch J 2012 Fundamentals of Shallow Water Acoustics (New York: Springer Press) p65
[2] Duncan A J, Gavrilov A N, McCauley R D, Parnum I M, Collis J M 2013 J. Acoust. Soc. Am. 134 207
[3] Godin O A 2021 J. Acoust. Soc. Am. 149 3586
[4] Godin O A 2025 J. Acoust. Soc. Am. 157 314
[5] Zhang S Z, Piao S C 2021 Acta Physica Sinica 70 214304-1 (in Chinese) [张士钊, 朴胜春 2021 物理学报, 70 214304-1]
[6] Akal T, Berkson J 1986 Ocean Seismo-Acoustics: Low-Frequency Underwater Acoustic (New York & London: Nato Scientific Affairs Division Plenum Press) p149
[7] Xie J H, Cao D J, Zhang H G 2024 Journal of Physics: Conference Series 2718 Changsha City, China, October 13-15 2023, p 012070
[8] Fokina M S, Fokin V N 2001 J. Comput. Acoust. 09 1079
[9] Godin O A, Chapman D M F 1999 J. Acoust. Soc. Am. 106 2367
[10] Godin O A, Deal T J, Dong H F 2021 J Acoust Soc Am. 149 49
[11] Dall'Osto D R, Tang D J 2022 J. Acoust. Soc. Am. 151 3473
[12] Kuperman W A, Jensen F B 1980 Bottom-Interacting Ocean Acoustics (New York: Plenum Press) p135
[13] Hermand J P, Siderius M 1997 J. Acoust. Soc. Am. 102 3142
[14] Wilson P S, Knobles D P, Neilsen T B 2020 IEEE J. Ocean. Eng. 45 1
[15] Wilson P S, Knobles D P, Neilsen T B 2022 IEEE J. Oceanic Eng. 47 497
[16] Zhou J X, Li Z L, Zhang X Z, Qin J X 2024 J. Acoust. Soc. Am. 155 3490
[17] Li M Z, Li Z L, Zhou J X, Zhang R H 2019 Acta Phys. Sin. 68 094301 (in Chinese) [李梦竹，李整林，周纪浔，张仁和 2019 物理学报 68 094301]
[18] Zhou J X, Qin J X, Li Z L, Zhang X Z 2024 J. Acoust. Soc. Am. 156 1575
[19] Hughes S J, Ellis D D, Chapman D M F, Philip R S 1990 J. Acoust. Soc. Am. 88 283
[20] Hovem J M, Solberg C E, Tollefsen D 2001 MTS/IEEE Oceans 2001 Honolulu, HI, USA, November 5-8, p715
[21] Zhang H G, Xie J H, Wang X H, Ma Z K 2024 Acta Acustica 49 835 (in Chinese) [张海刚， 谢金怀， 王笑寒， 马志康 2024 声学学报 49 835]
[22] Zheng G X, Piao S C, Dong Y, Gong L J 2024 JASA Express Lett. 4 126004
[23] Li L, Chen Z, Liu J G, Chen H, Yan W, Zhong Y 2014 J. Trop Ocean. 33 54 (in Chinese) [李亮，陈忠，刘建国，陈翰，颜文，仲义 2014 热带海洋学报 33 54].
[24] Vanneste M, Madshus C, Socco V L, Maraschini M, Sparrevik P M, Westerdahl H, Duffaut K, Skomedal E, Bjørnara T I 2011 Geophys. J. Int. 185 221
[25] Socco V L, Boiero D, Maraschini M, Vanneste M, Madshus C, Westerdahl H, Duffaut K, Skomedal E 2011 Geophys. J. Int. 185 237
[26] Acoustics toolbox, Porter M B https://oalib-acoustics.org/ [2025-5-20]
[27] Zhang R H, Li F H 1999 Sci. China, Ser. A Math. 42 739
[28] Brekhovskikh L M, Godin O A 1998 Acoustics of Layered Media. 1: Plane and Quasi-Plane Waves (Vol. 2) (Berlin: Springer Press) p14
[29] Kennedy J, Eberhart R. 1995 IEEE Int Conf on Neural Networks Perth, WA, Australia 1995 p1941
计量
- 文章访问数: 303
- PDF下载量: 6
- 被引次数: 0
下载:
