A backscattering model for a stratified seafloor

YU Shengqi; LIU Baohua; YU Kaiben; YANG Zhiguo; KAN Guangming

doi:10.1007/s13131-017-1084-1

一种分层海底反向散射模型

doi: 10.1007/s13131-017-1084-1

1.
国家深海基地管理中心, 国家海洋局, 青岛, 266237
2.
国家深海基地管理中心, 国家海洋局, 青岛, 266237;青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室, 青岛, 266237
3.
海洋沉积与环境地质国家海洋局重点实验室, 国家海洋局第一海洋研究所, 青岛, 266061;青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室, 青岛, 266237

基金项目: The National Natural Science Foundation of China under contract Nos 41606081, 41330965 and 41527809; the Taishan Scholar Project Funding under contract No. tspd20161007.

计量
- 文章访问数: 941
- HTML全文浏览量: 59
- PDF下载量: 907
- 被引次数: 0
出版历程
- 收稿日期: 2016-10-09
- 修回日期: 2016-12-16

A backscattering model for a stratified seafloor

1.
National Deep Sea Center, State Oceanic Administration, Qingdao 266237, China
2.
National Deep Sea Center, State Oceanic Administration, Qingdao 266237, China;Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
3.
Key Laboratory of Marine Sedimentology and Environmental Geology, The First Institute of Oceanography, Qingdao 266061, China;Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China

摘要

摘要: 为了更为准确地对海底反向散射强度进行预报，本文考虑了海底的分层结构，认为海底由有限厚度的沉积层和半无限空间的基岩构成。在计算海水、沉积层和基岩中声场的基础上，考虑了包括海水-沉积物界面粗糙散射、沉积层体积散射、沉积物-基岩界面粗糙散射和基岩体积散射在内的四种散射机制，建立了适用于低频（100 Hz-10 kH）条件下的分层海底反向散射模型。仿真结果表明：频率较低时（小于1 kHz），沉积物-基岩界面粗糙散射和基岩体积散射更为显著；而随着频率的增大，两者对海底反向散射强度的贡献逐渐减弱，反向散射强度最终趋近于高频（10-100 kHz）海底散射模型的预报结果；当基岩中的剪切波声速和衰减逐渐减小时，预报结果趋近于全流体模型，继而从另一个方面验证了本文提出的分层海底散射模型的有效性。
- 海底反向散射模型 /
- 分层海底 /
- 沉积物 /
- 基岩
Abstract: In order to predict the bottom backscattering strength more accurately, the stratified structure of the seafloor is considered. The seafloor is viewed as an elastic half-space basement covered by a fluid sediment layer with finite thickness. On the basis of calculating acoustic field in the water, the sediment layer, and the basement, four kinds of scattering mechanisms are taken into account, including roughness scattering from the water-sediment interface, volume scattering from the sediment layer, roughness scattering from the sediment-basement interface, and volume scattering from the basement. Then a backscattering model for a stratified seafloor applying to low frequency (0.1–10 kHz) is established. The simulation results show that the roughness scattering from the sediment-basement interface and the volume scattering from the basement are more prominent at relative low frequency (below 1.0 kHz). While with the increase of the frequency, the contribution of them to total bottom scattering gradually becomes weak. And the results ultimately approach to the predictions of the high-frequency (10–100 kHz) bottom scattering model. When the sound speed and attenuation of the shear wave in the basement gradually decrease, the prediction of the model tends to that of the full fluid model, which validates the backscattering model for the stratified seafloor in another aspect.
- bottom backscattering model /
- stratified seafloor /
- sediment /
- basement

HTML全文

参考文献(23)

Drumheller D M, Gragg R F. 2001. Evaluation of a fundamental integral in rough-surface scattering theory. The Journal of the Acoustical Society of America, 110(5): 2270-2275

Efimov A, Ivakin A. 1987. Sound scattering by inhomogeneities of layered sediments. Sudostroitelnaya Promyshlennost: Akustika (in Russian), 2(1): 24-31

Essen H H. 1994. Scattering from a rough sedimental seafloor containing shear and layering. The Journal of the Acoustical Society of America, 95(3): 1299-1310

Ivakin A N. 1986. Sound scattering by random inhomogeneities of stratified ocean sediments. Soviet Physics Acoustics, 32(6): 492-496

Ivakin A N. 1990. Sound scattering by inhomogeneities of an elastic half-space. Soviet Physics Acoustics, 36(4): 377-380

Ivakin A N. 1994a. Sound scattering by the rough interface and volume inhomogeneities of the sea bottom. Acoustical Physics, 40(3): 427-428

Ivakin A N. 1994b. Sound scattering by rough interfaces of layered media. In: Crocker M J, ed. Third International Congress on Air- and Structure-borne Sound and Vibration. Montreal, Canada: International Publications, 1563–1570

Ivakin A N. 1997. First-order model for bottom volume and roughness scattering. In: Zhang Renhe, Zhou Jixun, eds. Shallow-water Acoustics. Beijing: China Ocean Press, 359–364

Ivakin A N. 1998a. A unified approach to volume and roughness scattering. The Journal of the Acoustical Society of America, 103(2): 827-837

Ivakin A N. 1998b. Models for seafloor roughness and volume scattering. In: Jourdain J Y, ed. OCEANS’98 Conference Proceedings. Nice, France: OCEANS’98 IEEE/OES Conference Organizing Committee, 518–521

Ivakin A N, Jackson D R. 1998. Effects of shear elasticity on sea bed scattering: numerical examples. The Journal of the Acoustical Society of America, 103(1): 346-354

Jackson D R, Briggs K B, Williams K L, et al. 1996. Tests of models for high-frequency seafloor backscatter. IEEE Journal of Oceanic Engineering, 21(4): 458-470

Jackson D R, Ivakin A N. 1998. Scattering from elastic sea beds: first-order theory. The Journal of the Acoustical Society of America, 103(1): 336-345

Jackson D R, Odom R I, Boyd M L, et al. 2010. A geoacoustic bottom interaction model (GABIM). IEEE Journal of Oceanic Engineering, 35(3): 603-617

Jackson D R, Richardson M D. 2007. High-Frequency Seafloor Acoustics,: 338-348

Li Yuxin, Yang Yihua, Li Zhikuan, et al. 1987. An experimental study of deep scattering layer in the South China Sea. Acta Oceanologica Sinica, 6(1): 64-67

Lyons A P, Anderson A L, Dwan F S. 1994. Acoustic scattering from the seafloor: modeling and data comparison. The Journal of the Acoustical Society of America, 95(5): 2441-2451

Moe J E, Jackson D R. 1994. First-order perturbation solution for rough surface scattering cross section including the effects of gradients. The Journal of the Acoustical Society of America, 96(3): 1748-1754

Mourad P D, Jackson D R. 1989. High frequency sonar equation models for bottom backscatter and forward loss. In: Merry S L, ed. OCEANS’89 Conference Proceedings. Seattle, USA: OCEANS’98 IEEE/OES Conference Organizing Committee, 1168–1175

Mourad P D, Jackson D R. 1993. A model/data comparison for low-frequency bottom backscatter. The Journal of the Acoustical Society of America, 94(1): 344-358

Tang Dajun. 1996. A note on scattering by a stack of rough interfaces. The Journal of the Acoustical Society of America, 99(3): 1414-1418

Williams K L, Jackson D R. 1998. Bistatic bottom scattering: model, experiments, and model/data comparison. The Journal of the Acoustical Society of America, 103(1): 169-181

Williams K L, Jackson D R, Thorsos E I, et al. 2002. Acoustic backscattering experiments in a well characterized sand sediment: data/model comparisons using sediment fluid and Biot models. IEEE Journal of Oceanic Engineering, 27(3): 376-387

施引文献

资源附件(0)

访问统计

点击查看大图

计量

文章访问数: 941
HTML全文浏览量: 59
PDF下载量: 907
被引次数: 0

一种分层海底反向散射模型

doi: 10.1007/s13131-017-1084-1

计量

出版历程

A backscattering model for a stratified seafloor

计量

出版历程

目录