YU Shengqi, LIU Baohua, YU Kaiben, YANG Zhiguo, KAN Guangming. A backscattering model for a stratified seafloor[J]. Acta Oceanologica Sinica, 2017, 36(7): 56-65. doi: 10.1007/s13131-017-1084-1
Citation: YU Shengqi, LIU Baohua, YU Kaiben, YANG Zhiguo, KAN Guangming. A backscattering model for a stratified seafloor[J]. Acta Oceanologica Sinica, 2017, 36(7): 56-65. doi: 10.1007/s13131-017-1084-1

A backscattering model for a stratified seafloor

doi: 10.1007/s13131-017-1084-1
  • Received Date: 2016-10-09
  • Rev Recd Date: 2016-12-16
  • 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.
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  • 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
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