| 一种分层海底反向散射模型 |
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| 引用本文： | 于盛齐,刘保华,于凯本,杨志国,阚光明.一种分层海底反向散射模型[J].海洋学报(英文版),2017,36(7):56-65. |
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| 作者姓名： | 于盛齐 刘保华 于凯本 杨志国 阚光明 |
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| 作者单位： | 国家深海基地管理中心, 国家海洋局, 青岛, 266237,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,国家深海基地管理中心, 国家海洋局, 青岛, 266237,国家深海基地管理中心, 国家海洋局, 青岛, 266237,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 |
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| 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. |
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| 摘 要： | 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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| 关 键 词： | 海底反向散射模型 分层海底 沉积物 基岩 |
| 收稿时间： | 2016/10/9 0:00:00 |
| 修稿时间： | 2016/12/16 0:00:00 |
A backscattering model for a stratified seafloor |
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| YU Shengqi,LIU Baohu,YU Kaiben,YANG Zhiguo and KAN Guangming.A backscattering model for a stratified seafloor[J].Acta Oceanologica Sinica,2017,36(7):56-65. |
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| Authors: | YU Shengqi LIU Baohu YU Kaiben YANG Zhiguo and KAN Guangming |
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| Institution: | National Deep Sea Center, State Oceanic Administration, Qingdao 266237, China,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,National Deep Sea Center, State Oceanic Administration, Qingdao 266237, China,National Deep Sea Center, State Oceanic Administration, Qingdao 266237, China and 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 |
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| 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. |
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| Keywords: | bottom backscattering model stratified seafloor sediment basement |
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