| KAN Guangming,LIU Baohua,YANG Zhiguo,YU Shengqi,QI Lehua,YU Kaiben,PEI Yanliang. 2019. Acoustic backscattering measurement from sandy seafloor at 6–24 kHz in the South Yellow Sea. Acta Oceanologica Sinica, 38(5):99－108 |
| Acoustic backscattering measurement from sandy seafloor at 6–24 kHz in the South Yellow Sea |
| 南黄海砂质海底反向声散射测量（6-24 kHz） |
| Received:August 06, 2018 |
| DOI：10.1007/s13131-019-1388-4 |
| Key words:acoustic backscattering strength sandy bottom South Yellow Sea gazing angle dependence frequency dependence |
| 中文关键词: 反向声散射强度 砂质海底 南黄海 掠射角依赖性 频率依赖性 |
| 基金项目:The Opening Fund of Pilot National Laboratory for Marine Science and Technology (Qingdao) under contract No. QNLM2016ORP0209; the National Natural Science Foundation of China under contract Nos 41330965, 41676055 and 41527809; the Taishan Scholar Project Funding under contract No. tspd20161007. |
| Author Name | Affiliation | E-mail | | KAN Guangming | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China | | | LIU Baohua | Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
National Deep Sea Center, Ministry of Natural Resources, Qingdao 266237, China | bhliu@ndsc.org.cn | | YANG Zhiguo | Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
National Deep Sea Center, Ministry of Natural Resources, Qingdao 266237, China | | | YU Shengqi | Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
National Deep Sea Center, Ministry of Natural Resources, Qingdao 266237, China | | | QI Lehua | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China | | | YU Kaiben | Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
National Deep Sea Center, Ministry of Natural Resources, Qingdao 266237, China | | | PEI Yanliang | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China | |
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| Abstract: |
| The acoustic bottom backscattering strength was measured at the frequency range of 6-24 kHz on a typical sandy bottom in the South Yellow Sea by using omnidirectional sources and omnidirectional receiving hydrophones. In the experiment, by avoiding disturbances due to scattering off the sea surface and satisfying the far-field condition, we obtained values of acoustic bottom backscattering strength ranging from -41.1 to -24.4 dB within a grazing angle range of 18°-80°. In the effective range of grazing angles, the acoustic scattering strength generally increases with an increase in the grazing angles, but trends of the variation were distinct in different ranges of frequency, which reflect different scattering mechanisms. The frequency dependence of bottom backscattering strength is generally characterized by a positive correlation in the entire frequency range of 6-24 kHz at the grazing angles of 20°, 40° and 60° with the linear regression slopes of 0.222 9 dB/kHz, 0.513 0 dB/kHzand 0.174 6 dB/kHz, respectively. At the largest grazing angle of 80°, the acoustic backscattering strength exhibits no evident frequency dependence. |
| 中文摘要: |
| 在南黄海某一典型的砂质海底区域，采用全向性声源和全向性接收水听器开展了频率范围为6-24 kHz的海底反向声散射测量。测量结果表明，在避免海面散射干扰并满足远场条件的情况下，本次实验获得了掠射角范围为18~80°的海底反向声散射强度，其数值为-41.1~24.4 dB。在有效掠射角范围内，声散射强度总体上随掠射角的增大呈现出增大趋势，但对于不同的频率，其变化趋势有所不同，反映出不同的散射机理。在20°、40°和60°掠射角处，在6-24 kHz的频率范围内反向声散射强度总体上呈现出正相关的频率依赖性，其线性相关斜率分别为0.2229 dB/kHz、0.5130 dB/kHz、0.1746 dB/kHz。在最大掠射角80°处，反向声散射强度未呈现出明显的频率相关性。 |
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