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首页> 外文期刊>IEEE Journal of Oceanic Engineering >Direct Measurements of Sediment Sound Speed and Attenuation in the Frequency Band of 2–8 kHz at the Target and Reverberation Experiment Site
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Direct Measurements of Sediment Sound Speed and Attenuation in the Frequency Band of 2–8 kHz at the Target and Reverberation Experiment Site

机译：在目标和混响实验现场直接测量2-8 kHz频带内的沉积物声速和衰减

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摘要

The sediment acoustic-speed measurement system is designed to measure in situ sediment sound speed and attenuation within the surficial 3 m of sediments in the frequency band of 2–8 kHz. Measurements were carried out during the Target and Reverberation EXperiment 2013 (TREX13) off Panama City, FL, USA. During TREX13, nine deployments at five selected sites were made along the 20-m isobath, termed the main reverberation track. The sediment types at the five selected sites ranged from coarse sand to a mixture of soft mud over sand, and the measured results show a spread of 80 m/s in sediment sound speed among the different types of sediments for all frequencies. Between 2–8 kHz, about 3% dispersion was observed at the sandy sites, whereas little dispersion was observed at the sites with mud. Preliminary attenuation results show 0.5–3.3 dB/m at the sandy sites, and 0.5–1.0 dB/m at the sites with mud in the same frequency band.
机译：泥沙声速测量系统设计用于在2-8 kHz频带内测量表层3 m泥沙中的泥沙声速和衰减。在美国佛罗里达州巴拿马城附近的“目标和混响实验2013（TREX13）”中进行了测量。在TREX13期间，沿20米等深线在五个选定的地点进行了9次部署，称为主要混响轨道。五个选定地点的沉积物类型从粗砂到软泥在砂上的混合不等，并且测量结果表明，在所有频率下，不同类型的沉积物的沉积物声速分布为80 m / s。在2–8 kHz之间，在沙质部位观察到约3％的分散，而在有泥浆的部位观察到很少的分散。初步的衰减结果显示，在相同的频带上，沙地站点为0.5–3.3 dB / m，在有泥浆的站点为0.5–1.0 dB / m。

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