南海浅海海底沉积物的声衰减

刘强; 卢博

南海浅海海底沉积物的声衰减

刘强¹,
卢博²

1.
中国科学院南海海洋研究所中国科学院边缘海地质重点实验室, 广东广州, 510301
2.
国家海洋局南海分局南海工程勘察中心, 广东广州 510275

基金项目: 国家自然科学基金资助项目(40676040);声场声信息国家重点实验室开放课题资助项目(200703)

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出版历程
- 收稿日期: 2007-05-30
- 修回日期: 2008-02-28

Seabed sediment acoustic attenuation in shallow seas of the South China Sea

LIU Qiang¹,
LU Bo²

1.
Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
South China Sea Marine Engineering Surveying Center, South China Sea Branch, State Oceanic Administration, Guangzhou 510275, China

摘要

摘要: 报道了南海浅海海底沉积物的声衰减性质。给出了测量和计算海底沉积物声衰减的方法。分析讨论了不同频率下的声衰减以及与若干个海底沉积物物理参数的关系,结果表明,同一类型沉积物在高频段时的声衰减要比低频段的声衰减大;同一频段下粗颗粒沉积物的声衰减要比细颗粒的声衰减大;北部湾海底浅层沉积物声衰减在低频100kHz下为80~150dB/m,在高频1MHz下为150~360dB/m;海南岛南部外海海底浅层沉积物声衰减在低频下为66~160dB/m,在高频1MHz下为190~350dB/m;高频段的数据与台湾海峡北部海底表层沉积物声衰减测量分析数据比较接近,而低频段的数据与台湾海峡北部海底表层沉积物声衰减测量分析数据有较大的差别。
- 南海浅海 /
- 海底沉积物 /
- 声衰减 /
- 声衰减测量
Abstract: Seabed sediment acoustic attenuation properties in shallow seas of the South China Sea were reported,a new way to measure and calculate the seabed sediment acoustic attenuation was presented,the results from two different frequencies were analyzed and the relation among several physical parameters of seabed sediment was discussed.Results show that the acoustic attenuation at the high frequency is much higher than that at the low frequency in the same type sediment;the acoustic attenuation of coarse granule sediment is higher than that of fine-particle sediment at the same measuring frequency.The acoustic attenuation is respectively 80~150/150~360 dB/m at low/high frequencies in the shallow sea seabed sediment of the Beibu Gulf and in the shallow sea seabed sediment of the southern H ainan Province,and the attenuation result is respectively 66~160/190~350 dB/m at low/high measuring frequencies.Comparing results with data from acoustic attenuation measurement of surface sediments in the northern Taiwan Strait,the data at the high frequency approach to it,but other data at the low frequency have much difference from it.
- shallow seas of South China Sea /
- seabed sediment /
- acoustic attenuation /
- acoustic attenuation measurement

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