Acoustic reflection and attenuation characteristics of gas-containing sediment in the outer Lingding Bay of the Zhujiang Estuary in China

KAN Guang-ming; LIU Bao-hua; ZHANG Wei-gang; LI Guan-bao; LI Xi-shuang

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Article Navigation > Haiyang Xuebao > 2008 > 30(2): 26-32

KAN Guang-ming, LIU Bao-hua, ZHANG Wei-gang, LI Guan-bao, LI Xi-shuang. Acoustic reflection and attenuation characteristics of gas-containing sediment in the outer Lingding Bay of the Zhujiang Estuary in China[J]. Haiyang Xuebao, 2008, 30(2): 26-32.

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Acoustic reflection and attenuation characteristics of gas-containing sediment in the outer Lingding Bay of the Zhujiang Estuary in China

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266003, China;First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, Chnia1. College of Marine Geosciences, Ocean University of China, Qingdao 266003, China
2.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, Chnia
3.
College of Marine Geosciences, Ocean University of China, Qingdao 266003, China

Received Date: 2007-07-12
Rev Recd Date: 2007-10-10

Abstract

Abstract

High-resolution seism ic profiles indicate that there is a large area of seafloor gas-containing sediment in the outer Lingding Bay of the Zhujiang Estuary. According to the seismic reflection characteristics of gas-containing sediment,the seismic features of shallow gas are divided into five types:an acoustic blanket,an acoustic curtain,acoustic turbidity,anirregular strong topreflection boundary,and a reflection phase pull-down. The acoustic at tenuation of ga-scontaining sediment is primarily analyzed. The result indicates that there is an attenuation peak near the frequency of 3.3 kHz. According to the comparison between surveying data and model results,it is demonstrated that the attenuation peak frequency corresponds to the fundamental resonance frequency of bubbles with 6 mm equivalent radium. The primary conclusion is drawn that the acoustic attenuation is mainly caused by the damping reso nance of bubbles with the 6 mm equivalentradium.
- gas-containing sediment,
- acoustic reflection characteristics,
- acoustic attenuation,
- outer Lingding Bay in China

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References(19)

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