Wave Components and Energy Ratio Characteristics of Seismic Wave Field Motivated by Airgun Source in Shallow Water

doi:10.3969/j.issn.1000-1093.2021.05.016

Abstract

Abstract: The fluctuation components and their energy ratio characteristics of seismic wave field motivated by airgun source in shallow water are analyzed through theoretical derivation, numerical simulation and experiment.The layered model of shallow water is simulated using high-order staggered-grid finite difference method, and the wave systems and components of seabed seismic wave field are given. Wave components of the simulated seabed seismic wave field are separated using τ-p method, and the fluctuation components and their energy ratios of seismic wave field are simulated and analyzed. A lake trial and two sea trials were made to validate the theoretical and simulated results. The results demonstrate that the seabed seismic wave motivated by airgun source in water is divided into longitudinal wave, transversl wave, underwater acoustic wave, and surface wave, τ-p method can be used to separate the wave components of seismic wave field, and the sea bottom characteristics can be obtained from the signals received by the seismic array. The seabed seismic wave, interface wave and transversal wave are easily motivated on hard seabed, the longitudinal wave is easily motivated on soft seabed, and the interface wave is difficultly motivated on very soft seabed.

Key words: seabedseismicwavefield, airgunsource, τ-pmethod, wavefieldseparation, energyratio

CLC Number:

TB566

CHENG Guangli, LIU Bao, WANG Zeming, YANG Zhehui. Wave Components and Energy Ratio Characteristics of Seismic Wave Field Motivated by Airgun Source in Shallow Water[J]. Acta Armamentarii, 2021, 42(5): 1032-1040.

References

［1］王泽明.气枪声源激发的海底表面波特性研究［D］.武汉：海军工程大学,2018.
WANG Z M. Study on characteristics of seabed Scholte wave motivate by air gun source［D］. Wuhan: Naval University of Engineering,2018. （in Chinese）
［2］余赟,惠俊英,陈阳,等.浅海低频声场中目标深度分类方法研究［J］.物理学报,2009,58(9):6335-6343.
YU Y, HUI J Y, CHEN Y，et al. Research on target depth classification in low frequency acoustic field of shallow water［J］. Acta Physica Sinica，2009，58（9）：6335-6343.（in Chinese）
［3］卢再华，张志宏，顾建农.舰艇海底地震波形成机理的理论分析［J］.应用力学学报，2007，24（1）：54-57.
LU Z H，ZHANG Z H，GU J N．Theoretical analysis to mechanism of seafloor seismic wave induced by sailing vessel［J］．Chinese Journal of Applied Mechanics，2007，24(1)：54-57．（in Chinese）
［4］孟路稳，程广利，陈亚男，等.舰艇地震波传播机理及其在水雷引信中的应用研究［J］.兵工学报，2017，38（2）：319-325.
MENG L W，CHENG G L，CHEN Y N，et al. On the mechanism of ship seismic wave and its application on the mine fuze［J］. Acta Armamentarii,2017,38(2):319-325. （in Chinese）
［5］颜冰，周伟，龚沈光. 浅海地震波传播的简正波模型［J］．武汉理工大学学报，2006，30(5)：804-807.
YAN B, ZHOU W, GONG S G. A normal mode model for ocean seismo-acoustics in shallow water［J］. Journal of Wuhan University of Technology, 2006，30(5)：804-807．(in Chinese)
［6］卢再华，张志宏，顾建农．多孔介质水平分层海底低频地震波的数值模拟［J］．兵工学报，2014，35(12)：2065-2071．
LU Z H，ZHANG Z H，GU J N. A numerical simulation of seismic wave caused by low frequency source in shallow sea with thick po-rous sediment by staggered-grid finite difference method［J］.Acta Armamentarii, 2014，35(12)：2065-2071．(in Chinese)
［7］张海刚.浅海甚低频声传播建模与规律研究［D］.哈尔滨:哈尔滨工程大学,2010.
ZHANG H G. Research on modeling and rule of infrasound propagation in shallow sea［D］.Harbin: Harbin Engineering University,2010. （in Chinese）
［8］蒋生淼.气枪震源信号提取方法与传播特性研究［D］.北京：中国地震局地球物理研究所,2017.
JIANG S M. Processing method and propagation characteristics of airgun source signals ［D］. Beijing: Insititute of Seismophysics, China Earthquake Administration,2017.(in Chinese)
［9］ TELFORD W M, GELDART L P,SHERIFF R E.Applied seismophysics ［M］. Cambridge, UK:Cambridge University Press, 1976.
［10］孟路稳，程广利，陈亚男，等. 舰船地震传播机理及其在水雷引信中的应用研究［J］.兵工学报，2017,38(2):319-325.
MENG L W, CHENG G L, CHEN Y N, et al. On the mechanism of ship seismic wave and its application in the mine fuze［J］. Acta Armamentarii,2017,38(2):319-325.（in Chinese）
［11］刁爱民，程广利，王泽明. 气枪声源激发的浅海地震波频散特性研究［J］.西北工业大学学报,2019,37（4）:274-279.
DIAO A M, CHENG G L, WANG Z M. On the dispersive characteristics of shallow water seismic waves excited by air gun sound source in shallow water ［J］. Journal of Northwestern Polytechnical University,2019,37（4）:274-279. (in Chinese)
［12］ CHAPMAN D M F，STAAL P R. Experimental observations of interface wave and acoustic propagation over a rough granite seabed ［J］.The Journal of the Acoustic Society of America,1985,77(S1): 29.
［13］ STAAL P R，CHAPMAN D M F. Observations of interface waves and low-frequency acoustic propagation over a rough granite seabed ［J］.Ocean Seismo-Acoustics, 1986, 16: 643-652.
［14］ KATSNELSON B, PETNIKOV V, LYNCH J. Fundamentals of shallow water acoustics［M］. New York:Springer Press，2001.

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