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《Acta Oceanologica Sinica》 2012-01
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The effect of ocean mixed-layer structure on acoustic propagation in a surface duct environment

ZHANG Xu1,ZHANG Yonggang2,ZHANG Jianxue3,DONG Nan2(1.Unit 91550 of PLA,Dalian 116023,China;2.Department of Scientific Research,Dalian Naval Academy,Dalian 116018,China;3.Institute of Marine Environment,Ocean University of China,Qingdao 266003,China)  
Based on WOA05 climatological database and the measured hydrologic data in the northern Huanghai Sea,the effect of typical mixed-layer structures on the acoustic propagation in a surface duct environment in adjacent sea areas of China is discussed using the BELLHOP Gaussian beam model.The mixed-layer structures show distinct variations between different areas and seasons.In the deep sea,the mixed-layer depth is a main variable factor,which defines the vertical space of the surface duct.A obvious difference of acoustic energe level appears when the propagation occurs in a surface channel inside the mixed-layer compared with that in a shadow zone outside the mixed-layer.In the shallow water,the mixed-layer depth and the sound speed grads are both streaky.More reversal rays are involved when the sound speed grads enhancing or the mixed-layer depth deepening,which make the energe level in the surface duct increased.Two groups of measured data show that the mixed-layer depth may yield or fade suddenly with time and distribute asymmetrically with range.Under a thermocline enviroment in the shallow water,the acoustic energy level near the surface can be evidently raising when the surface duct comes into being in condition of some specific oceanographic phenomena in the air-sea boundary layer.
【CateGory Index】: TB56
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