| Numerical simulations and experiment ofreverberation loss in shallow water |
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| 作者姓名： | ZHANG Renhe LI Wenhua QIU Xinfang and JIN Guoliang |
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| 作者单位： | State Key Laboratory of Acoustics. Chinese Academy of Sciences. Beijing，100080 |
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| 摘 要： | I.IntroductionUndcrwatersoundrevcrberationhasrccentlybecomeatopicofgreatinterestlI-3l.Sincethcrcverberationincludescombincdeffcctsofsoundpropagahonandscattering,andthesoundpropagationinshallowwaterismuchmorecomplicatedthanthatinthedeepsea,itisnecessarytOstudycarefullybothintheoryandexperimcnt.Fortheshortrangereverberationinshal1owwatcrtheray-basedmodelisavai1ab1e,whilefOr1ongrangethewave-basedmodelmustbeusedbecauscofcomp1icatcdmu1tipaths,refractioneffcctsandfrequencydependence.Thenorma1-mode…
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Numerical simulations and experiment of reverberation loss in shallow water |
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| Authors: | ZHANG Renhe LI Wenhua QIU Xinfang and JIN Guoliang |
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| Abstract: | In this paper, the reverberation loss is taken as a normalized physical quantity to describe the shallow-water reverberation, and reverberation loss versus time was calculated by using three models: the ray-based model, the WKBZ mode models taking and not taking the effects of complex eigenvalues into account. Numerical simulations show that the effects of complex eigenvalues can not be neglected, and at medium ranges the reverberation loss from the ray-based model is consistent with that from the WKBZ mode model taking the effects of complex eigenvalues into account.The experimental results show that the reverberation loss is not dependent on the bandwidth. The reverberation in shallow water with a thermocline shows strongdepth dependence, and the theorctical geometricmean rule of reverberation intensity was demonstrated by experiment. |
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| Keywords: | Reverberation Normal mode WKBZ approach Shallow water |
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