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dc.contributor.authorZheng, Quananzh_CN
dc.contributor.authorLi, Lizh_CN
dc.contributor.authorGuo, Xiaogangzh_CN
dc.contributor.authorGe, Yongzh_CN
dc.contributor.authorZhu, Dayongzh_CN
dc.contributor.authorLi, Chunyanzh_CN
dc.contributor.author朱大勇zh_CN
dc.date.accessioned2015-07-22T03:12:05Z
dc.date.available2015-07-22T03:12:05Z
dc.date.issued2006-09-23zh_CN
dc.identifier.citationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 2006,111(C9)zh_CN
dc.identifier.otherWOS:000240828400004zh_CN
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/87832
dc.description.abstract[ 1] The satellite synthetic aperture radar (SAR) images display wave-like patterns of the ocean bottom topographic features at the south outlet of Taiwan Strait (TS). Field measurements indicate that the most TS water body is vertically stratified. However, SAR imaging models available were developed for homogeneous waters. Hence explaining SAR imaging mechanisms of bottom features in a stratified ocean is beyond the scope of those models. In order to explore these mechanisms and to determine the quantitative relations between the SAR imagery and the bottom features, a two-dimensional, three-layer ocean model with sinusoidal bottom topographic features is developed. Analytical solutions and inferences of the momentum equations of the ocean model lead to the following conditions. ( 1) In the lower layer, the topography-induced waves ( topographic waves hereafter) exist in the form of stationary waves, which satisfy a lower boundary resonance condition sigma = kC(0), here sigma is an angular frequency of the stationary waves, k is a wavenumber of bottom topographic corrugation, and C-0 is a background current speed. ( 2) As internal waves, the topographic waves may propagate vertically to the upper layer with an unchanged wavenumber k, if a frequency relation N-3 < sigma < N-2 is satisfied, here N-2 and N-3 are the Brunt-Waisala frequencies of middle layer and upper layer, respectively. ( 3) The topographic waves are extremely amplified if an upper layer resonance condition is satisfied. The SAR image of topographic waves is derived on the basis of current-modulated small wave spectra. The results indicate that the topographic waves on SAR images have the same wavelength of bottom topographic corrugation, and the imagery brightness peaks are either inphase or antiphase with respect to the topographic corrugation, depending on a sign of a coupling factor. These theoretical predictions are verified by field observations. The results of this study provide a physical basis for quantitative interpretation of SAR images of bottom topographic waves in the stratified ocean.zh_CN
dc.language.isoen_USzh_CN
dc.publisherJ GEOPHYS RES-OCEANSzh_CN
dc.source.urihttp://dx.doi.org/10.1029/2006JC003586zh_CN
dc.subjectSYNTHETIC-APERTURE RADARzh_CN
dc.subjectSUBMARINE SAND WAVESzh_CN
dc.subjectCHINA SEAzh_CN
dc.subjectMODELzh_CN
dc.subjectTEMPERATUREzh_CN
dc.subjectMODULATIONzh_CN
dc.subjectCURRENTSzh_CN
dc.subjectIMAGERYzh_CN
dc.subjectWINDzh_CN
dc.subjectEASTzh_CN
dc.titleSAR imaging and hydrodynamic analysis of ocean bottom topographic waveszh_CN
dc.typeArticlezh_CN


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