This study aims to figure out satellite imaging mechanisms for submerged sand ridges in the shallow water region in the case of the flow parallel to the topography corrugation.Solving the disturbance governing equatio...This study aims to figure out satellite imaging mechanisms for submerged sand ridges in the shallow water region in the case of the flow parallel to the topography corrugation.Solving the disturbance governing equations of the shear-flow yields the analytical solutions of the secondary circulation.The solutions indicate that a flow with a parabolic horizontal velocity shear and a sinusoidal vertical velocity shear will induce a pair of vortexes with opposite signs distributed symmetrically on the two sides of central line of a rectangular canal.In the case of the presence of surface Ekman layer with the direction of Ekman current opposite to(coincident with) the mean flow,the two vortexes converge(diverge) at the central line of canal in the upper layer and form a surface current convergent(divergent) zone along the central line of the canal.In the case of the absence of surface Ekman layer,there is no convergent(divergent) zone formed over the sea surface.The theoretical results are applied to interpretations of three convergent cases,one divergent case and statistics of 27 cases of satellite observations in the submerged sand ridge region of the Liaodong Shoal in the Bohai Sea.We found that the long,finger-like,bright patterns on SAR images are corresponding to the locations of the canals(or tidal channels) formed by two adjacent sand ridges rather than the sand ridges themselves.展开更多
O431 99021399二维剪切波面重建的有限元模型=Finite elementmodel for the reconstruction of two—dimensionalshearing wavefront[刊,中]/白剑,杨国光(浙江大学现代光学仪器国家重点实验室.浙江,杭州(310027))∥光学学报.—1998,18(...O431 99021399二维剪切波面重建的有限元模型=Finite elementmodel for the reconstruction of two—dimensionalshearing wavefront[刊,中]/白剑,杨国光(浙江大学现代光学仪器国家重点实验室.浙江,杭州(310027))∥光学学报.—1998,18(6).—726-731提出了解析二维剪切波面的有限元方法,建立了二维剪切波面重建的有限元模型。计算机模拟结果表明,有限元法解析二维剪切波面精度高,对剪切波面具有平均作用,对测量误差不敏感,可适用于实时测量。图9表2参10(严寒)展开更多
基金supported by Academician Foundation of China (for Yuan and Zheng)Shanghai Science and Technology Committee Program - Special for EXPO under Grant No.10DZ0581600 and Grant SHUES2011A07 from Shanghai Institute of Urban Ecology and Sustainability(for Zhao)+1 种基金partially supported by US National Sci-ence Foundation Award 0962107 (for Zheng and Liu)Award 1061998 (for Zheng)
文摘This study aims to figure out satellite imaging mechanisms for submerged sand ridges in the shallow water region in the case of the flow parallel to the topography corrugation.Solving the disturbance governing equations of the shear-flow yields the analytical solutions of the secondary circulation.The solutions indicate that a flow with a parabolic horizontal velocity shear and a sinusoidal vertical velocity shear will induce a pair of vortexes with opposite signs distributed symmetrically on the two sides of central line of a rectangular canal.In the case of the presence of surface Ekman layer with the direction of Ekman current opposite to(coincident with) the mean flow,the two vortexes converge(diverge) at the central line of canal in the upper layer and form a surface current convergent(divergent) zone along the central line of the canal.In the case of the absence of surface Ekman layer,there is no convergent(divergent) zone formed over the sea surface.The theoretical results are applied to interpretations of three convergent cases,one divergent case and statistics of 27 cases of satellite observations in the submerged sand ridge region of the Liaodong Shoal in the Bohai Sea.We found that the long,finger-like,bright patterns on SAR images are corresponding to the locations of the canals(or tidal channels) formed by two adjacent sand ridges rather than the sand ridges themselves.
文摘O431 99021399二维剪切波面重建的有限元模型=Finite elementmodel for the reconstruction of two—dimensionalshearing wavefront[刊,中]/白剑,杨国光(浙江大学现代光学仪器国家重点实验室.浙江,杭州(310027))∥光学学报.—1998,18(6).—726-731提出了解析二维剪切波面的有限元方法,建立了二维剪切波面重建的有限元模型。计算机模拟结果表明,有限元法解析二维剪切波面精度高,对剪切波面具有平均作用,对测量误差不敏感,可适用于实时测量。图9表2参10(严寒)
