A 2-D KdV equation is derived under condition of arbitrary continuous density profiles. A non-fission version of initial internal solitary waves propagating onto the continental shelf is studied by means of the 2-D Kd...A 2-D KdV equation is derived under condition of arbitrary continuous density profiles. A non-fission version of initial internal solitary waves propagating onto the continental shelf is studied by means of the 2-D KdV equation. Under non-Bohr and Sommerfeld's condition, numerical calculations are carried out based on the KdV equation. The result shows that the initial internal solitary waves in deep ocean break down into internal undular bores on the continental shelf. And the bores have a like-soliton leading fronts and undular trails.展开更多
In a barotropic model the propagation of long-lived anticyclonic Gaussian eddies larger than the radius of deformation over a Gaussian-shaped topography and the merging of the two anticyclonic eddies are investigated ...In a barotropic model the propagation of long-lived anticyclonic Gaussian eddies larger than the radius of deformation over a Gaussian-shaped topography and the merging of the two anticyclonic eddies are investigated by solving the generalized Flierl-Yamagata equation. It is shown that whether or not the basic flow is present, the isolated topography seems to encourage the amplification of an anticyclonic eddy and its southwest movement around the hill In the absence of both the westward flow and the topography, two anticyclonic eddies of identical sizes and amplitudes can merge. However, either the including of the topography or the westward basic flow can make them not merge. In the presence of both, the eddies can merge, but this merging depends on whether the parameter condition is appropriate or not. Therefore, it can be concluded that the topographic forcing might be a possible mechanism for the merging of two anticyclonic eddies.展开更多
A simplified model is proposed to describe the interaction of meddies with a seamount. In the absence of topography, the meddy obtained in this model moves very slowly to the west. However, in the presence of Gaussian...A simplified model is proposed to describe the interaction of meddies with a seamount. In the absence of topography, the meddy obtained in this model moves very slowly to the west. However, in the presence of Gaussian-shaped topography (seamount) the movement of the meddy is strongly controlled by its site. As the seamount is located in the southwest side of a meddy, this meddy will be induced to move southward. But if the seamount is located in the west side of the meddy, the seamount forcing will cause a southwest movement of such a meddy. For two meddies in the absence of seamount, the two meddies will be located on the northwest-southeast axis due to their interaction, which is the natural evolution of two anticyclonic eddies. However, the presence of a seamount will cause the meddies to merge rapidly. This merging is also influenced by the site of the seamount, the closer the seamount is to the two meddies, the faster the two meddies merge. In addition, the direction of the corotating two meddies in the northwest-southeast axis is also influenced by the site of the seamount.展开更多
The remote sensing methods for ship wake detection in SAR image is studied. The detection method for Kelvin ship wake is given by the research of SAR imaging of ship wake. The most oppcared ship wake is turbulent wake...The remote sensing methods for ship wake detection in SAR image is studied. The detection method for Kelvin ship wake is given by the research of SAR imaging of ship wake. The most oppcared ship wake is turbulent wake so the estimation of ship velocity is given using the Radon transform.展开更多
文摘A 2-D KdV equation is derived under condition of arbitrary continuous density profiles. A non-fission version of initial internal solitary waves propagating onto the continental shelf is studied by means of the 2-D KdV equation. Under non-Bohr and Sommerfeld's condition, numerical calculations are carried out based on the KdV equation. The result shows that the initial internal solitary waves in deep ocean break down into internal undular bores on the continental shelf. And the bores have a like-soliton leading fronts and undular trails.
文摘In a barotropic model the propagation of long-lived anticyclonic Gaussian eddies larger than the radius of deformation over a Gaussian-shaped topography and the merging of the two anticyclonic eddies are investigated by solving the generalized Flierl-Yamagata equation. It is shown that whether or not the basic flow is present, the isolated topography seems to encourage the amplification of an anticyclonic eddy and its southwest movement around the hill In the absence of both the westward flow and the topography, two anticyclonic eddies of identical sizes and amplitudes can merge. However, either the including of the topography or the westward basic flow can make them not merge. In the presence of both, the eddies can merge, but this merging depends on whether the parameter condition is appropriate or not. Therefore, it can be concluded that the topographic forcing might be a possible mechanism for the merging of two anticyclonic eddies.
文摘A simplified model is proposed to describe the interaction of meddies with a seamount. In the absence of topography, the meddy obtained in this model moves very slowly to the west. However, in the presence of Gaussian-shaped topography (seamount) the movement of the meddy is strongly controlled by its site. As the seamount is located in the southwest side of a meddy, this meddy will be induced to move southward. But if the seamount is located in the west side of the meddy, the seamount forcing will cause a southwest movement of such a meddy. For two meddies in the absence of seamount, the two meddies will be located on the northwest-southeast axis due to their interaction, which is the natural evolution of two anticyclonic eddies. However, the presence of a seamount will cause the meddies to merge rapidly. This merging is also influenced by the site of the seamount, the closer the seamount is to the two meddies, the faster the two meddies merge. In addition, the direction of the corotating two meddies in the northwest-southeast axis is also influenced by the site of the seamount.
文摘The remote sensing methods for ship wake detection in SAR image is studied. The detection method for Kelvin ship wake is given by the research of SAR imaging of ship wake. The most oppcared ship wake is turbulent wake so the estimation of ship velocity is given using the Radon transform.
