Preliminary Study And Sensitivity Experiments On The Impact Of Different Initial Vortex Profile On Vortex Self-organization

Within the framework of vortices self-organization dynamics, the effect of different vorticesprofile interactions was preliminarily investigated. In the first place, the mechanism oftwin-vortices profile and terrain interactions on vortices self-organization was numericallystudied based on aβ-plane 2-D quasi-geostrophic barotropical model with the topographic term,and the self-organizations' characteristic of different twin-vortices forming into a single vortexwas contrasted. The results showed that the vortices with Gauses, double-logarithm, double-sine,parabola and condensation profile could merge into a meso-αscale vortex due to the impact ofterrain. Different initial vortex profiles could influence the process of self-organization, such asits speed. The spiral bands appeared earlier and the merge process was faster with Double-sineand parabola vortex profile. On the other hand, although the spiral band of condensation vortexprofile appeared early as well, it spent more time to merge into a single vortex. The differentinitial vortex profile could affect the attribute of quasi-terminative vortex, including the extent ofaxisymmetric, complexity, and the shape of wind profile.In addition, the experiment of twin-vortex interaction with different intensities and theterrain's sensitivity test were carried out to explore the influence of terrain and the variability ofvortex intensity on twin-vortex self-organization process. The results suggested that diverseterrain scale could impact the velocity of twin-vortex rotation with Gauses profile obviously,while the change of terrain height could influence the location of quasi-terminative vortex. Whenthe initial distributions of intensity are different, the self-organization processes are dissimilarlybecause of the interaction between twin-vortex and negative vortex over terrain. For the initialdistribution of eastern stronger vortex and western weaker vortex, the weaker vortex will mergeinto the stronger one, as for the initial distribution of eastern weaker vortex and western strongervortex, the weaker vortex would not merge into the stronger one completely, some part of theweaker vortex will move to the north of terrain and form into a Iittle vortex area.Self-organization is a typical nonlinear process and embodies the complexity of natural science. This research is carried out in the frame of the vortex self-organization. Diabatic heating,vertical structure of the vortex and environmental stratification are not considered, which arepending further study.