Study On The Process Of Typhoon Vortex Self-organization

The vortex self-organization is the priority research subject of the internationalvortex dynamic conference in 2003. In the context of vortex self-organizationdynamics, there are some achievements for the double-and multi-vorticesself-organization, the effect of diffirent initial vortex parameters on the vortexself-organization, multi-scale vortex self-organization process, and complexity anddiversity of self-organization presently. Based on these achievements, further studieson the typhoon vortex self-organization have been made by numerical simulation anddiagnostic methods. The main results as follows:Firstly, based on the MM5, ten numerical experiments have bee made. Inexperiment 1, there is no a small vortex with a radius of 80kin, and the two separatedmeso-scale vortices with a radius of 500km exclude from each other duringco-rotation, and finally, the distance between the two meso-scale vortices increases.There are a small vortex and two meso-scale vortices in the initial field of experiment2. The only difference between Experiment 2 and 1 is that a small vortex is added inthe initial field of experiment 2. The aim of experiment 2 is to study two separatedvortices in initial field approach each other during co-rotation, and then self-organizeinto a typhoon-like and larger-scale vortex consisting of inner area and spiral bands.Subsequently, we choose 3 typhoon cases which produce heavy disaster on Chinato study the effect of the vortex self-organization on the typhoon formation withdiagnostic method. They can be divided two categories for the processes of 3 typhooncases formation. The double vortices self-organization process controls the formationsof the number 5 typhoon named Haitang in 2005 and the number 1 typhoon namedChannun, and the formation processes of the number 15 typhoon named Khanun in2005 are manipulate by the process of multi- vortices self-organization.Finally, the role of the vortex self-organization between meso- and small-scalevortices and storm vortex in the amplification of the rainstorm for the 4th stormnamed Bilis in 2006 has been analyzed. The diagnostic results of relative vorticiy,vertical velocity, and TBB of FY2C show that the interaction between storm and several mesoo and small-scale vortices in southwest of Bilis storm is one of the mainreasons resulting in the dramatic increase of torrential rain related to Bilis storm.The study on the questions about typhoon's formation, abrupt amplification oftyphoon's rainstorm just start in the context of the theories of typhoons's fine andsophisticed structure and vortex self-organization dynamics. The present dissertationjust offers preliminary results, which does not cover all the issue of typhoon vortexself-organiztion involving many sophisticated physical mechanisms. We will continuemake further research on this topic in the future work.