The Research on the Simulation and Analysis of Typhoon Soulik(2013)
| Autor: | Ke-Yang Lu, 陸可揚 |
|---|---|
| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 The tropical area of North-West Pacific located in the warmest warm-pool of West Pacific, which provides sufficient vapor through warm seawater. Meanwhile, the southwestern monsoon by the low level of South Asia in summer convergence toward the eastern wind from East Pacific offers the low level vorticity turbulence for the essence of typhoon, which guides the northwestern Pacific with frequent typhoon in the world. Furthermore, the location of Taiwan is on the main moving path of typhoon. Taiwan happens to be at the main route of typhoon. Typhoon affects Taiwan dramatically as well as one of the major natural calamities. Mountain chains dominate Taiwan island with complex topography, which not only deviate the path of typhoon, but also change the velocity, and the inside structure of convection the distribution of wind field and rainfall as well ; then, these increase the uncertainty and difficulty of typhoon forecasting. Analyzing intensity, structure, moving path, variation of precipitation of Typhoon Sulik, and influence of Taiwan’s topography, this research uses WRF model to simulate Typhoon Sulik emerged in Taiwan in 2013 with different models .The result indicates that the sequent moving of Typhoon Sulik towards Northwest was directed by 850hPa to 300hPa’s average steering field. Before approaching Taiwan, the topography guided the moving path to West; if without topography, this phenomenon would not exist. If simulating by Keesler and WSM6 of Cloud Microphysics Parameterization, the landing path would turn to South comparing to the hypothetical experiments, and typhoon’s structure would be asymmetric after destroying by the topography with revolutionary weakening on intensity soon after landfall. The structure was recomposed with stronger intensity when typhoon’s center moved into Taiwan Strait. Regarding the simulative intensity of Cloud Microphysics Parameterization, Keesler’s warm-cloud performs the strongest while second for WSM6, and the weakest for WSM3 during the hypothetical experiments. On the aspect of precipitation simulating, the convective rain band in southern part of typhoon center develops more actively. The asymmetric rain band caused by the topography after landfall is located in the South of typhoon center. The rain band, moving from Taiwan Strait to Taiwan with orographic lifiting by the topography, provokes strong convection in mountain areas. However, different simulated paths of experiments have slight differences and with changes between typhoon’s circulation and topography; therefore, the raining intensity and location can be different. Besides, Cloud Microphysics Process also affects the precipitation with the strongest intensity on the Keesler warm cloud mode and stronger on the WSM6 hails mode; which are determined by different settings of transforming process on ice crystal, and the process of hail into rain drops. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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