Physics – Fluid Dynamics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dfd.dn003c&link_type=abstract
American Physical Society, 53rd Annual Meeting of the Division of Fluid Dynamics November 19 - 21, 2000 Washington, DC Meeting I
Physics
Fluid Dynamics
Scientific paper
Motivated by the disaster of typhoons encountering the island of Taiwan, the underlying dynamical features were explored by a joint laboratory experiment and numerical computation of an ideal barotropic vortex interacting with a 3-D elliptic hill on a beta plane. Experimental parameters in the rotating tank experiment were carefully determined according to similarity laws derived from the conservation of potential vorticity. The salient behavior of the vortex motion driven by the beta gyre was the overall northwestward translating tendency. During the interaction with the topography, the trajectory of the vortex was deflected by an additional topographic beta effect. Fundamental mechanisms associated with this vortex/topography interaction revealed the cooperative or competitive relationship between the planetary and topographic beta effects. For instance, these two beta forces cooperated with each other on windward side enhancing the uphill climbing of the vortex. On the leeward side, in general, the topographic beta effect decelerated the downhill movement of the vortex driven by the planetary beta. A shallow water model was also adopted to calculate the flow field numerically by the MPDATA algorithm. Under the same initial conditions, close agreements were observed between the computational and experimental results. *supported by NSC, ROC under NSC 89-2111-M-002-016-AP1.
Chang Chien-Cheng
Chen Hong-Jeng
Chu Chin-Chou
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