Numerical Study of Topographic Effect on Rainfall Reinforcement Associated with Tropical Cyclone Talim (2005)

摘要

@@ 1. Introduction Observational evidence (Chen and Ding, 1979; Tao et al.. 1980; Chen, 2007) has shown that tropical cyclones (TC) often bring about torrential rains when they make landfall. When a TC weakens into a remnant, rainfall would be decreased correspondingly. Howe'ver, in some cases, the remnant will be reviviscent and produce even heavier rainfall than it in landfall time. Such a phenomenon is known as Rainfall Reinforcement associated with Landfalling Tropical Cyclones (RRLTC; Fan et al., 1996). Because of the occurrence of RRLTC often under complex atmospheric environments, the prediction of RRLTC has always been a challenge to forecasters. As a result, it may induce tremendous disasters. Statistical research reveals that rainfall centers have a close relation with topography as mainly locating in coastal lines vicinity, the eastem and southem slopes of the Mountains (Dong et al., 2010). Typhoon Talim (2005) is a good case to investigate topographic effect on the rainfall reinforcement, which induced the strongest rainfall reinforcement so far in China and the rainfall center just situates in the east slope of Da-bie Mountains. In this paper, we will present results from simulation to understand the terrain impact.