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| Titel |
Interaction among Typhoon track, Asymmetrical Rainfall, and Taiwan Topography: A Case Study of Fanapi (2010) |
| VerfasserIn |
C.-C. Wang, Y.-H. Chen |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250064654
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| Zusammenfassung |
| Typhoon Fanapi (2010) was a westward-moving typhoon that made landfall and
passed through Taiwan on 19 September 2010. With a peak 24-h rainfall of 1080
mm, it caused serious flooding over the coastal plains in southwestern Taiwan,
including the city of Kaoshiung. Being a relatively small tropical cyclone (TC),
Fanapi (2010) developed an asymmetrical rainfall pattern when and after it crossed
the Central Mountain Range (CMR) of Taiwan, with most rain in the southern to
southeastern quadrants. Meanwhile, upon leaving Taiwan, the TC showed a significant
reduction in translation speed temporarily for 12 h, from about 22 km h-1 to 13 km
h-1.
Numerical experiments were carried out for Fanapi using the Cloud-Resolving Storm
Simulator (CReSS) of Nagoya University at 3-km horizontal grid spacing and the National
Centers of Environmental Prediction (NCEP) global analyses (at 1Ë latitude/longitude
and 6-h resolution) as initial and boundary conditions (IC/BCs). Sensitivity tests
starting at 0600 UTC 19 Sep, when the TC was crossing CMR, with varying water
vapour amount and terrain height of Taiwan were performed. The results indicate that
the asymmetrical latent heating (LH) effect, induced by the topography, also had
significant impact on the track over a 9-h period and subsequent rainfall distribution: The
model TCs with less moisture (and less asymmetry in LH) move faster (up to 24.3
km h-1) and more toward the northwest (at 305Ë ) upon leaving Taiwan, while
the TC in the control run (with full moisture and terrain) move at a slower speed
(17.4 km h-1) and more toward the west (at 280Ë ), both of which are closer to the
observation.
The above simulation results of Fanapi are compared to those of Typhoon Morakot
(2009), which was a much larger and slower-moving TC that also exhibited asymmetrical
rainfall pattern. Morakot (2009) caused the most serious damages over Taiwan in the past 50
years. |
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