Interaction of Southwest Flows and Typhoons on Rainfall Activities over Taiwan

Project Details


In typhoon seasons, typhoons around Taiwan sometimes conduct the southwest flows into Taiwan andbring huge warm and moisture water vapors. Later again induce extreme rainfall events. Some notoriousrainfall disasters in Taiwan typhoon history, such as 3rd September (1981) Flooding, 2nd July (2004)Flooding, and 8th August (2009) Flooding, all are the southwest flowinducedextreme rainfall cases.Therefore, this threeyearsubproject is aimed to use satellite observation to investigate the interactionbetween typhoon circulations and southwest flows, and to construct a rainfall potential model for theserainfalls. Finally, the potential model is expected to be combined with the improved tropical rainfall potentialtechnique (ITRaP)for more comprehensive and accurate typhoon rainfall estimation.The task for the first year is to gather the GSMaP data for typhoon cases, and classify the southwestflowtyphooncases via satellite observations and statistical classification methods. Meanwhile, theproperties and distributions of the rainfalls brought by southwest flows will be investigated. For the secondyear, the tropical rainfall potential scheme will be adopted to establish a model for estimating the southwestflowinducedrainfall over Taiwan Island. Also, the terrain effect and the redistributionfactors will beconsidered. In the third year, the rainfall algorithm will be combined into ITRaP.Besides, the satellitederivedairseaparameters will be used to estimate the water vapor content over the southern ocean to assessin advance the intensity of the southwest flowinducedrainfall. For the second year, mainly the concept andtechniques of the improved tropical rainfall potential techniques for correcting the terrain effect andredistributing the rainfall pattern is focused to get more accurate typhoon rainfalls estimation under thesouthwest flows.
Effective start/end date1/08/1631/07/17

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 11 - Sustainable Cities and Communities
  • SDG 14 - Life Below Water
  • SDG 17 - Partnerships for the Goals


  • Typhoon
  • southwest flow
  • satellite remote sensing
  • rainfall potential


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