Interaction of Southwest Flows and Typhoons on Rainfall Activities over Taiwan(Iii)

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 flow‐induced extreme rainfall cases.Therefore, this three‐year subproject 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 (I‐TRaP) for more comprehensive and accurate typhoon rainfall estimation.The main tasks for the first year were to gather the satellite microwave observation data and GSMaPdata for typhoon cases, and classify the southwest flow‐typhoon cases via satellite observations andstatistical classification methods. Meanwhile, the characteristics and distributions of the rainfalls brought bysouthwest flows were investigated. For the second year, the tropical rainfall potential scheme was adopted toestablish a model for estimating the southwest flow‐induced rainfall over Taiwan Island, and analyzed therainfall characteristics before/during/after typhoons hitting Taiwan Island. Also, the terrain effect and the redistributionfactors were considered. In the third year, the rainfall algorithm will be combined into I‐TRaP.Besides, the satellite‐derived air‐sea parameters will be used to estimate the water vapor content over thesouthern ocean areas to assess in advance the intensity of the southwest flow‐induced rainfall. For the lastyear, the role of the southwest flows on the typhoon rainfall activity will be investigated mainly and use theinformation to improve I-TRaP to get more accurate rainfall potentials under the southwest flows.
Effective start/end date1/08/1731/07/18

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 14 - Life Below Water
  • SDG 15 - Life on Land
  • SDG 17 - Partnerships for the Goals


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


Explore the research topics touched on by this project. These labels are generated based on the underlying awards/grants. Together they form a unique fingerprint.