Data Service / Rainfall Frequency Analysis
Spatial Variation Change Rates of Design Storms Rainfall
Rainfall Frequency Analysis to Climate Change
The "Rainfall Frequency Analysis to Climate Change" provides future trend of design storms rainfall for flood prevention planning and soil conservation planning in terms of Intensity-Duration-Frequency (IDF).
Data Production Process
The analysis utilizes TCCIP-AR5 statistical downscaling daily rainfall data from 1310 grids in 5km resolution across Taiwan, including data for the historical baseline period from 1976 to 2005 and projection data for the mid-century period from 2036 to 2065. The analysis calculates the annual maximum rainfall for 1-day, 2-days, 3-days, 4-days, and 5-days durations using the Pearson Type III distribution. Rainfall amounts for different return periods and durations at different grid points are estimated. Subsequently, the change rates relative to the baseline for different return periods and durations at different grid points are calculated. For more details, please refer to the data production process document.
Application Limitations
The "Rainfall Frequency Analysis to Climate Change" only provides future "change rates" for design storms rainfall at corresponding points. It does not provide the amount of current design rainfall or future design rainfall under climate change for those points. This is because that tdata for calculation were from the statistical downscaled daily data of TCCIP and not actual station data. As a result, it only presents changes in design rainfall. All results aim to provide planners with an understanding of the potential impact of climate change on design storms rainfall calculations. However, planning and design applications should still consider climate change uncertainties and associated risks, incorporating climate change adaptation planning.
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The Taiwan Climate Change Projection Information and Adaptation Knowledge Platform (TCCIP) coordinated by National Science and Technology Center for Disaster Reduction (NCDR) is one of three major climate change projects funded by National Science and Technology Council. The TCCIP project not only produces climate change data for impact assessments and adaptations but also aims to support national adaptation policy framework.