Influence of Global Warning on Characteristics of Rainfall Events in Taiwan
Date Issued
2011
Date
2011
Author(s)
Liao, Chun-Che
Abstract
Recently, it is recognized that climate change is occurring in many regions around the world due to the green house effect. In order to evaluate the impact under global climate change and management strategies, we divide the rainfall data of Taiwan and Zengwun basin into two parts. First part of the research, all rainfall data is divided into 4 different rainfall types : frontal rain, Mei-Yu, convective storm and typhoon from 1961 to 2010 and more than recently 20 years, respectively. Then analyzing the characteristics of the 4 rainfall types. The characteristics of rainfall include the frequency of annual rainfall, the average duration, the maximum duration, the standard deviation of duration, the average rainfall, the maximum rainfall, the average intensity, and maximum intensity. The relation between the characteristics of rainfall events and the global average temperature shows that if the global average temperature continues to increase, the rainfall frequency in Taiwan would be decreasing out of summer.
Another part including Mann-Whitney-Pettitt (MWP), Kruskal-Wallis(KW) variance analysis, Mann-Kendall(MK) rank correlation, and Cumulative deviation (CD) methods were employed to test the average and variance of trend existences in frequency of annual rainfall, average duration, maximum duration, standard deviation of duration, average rainfall, maximum rainfall, average intensity , maximum intensity of rainfall event. The results of the study reveal that the rainfall frequency in Taiwan is decreasing out of summer. And the rainfall and intensity from typhoon event in Zengwun basin is increasing.
Subjects
change existence test
statistical method
rainfall event
climate change
joint normal distribution
SDGs
Type
thesis
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