Spatio-temporal analysis of precipitation concentration index at different time scales in Gaoping region, Taiwan

Hsien Ting Huang, Hsin Fu Yeh

Research output: Contribution to journalArticlepeer-review

Abstract

In recent years, climate change has altered rainfall distribution worldwide. In addition, it has made Taiwan’s wet and dry seasons increasingly distinct, affecting the availability of water resources. Thus, analyses of yearly rainfall time and rainfall spatial distribution is crucial to future flood control and prevention as well as local water resource management. In Taiwan, because changes in the wet and dry seasons are most pronounced in its southern regions, this study used the precipitation concentration index (PCI) to analyze changes in the daily, seasonal, and annual rainfall between 1982 and 2015; the data analyzed were obtained from 16 rainfall stations in the Gaoping region. Additionally, the Mann-Kendall test was employed to identify changes in PCI over time. Daily results obtained from all rainfall stations showed that precipitation became more concentrated (i.e., becoming stronger and occurring in a smaller number of days), particularly in the southeastern area of the Gaoping region. Seasonal results showed that the PCI ranged from 16 to 17 in the winter and 14–15 in the other seasons, indicating moderate concentration. Yearly results showed that the PCI ranged mostly from 18 to 25, signifying extremely concentrated rainfall and nonuniform rainfall distribution. Moreover, yearly rainfall test results showed increasing rainfall trends in the overall research regions, where 37.5% (6 of 16) rainfall stations displayed significant increases. In the spring, 68.8% (11 of 16) rainfall stations showed decreasing rainfall, whereas in the summer, 75% (12 of 16) rainfall stations showed increasing rainfall. The results of this study can be used in water resource management to manage, control, and prevent floods and predict possible future droughts.

Original languageEnglish
Pages (from-to)52-63
Number of pages12
JournalJournal of Taiwan Agricultural Engineering
Volume65
Issue number3
DOIs
Publication statusPublished - 2019 Sept

All Science Journal Classification (ASJC) codes

  • General Agricultural and Biological Sciences
  • General Engineering

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