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Spatial and Temporal Trend Analysis of Precipitation and Drought in South Korea

1
Department of Agricultural and Rural Engineering, Chungbuk National University, Cheongju 28644, Korea
2
K-Water Research Institute, Daejeon 34045, Korea
3
Chungbuk Research Institute, Cheongju 28517, Korea
4
National Crisis and Emergency Management Research Institute, Chungbuk National University, Cheongju 28644, Korea
*
Author to whom correspondence should be addressed.
Water 2018, 10(6), 765; https://doi.org/10.3390/w10060765
Received: 19 April 2018 / Revised: 8 June 2018 / Accepted: 8 June 2018 / Published: 12 June 2018
(This article belongs to the Section Hydrology)
High spatial and temporal variation in precipitation in South Korea leads to an increase in the frequency and duration of drought. In this study, the spatial characteristics of temporal trends for precipitation and drought severity time series were analyzed at 55 stations across South Korea for the period 1980–2015. This study also reviewed the usefulness of different trend tests while addressing the issue of serial correlation, which has often received less attention in previous studies. Results showed that most significant trends in precipitation were detected along the south coast of South Korea, especially during winter, late spring and summer, whereas no significant trend was detected in annual precipitation. The Sen’s slope of the trends increased from January to August and decreased from August onward. Principal component analysis applied on Standardized Precipitation Index (SPI) at a 12-month time scale divides the whole of South Korea into four subregions with different temporal behaviors of drought severity. Moreover, drought severity showed a significant increasing trend, mainly on the northeast coast. Drought frequency analysis showed more frequent droughts in late winter, early spring and early autumn, with less frequent droughts in summer. View Full-Text
Keywords: spatial; temporal; drought severity; precipitation; serial correlation; drought frequency spatial; temporal; drought severity; precipitation; serial correlation; drought frequency
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MDPI and ACS Style

Azam, M.; Maeng, S.J.; Kim, H.S.; Lee, S.W.; Lee, J.E. Spatial and Temporal Trend Analysis of Precipitation and Drought in South Korea. Water 2018, 10, 765.

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