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Analysis of the Secular Trend of the Annual and Monthly Precipitation Amount of South Korea  

Kim, Gwang-Seob (경북대학교 공과대학 토목공학과)
Yim, Tae-Kyung (주식회사 삼안 수자원부)
Park, Chan-Hee (경북대학교 공과대학 토목공학과 BK21)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.9, no.6, 2009 , pp. 17-30 More about this Journal
Abstract
In this study, the existence of possible deterministic longterm trend of precipitation amount, monthly maximum precipitation, rain day, the number of rain day greater than 20mm, 30mm, and 80mm was analyzed using the Mann-Kendall rank test and the data from 62 stations between 1905 and 2004 in South Korea. Results indicate that the annual and monthly rainfall amount increases and the number of rain days which have more than 80mm rainfall a day, increases. However the number of rain days decreases. Also, monthly trend analysis of precipitation amount and monthly maximum precipitation increases in Jan., May, Jun., Jul., Aug., and Sep. and they decrease in Mar., Apr., Oct., Nov., and Dec. Monthly trend of the number of rain day greater than 20mm, 30mm, and 80mm increases in Jun., Jul., Aug., and Sep. However results of Mann-Kedall test demonstrated that the ratio of stations, which have meaningful longterm trend in the significance level of 90% and 95%, is very low. It means that the random variability of the analyzed precipitation related data is much greater than their linear increment.
Keywords
Precipitation; Mann-Kendall test; Trend Analysis; Significance level;
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Times Cited By KSCI : 4  (Citation Analysis)
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