Assessment of hydrological extremes in the Kamo River Basin,Japan |
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| Authors: | Maochuan Hu Takahiro Sayama Weili Duan Kaoru Takara Bin He Pingping Luo |
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| Affiliation: | 1. Water Resources Research Center, Disaster Prevention Research Institute, Kyoto University, Uji, Japan;2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Nanjing, China;3. Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, School of Environmental Science and Engineering, Chang’an University, Xi’an, China |
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| Abstract: | A suite of extreme indices derived from daily precipitation and streamflow was analysed to assess changes in the hydrological extremes from 1951 to 2012 in the Kamo River Basin. The evaluated indices included annual maximum 1-day and 5-day precipitation (RX1day, RX5day), consecutive dry days (CDD), annual maximum 1-day and 5-day streamflow (SX1day, SX5day), and consecutive low-flow days (CDS). Sen’s slope estimator and two versions of the Mann-Kendall test were used to detect trends in the indices. Also, frequency distributions of the indices were analysed separately for two periods: 1951–1981 and 1982–2012. The results indicate that quantiles of the rainfall indices corresponding to the 100-year return period have decreased in recent years, and the streamflow indices had similar patterns. Although consecutive no rainfall days represented by 100-year CDD decreased, continuous low-flow days represented by 100-year CDS increased. This pattern change is likely associated with the increase in temperature during this period. EDITOR D. KoutsoyiannisASSOCIATE EDITOR E. Gargouri |
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| Keywords: | extreme indices precipitation streamflow trend frequency |
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