Temporal and spatial variation of extreme precipitation in the Longchuan River Basin in 1978-2015 years

Based on the daily precipitation data of 26 meteorological stations in the Longchuan River Basin from 1978 to 2015, the spatial distribution and trend of extreme precipitation events in the Longchuan River Basin were analyzed by trend analysis and Kriging interpolation method. The results showed that the spatial distribution of the annual mean values of each extreme precipitation index in the basin has obvious regional characteristics. The total extreme precipitation, annual precipitation, extreme precipitation days and rainy days in the southwest were higher than those in other regions, however, the extreme precipitation thresholds and daily precipitation intensity were lower than those in other areas, and the opposite occurred in the northeast. In addition to, the interannual variation of the extreme precipitation and daily precipitation intensity showed a trend of growth while the remaining indicators showed a downward trend from 1978 to 2015, indicating that both the precipitation intensity and extreme precipitation in the region increased.