Spatial-temporal Variation Characteristics of Extreme Precipitation in Panlong River Basin

PurposesTo study the spatial-temporal characteristics of extreme precipitation of Panlong River Basin.

MethodsBased on the daily precipitation data of 19 precipitation stations in Panlong River Basin from 1978 to 2016, the extreme precipitation events were defined according to the percentile method, and the annual extreme precipitation, precipitation time and precipitation intensity were selected to identify region and time distribution features of extreme precipitation by using linear regression, Mann-Kendall, wavelet transform and EOF.

ResultsIn time, the extreme precipitation, precipitation time and precipitation intensity of Panlong River Basin over the past 40 years all showed a rising trend, and a sudden change occurred in 2012; extreme precipitation and precipitation time had periodic changes of about 6 a, 9 a and 15 a, precipitation intensity had periodic changes of about 7 a, 15-17 a, and 15 a was the main cycle of the three indicators. Spatially, the annual extreme precipitation was mainly consistent in the whole region, and the time and intensity of extreme precipitation were also consistent in the whole region except for individual stations. On the whole, the three indicators showed a decreasing trend from south to north.

ConclusionAffected by the Pacific subtropical high, the flood disaster in the Panlong River Basin, especially in the south, will be more severe in the future, which will bring challenges to the flood control and disaster reduction of the Panlong River Basin. It is necessary to further improve the ability of disaster risk management and coping with climate change.