Study on the characteristics of meteorological and hydrological droughts in Xin'an River Basin and their relationship
Xin'an River Basin is a typical water-abundant area.Characteristics exploration of the drought events and study on the re-sponse of hydrological drought to meteorological drought in Xin'an River Basin largely benefits the scientific reference for basin water management.This study calculated the Standardized Precipitation Index(SPI)and Standardized Runoff Index(SRI)with the monthly data of inflow runoff and precipitation from 1960 to 2022 in Xin'an River Basin.Based on SPI and SRI,the evolution of meteorological and hydrological droughts under different time scales and the seasonal response of hydrological drought to meteorological drought were analyzed.The results are as follows:(1)From 1960 to 2022,meteorological and hydrological droughts in the Xin'an River Basin mainly occurred in the 1960s,late 1970s to mid-1980s and early 2000s.Meteorological and hydrological droughts have rarely occurred since the 21st century;dry and wet alternated frequently over the remaining periods of time.(2)Mann-Kendall trend test results show a wet-ting trend during the past 63 years,and the effects of drought have mitigated.While in winter and summer,it showed drought decreas-ing trend in the basin.The hydrological trend of becoming wet was more obvious than that of meteorological.(3)The correlation be-tween hydrological drought and meteorological drought in Xin'an River is high.Also,the hydrological drought lags behind the meteoro-logical drought for 1-3 months.The seasonal response of hydrological drought to meteorological drought in flood season shows higher correlation and faster speed than that in dry season.Because of the quick response of hydrological drought to meteorological drought in flood season,more focus and targeted steps should be taken on the drought state of the basin in the flood season.
Xin'an River BasinStandardized Runoff IndexMann-Kendall non-parametric testdrought response
NETL
NSTL
万方数据
