Study on Response Probability of Meteorological and Hydrological Drought Characteristics during Drought Recovery Period in Upper Hanjiang River

It is of great reference significance for drought recovery and water resources management to explore the response rules of meteorological and hydrological drought characteristics during the drought recovery period. In this study, standardized precipitation evapotranspiration index (SPEI) and standardized runoff index (SRI) were used to characterize meteorological and hydrological drought in the upper Hanjiang River basin from 1961 to 2019, respectively. First, the Pearson correlation coefficient method was used to calculate the response time of meteorological and hydrological drought, and the time overlap method was used to match meteorological and hydrological drought events. Furthermore, the characteristics of meteorological and hydrological drought during the drought recovery period were obtained. Finally, a probability model of meteorological and hydrological drought recovery responses based on the Copula function coupled with Bayesian network was established to explore the relationship between meteorolog