Hydrological drought dynamic using copula functions and drought center migration in the Ganjiang river basin.

In addition, the results found that the D and S of hydrological drought events exhibited a decreasing trend, followed by an increasing trend, intensified after the 1990 s, which was consistent with the findings of Han, et al. 31 .

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It can be seen that the average drought conditions were alleviated from the 1960 s to the 1990 s in the GRB, while from the 1990 s to the 2010 s, the average D , S , and P began to show an increasing trend.

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