Analysis of Spatiotemporal Evolution of Isolated Rainstorm Events in Huai River Basin, China

Table 3

Mutation and trend analysis of each index.

Mutation year		Before mutation	After mutation	Standard statistics	-value	Trend analysis
Intensity (1990)	Min	4.08	3.89	1.645 ( = 0.05)	−1.652↓	Significant decrease
	Max	7.82	10.58
	Mean	5.61	5.13
Precipitation (2003)	Min	75.14	71.45	1.645 ( = 0.05)	0.705↑	No significant increase
	Max	97.32	109.17
	Mean	85.68	87.34
Duration (2003)	Min	14.81	14.86	1.645 ( = 0.05)	1.227↑	No significant increase
	Max	24.73	28.65
	Mean	19.00	20.54
Frequency (2003)	Min	2.02	1.26	1.645 ( = 0.05)	0.632↑	No significant increase
	Max	4.15	5.20
	Mean	2.81	3.47