Analysis of Variation Trends in Precipitation in an Upstream Catchment of Huai River

Table 1

Values of Z of the M-K test, the Kendall slope β, and H of the R/S analysis for monthly, seasonal, and annual series.

Time	𝑍	𝛽 (mm/a)	H
January	−0.74	−0.036	0.452
February	0.48	0.037	0.556
March	0.13	0.015	0.689
April	−1.32	−0.269	0.754
May	1.41	0.489	0.634
June	1.51	0.546	0.534
July	1.21	0.760	0.562
August	−0.17	−0.131	0.512
September	0.82	0.205	0.687
October	−0.68	−0.168	0.623
November	−1.26	−0.240	0.546
December	−0.34	−0.026	0.641
Spring (3–5 month)	0.13	0.077	0.595
Summer (6–8 month)	0.49	0.637	0.596
Autumn (9–11 month)	−0.29	−0.177	0.620
Winter (12–2 month)	0.03	0.012	0.560
Flood season (6–9 month)	−0.08	−0.232	0.595
Major flood season (7-8 month)	0.18	0.158	0.595
Nonflood season (10–5 month)	−0.41	−0.269	0.615
Annual	0.08	0.050	0.447