Table 5: The runoff -test result table.

Control stationVariation point (preliminary) ( = 0.1)Significance

WX1961 = 121.782−1.073No
2004 = 81.861.6179No

YC1961 = 121.782−1.8796Yes
1972 = 181.7341.2775No
2000 = 161.7460.7716No

LS1961 = 121.782−0.3625No
2004 = 81.862.317Yes

WHG1963 = 161.746−0.2358No
2004 = 81.861.982Yes

HK1988 = 181.734−1.9719Yes

DT1968 = 181.734−0.6975No
1972 = 181.7340.3123No
2004 = 81.862.9108Yes