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Geoscience Letters

Official Journal of the Asia Oceania Geosciences Society (AOGS)

Table 6 The time period and the gradation standards of annual runoff and annual precipitation time series in Yangtze River basin (excluding Taihu Lake basin)

From: Correlation-aided method for identification and gradation of periodicities in hydrologic time series

Time period

Significance level

1956–2017

0 ≤ |r| < 0.250a

0.250 ≤ |r| < 0.325a

0.325 ≤ |r| < 0.6

0.6 ≤ |r| < 0.8

0.8 ≤ |r| < 1

No (N)

Weak (W)

Moderate (M)

Strong (S)

Dramatic (D)

  1. aFor the annual time series with the length of 62 years, the thresholds of correlation coefficient are set as r0.05 = 0.250, r0.01 = 0.325, 0.6 and 0.8 to give five-level assessment
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