Runoff characteristic and its responses to precipitation change in Jinghe River
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Abstract:
Based on the annual runoff and precipitation data of Jinghe Hydrological Station from 1964 to 2012 in Jinghe River，the paper studied the changing trend and multi-time scale correlation between the annual runoff and precipitation by using the methods of Mann-Kendall test, cross-wavelet test and double mass curve, and the effects of the precipitation change on runoff was also quantitatively analyzed. The results showed that runoff increased insignificantly and precipitation increased significantly, respectively. The multi time scale correlativity was significant between the annual runoff and precipitation in Jinghe River, which was dominated by positive correlation. The significantly correlated regions were the 2-4-year periods during 1986-1991, the 7-year periods during 1985-1990, and the 4-5-year periods during 2002-2011. The result of double mass analysis showed that the increases of runoff in JingheRiver was mainly attributed to precipitation change, and its contribution was 68.4%.
Keywords:
runoff ; precipitation ; Mann-Kendall test ; cross-wavelet analysis ; Jinghe River
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