Analysis of characteristics of Rainfall-Runoff variations and its influencing factors for the Yongding River basin
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Abstract:
Using the recording of runoff series of Shixiali, Xiangshuibao, Guanting reservoir gauge station in Yongding River basin among 1956-2003, Mann-kendall test, Pettitt test, Moving-T test and Wavelet analysis are applied to characterize the runoff trend, periodicity and mutation, the influencing factors are discussed as climate change and human activities. The results showed that 1) annual runoff of Yonding River Basin was declining significantly among 1956-2003, 2) it had a major period of 21-year, and 3) runoff varied abnormally in 1982-1983. The variations of runoff were mainly influenced by human activities like land use, dam construction and groundwater exploitation, climate change also has an impact on the runoff decline.
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