Rules of Runoff Variation in Luanhe River Basin in Recent 50 Years
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Abstract:
On the basis of the natural runoff data at the Goutaizi, Sandaohezi, and Luanxian stations in the Luanhe River Basin from 1950 to 2009, the long-term trend of runoff was analyzed using the moving average method, Mann-Kendall test method, and wavelet analysis method. The results showed that (1) the runoff at the three stations have a decreasing trend from 1950 to 2009; (2)a mutation of runoff reduction happened at the Goutaizi station in 1960, at the Sandaohezi station in 1967, and at the Luanxian station in 1988, which may be caused by the extreme weather events; and (3) a 28-year variation cycle existed in the upstream of Luanhe River, a 27-year variation cycle in the midstream of Luanhe River, and a 30-year variation cycle in the downstream of Luanhe River.
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