Characteristics of the precipitation variation in Huaihe River Basin during 1960-2010

With linear regression method, the accumulative anomaly curve method, Mann-Kendall trend and mutation test, spatial and temporal characteristics of precipitation variation are analyzed by using precipitation data of 25representative stations in Huaihe River Basin during 1960-2010. The results indicate that a slight increase in annual precipitations of Huaihe River Basin generally, but a decrease trend was maintained all the time during intermediate years and mutation starting year is 1965; On a spatial scale, the precipitation decreased gradually from south to north in Huaihe River basin. Upstream and midstream mostly show an ascendant trend, and downstream almost presents an increasing trend. The precipitation trend and mutation characteristics on space and time are analyzed, which provide the reference for the flood disaster prevention in Huaihe River basin.

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