Analysis of Precipitation Characteristics in the Haihe River Plain from 1956 to 2011
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Abstract:
Based on the average monthly precipitation data collected at 28 Level-4 sub-segments in the Haihe River Plain from 1956 to 2011, the variation characteristics of precipitation in the Haihe River Plain were analyzed using the methods of linear regression, Mann-Kendall trend test, and Morlet wavelets analysis method. The results showed that (1) the average precipitation in the Haihe River Plain varies spatially. The north and south have the most abundant rainfall, followed by the central coastal area, and the central piedmont has the least amount of rainfall; and (2) the average precipitation also varies temporally. Over 68.7% of the rainfall occurs in summer, while only about 2.5% occurs in winter. In addition, annual precipitation in the Haihe River Plain had an insignificant decreasing trend in the recent 56 years, which was caused by the obvious decreasing trend of precipitation in summer. Among the 28 Level-4 sub-segments, 12 of them showed a significant decreasing trend of precipitation, and they are mainly located in the Heilonggangyundong Plain and the piedmont plain in the northwest. Moreover, a few Level-4 sub-segments had an insignificant increasing trend of precipitation. In the recent 56 years, there was no significantly periodic change on the annual precipitation; however, there were a 4-year interval, a 7-year interval, and an 11-year interval occurring during the periods of 1956 to 1990, 1993 to 2011, and 1956 to 1980, respectively.
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