Characteristics of precipitation and runoffs during 1961-2013 in Weihe River basin
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Abstract:
Using the moving average, cumulative departure, and linear tendency estimate methods, this paper investigated the precipitation characteristics of Weihe River basin during 1961-2013. The abrupt runoff changes were analyzed using the smoothing t test, orderly clustering, and double mass curve methods. The results showed that the precipitation in the Weihe River basin was generally decreasing, with 86 rainy days in an average year. The precipitation varied in different seasons, and was mainly concentrated in summer and autumn; it obviously decreased in spring and autumn. The number of heavy rainy days was significantly correlated with the annual average precipitation; the larger the annual average precipitation, the more frequent the heavy rainy days in an average year. Rainstorm intensity was increasing in the west and north of Weihe River basin, but was slightly decreasing in the east and south. The runoff in Huaxian had an abrupt change in the early 1970s and early 1990s. The precipitation variation was basically consistent with the runoff variation trend.
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