Variation characteristics of precipitation in the Yishu River Basin from 1954 to 2010
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Abstract:
According to the precipitation data of seven representative precipitation stations in the Yishu River Basin from 1954 to 2010, the variation characteristics of precipitation were analyzed using the correlation coefficient, frequency analysis method, ac 2 cumulative anomaly method, M orlet wavelet method, M ann2Kendall method, and R/ S method. T he results showed that ( 1) there is a significantly positive correlation between the precipitation data series of each station, and the average annual precipitation in2 creases gradually from north to south, while the annual variation magnitude of precipitation decreases from north to south; (2) the occurrence frequencies of partial wet year and normal year are the highest; (3) the variations of annual precipitation have un2 dergone three wet phases, one normal phase, and four dry phases; ( 4) the first characteristic time scales of annual precipitation, flood season precipitation, and non2flood season precipitation are 12 a, 12 a, and 5 a, respectively, the second characteristic time scales are 16 a, 17 a, and 5 a, respectively, and the third characteristic time scales are 4~ 5 a, 4~ 5 a, and 3 or 10 a, respectively; and (5) annual precipitation, flood season precipitation, and non2flood season precipitation have a decreasing trend, and precipi 2 tation of most stations will have a strong decreasing trend in the future.
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