Analysis of Runoff Variation and Its Impact Factors in the Wuyun River Basin
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Abstract:
Based on the data of monthly flow, monthly precipitation, and monthly evaporation at the Dongfeng Station in the Wuyun River Basin, we analyzed the main water supply source to the runoff of Wuyun River and the effects of precipitation and evaporation on the runoff of Wuyun River through the calculations of variation coefficient, , peak-pattern degree，high and low runoff ratio, and the climate tendency rate of the hydro-meteorological elements. The results showed that（1）the variation coefficient of annual runoff is 0.32 in the Wuyun River, and the runoff is mainly supplied by snowmelt and precipitation in summer. The annual runoff decreases gradually in four seasons, flood season, and non-flood season, and the decreasing of runoff is more significant during the flood season; and (2)the precipitation and evaporation in the Wuyun River decrease annually and the climate tendency rate of evaporation is -175 mm/10 a. The analysis indicated that the gradual reduction of precipitation may be one of the reasons to cause the decreasing of runoff in the Wuyun River Basin.
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