Analysis on Variation Characteristics of Areal Rainfall in Yalong River Basin in 1981-2017
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摘要: 利用1981～2017年雅砻江流域18个气象站的逐日降水资料，采用算术平均、滑动平均、线性回归等方法，分析了流域面雨量、雨季的时空分布特征。结果表明：雅砻江流域面雨量随月份起伏明显，年内变化呈单峰型。流域春季面雨量呈增加趋势，夏季面雨量中上游呈稳定趋势，下游呈减少趋势，秋季中游和下游呈减少趋势，冬季变化不明显。流域年平均面雨量由北向南逐渐增多，上游和中游呈上升趋势，下游呈下降趋势。雅砻江流域雨季开始期呈提前趋势，雨季结束期上游和下游有推迟趋势，中游变化趋势不明显。流域强降水主要出现在6～9月，面雨量最大值出现在7月，最小值在1月。流域上游的强降水与中游、下游的基本没有关联度；下游强降水和中游关联度为23.3%。Abstract: By using the daily precipitation data of 18 weather stations in Yalong river basin during 1981 to 2017, areal rainfall and the spatial and temporal distribution characteristics of rainy season in Yalong river basin were analyzed through arithmetic mean method, moving average method and linear regression method. The results showed the areal rainfall in Yalong river basin fluctuated obviously with the month, and the annual variation was unimodal. The spring areal rainfall in the basin showed increasing trend. The summer areal rainfall in the upper reaches showed a stable trend and the lower reaches showed a decreasing trend. The autumn areal rainfall in the middle reaches and the lower reaches showed a decreasing trend. The winter areal rainfall showed no obvious change. The average annual areal rainfall in the basin increased gradually from north to south, and showed rising trend in upper and middle reaches and downtrend in lower reaches. The start date of rainy season in the basin was in advance. The end date of rainy season in upper and lower reaches was delay, and had no obvious change in middle reaches. The heavy rainfall mainly appeared during June to September. The maximum value of areal rainfall in the basin was in July and minimum value was in January. The heavy rainfall in upper reaches had no correlation with middle reaches and lower reaches, and the correlation between middle reaches and lower reaches was 23.3%.
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Keywords:
- Yalong river basin /
- areal rainfall /
- heavy rainfall
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