洮河干流径流变化特征分析

依据洮河干流上、中、下游的四个主要控制水文站实测月、年径流量资料,运用矩法和Mann-Kendall秩次检验法等方法,研究洮河干流径流的周期性、突变性、相关性等变化规律,揭示洮河干流径流年内年际的演化规律和变化趋势。结果表明:洮河干流上、中、下游径流年内分配多年变化趋势一致,由集中向均匀转变,但变化趋势不显著,自上游向下游不均匀性增强;径流量年际变化大,但总体有逐渐减小的趋势;洮河上游、下游径流年际变化平稳,中游年际变化剧烈。

Analysis of Characteristics of Runoff Variation in Taohe River Main Current

According to the measured monthly and annual runoff data of the four main hydrological control stations on the upper reaches,middle reaches and downstream of Taohe River,using the methods of moment and Mann-Kendall rank correlation and so on,the paper studied on the changes in the law of the Taohe River main current runoff,such as periodic properties,mutation and correlation,revealed intra-annual and inter-annual variation and trend of the Taohe River.The results show that it changes the same of the intra-annual distribution,and changing from centralization to uniformity,but the trend is not significant,the in homogeneity increases from the upper reaches to the downstream;It’s large of the runoff’s inter-annual variations,however,it has a trend of gradually decreasing;It is stable to the inter-annual variation of the Taohe River in upper reaches and downstream runoff,but changes violently in middle reaches.