作　　者： (王利花）; (路鹏）;

机构地区： 成都信息工程大学资源环境学院,四川成都610225

出　　处： 《水土保持通报》 2017年第4期266-270,共5页

摘　　要： [目的]分析大通水文站水文泥沙的趋势性、突变性和周期性,揭示其长时间序列的特征,为河口三角洲的发育及演变研究提供理论依据。[方法]采用Mann-Kendall趋势分析法、有序聚类分析法和小波分析法,对大通站近60a来径流量和输沙量时间序列进行特征分析。[结果]大通站年径流量无明显的趋势性变化特征,年际波动较大,年内分配极不均匀;年径流量不存在显著的突变性特征,但具有6和44a的周期性变化特征。年输沙量具有显著的线性下降趋势,同时年内分配不均;年输沙量存在显著的三级突变性变化,2002年为一级突变,1984年为二级突变,1968和1991年为两个三级突变;年输沙量还存在明显的12和30a周期性变化特征。[结论]大通站年径流量无明显的趋势性和突变性,存在一定的周期性;年输沙量存在显著的下降趋势,具有明显的突变性和周期性。 [Objective] The trend, fluctuation and change cycle of runoff and sediment discharge at Datong hydrometric station were analyzed in order to reveal its characteristics of long time series, which were expected to further provide theoretical basis for the development and evolution of estuarine delta. [Methods] Using Mann-Kendall test, Pettitt change point, Mexican Hat wavelet transform methods, the characteristics of runoff and sediment discharge were analyzed at Datong station in the past 60 years. [Results] The results showed that there was no significant change trend in the mean annual runoff at Datong station, while the inter annual fluctuation was large and annual distribution was uneven. Repeated periodic oscillations were presented in the runoff series, the major cycle periods of the time series were about 6 and 44 years, respectively. Furthermore, sediment discharge had been declined obviously over the past 60 years and its annual distribution was uneven. There existed significant hopping site in the mean annual sediment discharge. In 2002, the hopping site of step down was first grade, the second grade was in 1984 and the third grades were in 1968 and in 1991. Repeated periodic oscillations also existed in the sediment discharge series, the major cycle periods of the time series were about 12 and 30 years, respectively. [Conclusion] There were no obvious trend and abrupt change of annual runoff at Datong station, but periodicity existed to some extent. There was a significant downward trend of annual sediment transport with obvious periodicity and abrupt change.

关 键 词： 大通站 径流量 输沙量 趋势性 突变性 周期性