泾惠渠灌区降水径流奇异谱分析

泾惠渠灌区是陕西省主要产粮区之一,灌区降水径流等水资源对于灌区的农业生产关系重大,分析灌区降水径流特性,明确灌区降水径流的主要影响因素,是灌区合理规划利用各种水资源的基础。降水径流等水文要素成因复杂,受气候因素影响具有周期性震荡特性,采用能够降噪和降维的奇异谱分析(SSA)方法对泾惠渠灌区降水径流时间序列震荡特征进行分析。分析显示,灌区降水径流时间序列均具有准3~4 a,9~12 a,18~22 a的周期性,与东部季风、太阳黑子等现象的周期性活动关系密切。由此表明,泾惠渠降水径流主要受东部季风的影响,且受太阳黑子等大尺度周期性因素的综合影响。

Singular Spectrum Analysis on Precipitation and Runoff in the Irrigation Area of Jinghui Canal

The irrigation area of Jinghui canal is a main grain-producing area of Shaanxi province.Water resources such as precipitation and runoff are of vital importance to the agricultural production in the area.Analysing the characteristics of precipitation and runoff and identifying their influence factors are basis of managing water resource in irrigation areas.Singular spectrum analysis (SSA)method is employed to analyze the oscillation of precipitation and runoff time series in the irrigation area of Jinghui canal.Results reveal that the precipitation and runoff series in the irrigation area are closely related with monsoon in the east and sunspot activities,with cycle of 3-4 years,9-12 years and 18-22 years.The precipitation in Jinghui canal is mainly affected by monsoon in the east,and is also in-fluenced by large-scale cyclic factors like sunspots.