黑河干流高崖断面径流变化及其模拟

Runoff Change and Its Simulation in Main Stream of Heihe River at Gaoya Section

作为张掖市甘州区与临泽县之间的黑河干流的控制断面,高崖断面径流量变化反映了甘州区地表水、地下水、灌溉用水之间的转化特征。在定性分析黑河干流高崖断面径流组成的基础上,提出了河道渗漏和地下水溢出的简化模型,利用月引水比例刻画灌溉引水量的年内变化,以莺落峡径流量和典型观测孔水位为输入,对高崖断面的月径流量进行了模拟。模型重建的1989—2006年高崖断面月径流量NSE(Nash-Sutcliffe coefficient of efficiency)系数达到0.88。所提出的方法充分考虑了河道水量适时变化条件下的河道渗漏行为以及人类活动的影响,是对高崖断面径流变化研究的一次积极探索。

Gaoya section is a control section of main stream of the Heihe River between Ganzhou district and Linze country,Gansu,China,and runoff variation at the section can well reflect the transform between surface water,groundwater and irrigation water in Ganzhou district.Based on qualitative analysis of the components of the runoff,a simplified model is put forward to explain stream channel leakage and groundwater spillage.Monthly water diversion ratio is introduced to describe the intra-annual changes of irrigation water from the Heihe River,and monthly runoff series are simulated with runoffs at the Yingluo Gorge section and groundwater levels measured in typical observation wells as inputting parameters.Nash-Sutcliffe coefficient of efficiency of the simulated monthly runoff series during 1989-2006 can be up to 0.88.The method emphasizes the leakage behavior of stream channel under the condition of stream flow timely changing and human activities,and it is a positive try to understand the variations of the Heihe river runoff at the Gaoya section.