泾惠渠灌区渠首地表水资源可利用量长期变化及其潜力研究

Study of long-term variation and potential of available surface water resources of Jinghui Canal Head

以泾惠渠灌区渠首——泾河张家山站长系列水文数据为研究对象,利用滑动平均、Tenant、回归分析及概率统计等方法分析了泾河来水形势、河道内生态环境需水量以及汛期不可利用水量,深入研究了泾惠渠灌区渠首水资源可利用量、灌区可引水量及引水潜力等问题。研究结果表明:泾河流域张家山站实测年径流量呈现出明显递减趋势,多年平均实测径流量从20世纪60年代的17.15亿m3下降到近十年来的9.95亿m3,实测径流距平最小达到-29.6%;河道内全年水资源可利用率基本维持在50%～60%左右;随着河道水资源利用的沙限的提高,灌区渠首可引水量及可引水量潜力均相应有所增加。按照目前泾河来水水源形势,灌区仍有1.66～2.10亿m3左右引水潜力可以挖掘。

Based on long series of hydrological data of Jinghui Canal head on Jinghe River,the runoff,the water demand in dry season,and the unusable runoff in flood season were analyzed using moving average,regression,statistic and Tenant methods. The average annual usable runoffs and potentially usable runoffs of the Jinghe River were further discussed. The results showed that the annual runoff of Jinghe River decreased apparently from 1.72 billion m3in the 60’s of last century to less than 1.00 billion m3 now and the observed minimum runoff departure was almost-29.6%. The average annual usable runoff was about 50% to 60% of the total runoff. Both of the average annual usable runoff and the potential usable runoff were increased with the improvement of sediment limitation for the irrigation and its canal system. According to the runoff situation and its trend of the Jinghe River,there are still 166 to 210 million m3 of runoff,which are potential available for the Jinghui Canal Irrigation Area.