景电一期灌区沟道退水滞后性

Lag of channel return flow in Jingdian Irrigation District Phase Ⅰ

为揭示干旱区引黄灌区沟道退水滞后性规律,根据景电灌区沟道退水监测资料,采用交叉相关系数法和数据平移法确定灌区退水滞后时间,分析退水时空变化规律及其影响因素.研究表明,各退水口的年退水量差异不大,多年平均退水量约为4 622.3万m3,占灌溉引水量的31%.不同退水口之间的退水量差异较大,其中响水村占总退水的67.0%,五佛乡占总退水的30.6%,二期总一泵占总退水的2.0%.景电灌区不同退水口月退水量的主要影响因素为退水口控制面积和退水滞后时间,影响退水滞后时间的因素包括引水、降水、退水路径长度和人工开挖排水渠等.不同退水口的退水滞后时间在1~5个月,响水村退水滞后性较五佛乡和二期总一泵强,由灌溉和引水引起的退水滞后性有所差异.研究结果所揭示的景电灌区退水滞后效应及其影响因素,可为灌区水资源合理配置与精准调控提供理论支撑.

In order to reveal the lag law of channel return flow of the Yellow River Diversion Irrigation Area in the arid area, according to the monitoring data of the channel return flow of Jingdian Irrigation District, the cross-correlation coefficient method and data translation method were used to determine the lag time of return flow in the irrigation area, and the temporal and spatial variation law of return and its influencing factors were analyzed. The research shows that there is little difference in the annual return flow of each water outlet. The average annual return flow is about 46.223 million m~3, accounting for 31% of the irrigation water diversion. There is a large difference in the amount of return flow from different water outlets, among which Xiangshui Village accounts for 67.0% of the total return flow, Wufo Township accounts for 30.6% of the total return flow, and the Total Pump Ⅰ in Phase Ⅱ accounts for 2.0% of the total return flow. The main influencing factors of the monthly return flow of different water outlets in Jingdian Irrigation District are the control area of the outlet and the lag time of return flow. The factors affecting the lag time include water diversion, precipitation, the length of the return flow path and manual excavation of drainage channels. The lag time of different outlets is between 1-5 months. The lag of Xiangshui Village is stronger than that of Wufo Township and the Total Pump I in Phase Ⅱ. The lag of return flow caused by irrigation and water diversion is different. The lag effect of return flow and its influencing factors revealed in this study can provide theoretical support for rational allocation and precise regulation of water resources in Jingdian Irrigation District.