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Lag of channel return flow in Jingdian Irrigation District Phase I |
GAO Qiuyan1, ZHANG Jinghui1, FEI Liangjun2*, JIE Feilong2, LI Shan2, LI Jingsi2 |
1. Gansu Jingtaichuan Electric Power Irrigation Water Resources Utilization Center, Jingtai Gansu 730400, China; 2. State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi′an University of Technology, Xi′an, Shaanxi 710048, China |
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Abstract 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 m3, 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% 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% 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.
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Received: 27 October 2021
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