西北某大型引黄灌区农业灌溉节水潜力计算研究OA

To scientifically calculate the agricultural irrigation water-saving potential in a large-scale Yellow River diversion irrigation area in Northwest China,the study employs both the component method and the holistic method to calculate and compare the potential water savings from engineering measures such as canal lining,border-strip improvement,and high-efficiency water-saving technologies.The water balance method is applied to simulate and predict groundwater level dynamics under different water-saving scenarios.Combined with the suitable groundwater depth thresholds required for the growth of major regional vegetation,the water-saving potential is constrained ecologically to de-termine the appropriate water-saving potential of the irrigated area.The results show that:The current comprehensive irrigation water use effi-ciency in the irrigated area is 0.439.The potential water savings calculated by the component method amount to 886 million m3,of which ca-nal lining,border-strip improvement,and high-efficiency water-saving technologies contribute 610 million m3,230 million m3,and 46 mil-lion m3,respectively.The potential water savings calculated by the holistic method amount to 808 million m3,with the corresponding compre-hensive irrigation water use efficiency increasing to 0.532.The ecological impact analysis indicates that unconstrained water saving would lead to a decline in groundwater levels,threatening vegetation survival.After verification under ecological constraints,the appropriate water-saving potential of the irrigated area,under the premise of maintaining ecosystem stability,is 850 million m3.The study concludes that although the irrigated area holds significant water-saving potential,the scale of water saving must be kept within the carrying capacity of the ecosystem.