为减少以调水和蓄水工程为主体的区域水网建设对生态环境的影响，以大通河为研究对象，筛选 9 种水文 学方法计算青石嘴、天堂、享堂 3 个关键控制断面 12 种不同的生态流量过程，基于过去 60 年径流时空分布以及 水-能源-生态（water-energy-ecosystem，WEE）纽带模型，开展生态调度计算分析。结果显示：大通河干流河道内生 态流量过程沿程增加，青石嘴、天堂、享堂 3 个断面年生态需水总量分别为 1.62 亿~14.54 亿m3、2.46 亿~22.04 亿m3和 2.88 亿~25.46 亿m3，且均以 Q90_Q50方法为最大，Tennant（10%）方法为最小；在不同生态需水约束下，引大济 湟工程调水规模介于 2.25 亿~8.81 亿m3，占流域多年平均径流量的 7.8%~30.5%；生态需水保障率整体表现为非汛 期高于汛期，上游高于下游。兼顾生态环境保护与经济社会发展双重目标，为合理确定调水规模提供技术支撑。

The construction of a regional water network is a crucial measure to address complex water problems such as the uneven spatial and temporal distribution of water resources, while to achieve the goal of ecological protection and high-quality development. The water network, mainly consisting of water transfer and storage projects, has changed the pattern of water resources and the eco-hydrological processes of rivers, and has adverse impacts on the ecological environment. The Datong River basin is abundant in water resources and has great potential for hydropower. The three major water transfer projects (from Datong River to Qinwangchuan basin, from Datong River to Jinchang City, and from Datong River to Huangshui River basin) in this region have made great contributions to the economic and social development of the Xining-Lanzhou City cluster. Given that the Datong River basin includes environmentally sensitive areas such as the upper reaches of the Yellow River Reserve and the Qilian Mountain National Park, ensuring ecological safety is important. Unfortunately, some early projects failed to adequately consider environmental protection requirements at the planning stage, resulting in significant changes in river hydrology, including reduced river flows, deteriorating water quality, and declining biodiversity.On the basis of comprehensive understanding of the eco-hydrological conditions, the characteristics of water transfer and hydropower projects, and the current situation of water resources utilization in the Datong River basin, three key control sections (Qingshizui, Tiantang, and Xiangtang) were determined. Nine widely used hydrologically-based methods were employed to calculate 12 ecological flow processes at the three sections, which were considered in the water resource allocation of the Datong River basin. Furthermore, the Water-Energy-Ecosystem (WEE) Nexus model, which was developed based on multi-objective and nonlinear programming, was used to optimize and compare the operations of different water diversion and storage projects as well as the corresponding ecological flow guarantee rate under 12 different ecological flow processes, with the past 60-year hydrological series as the model input. The following conclusions can be drawn. (1)The ecological flows were increased from upstream to downstream along the Datong River (Qingshizui

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