根据国家和地方对黄河水量的分配比例，未来内蒙河套灌区引黄水量为40亿m3/a，而目前河套灌区多年平均引黄水量为52亿m3/a。随着引黄水量的逐年减少和灌区经济的快速发展，本地区水资源供需矛盾更加突出，合理利用有限水资源成为灌区的首要任务。通过灌区现状水资源供需平衡分析，并根据河套灌区中长期规划和水资源利用特点，设计了2种引黄水和地下水联合利用方案，同时对规划年水资源联合利用情况进行了优化分析，并对不同方案下的地下水动态变化进行了模拟。结果表明，通过优化产业结构、增加井渠结合灌溉面积，有效利用地下水资源包括微咸水，可以在40亿m3/a引黄水量下维持灌区可持续发展。

According to the national and local allocation proportions of water resources in the Yellow River, the irrigation water amount drawn from the Yellow River will be limited to less than 4.0 × 109 m3 per year in the future for the Hetao Irrigation District while the current irrigation water amount is about 5.2 × 109 m3 per year. With the decreasing of the irrigation water amount and rapid economic development, the conflict between the supply and demand of water resources can be more serious, therefore the reasonable utilization of the limited water resources is the primary task faced by the local authority in the Hetao Irrigation District. Based on the analysis of current supply and demand balance of water resources and the long-term plans and water resources utilization in the irrigation district, two schemes of conjunctive use of irrigation water from the Yellow River and groundwater are developed. Moreover, the optimization analysis is conducted on the conjunctive use of water resources in the planning year and the dynamic variations of groundwater under different schemes are simulated. The results show that the irrigation water of 4.0 × 109 m3 per year can maintain the sustainable development of the irrigation district under the conditions of optimizing the industrial structure, enlarging the combined well-canal irrigation areas, and using the groundwater resources including brackish water effectively.

国家自然科学基金资助项目（41001318）；中央高校基本科研业务费专项资金资助项目