针对环状灌区渠系与平原区高差变化不明显这两种因素交织作用下的灌区高精度河网提取难题,基于地表径流漫流模型基本原理,利用ArcSWAT平台的河网提取和流域划分模块,在原始DEM和实测河网的基础上,提出了河网提取的渠系分级挖深与预制流域耦合方法,并在具有耗散特性的玛纳斯河流域进行了应用。结果表明,该方法提高了灌区河网模拟和子流域划分精度,为分布式水文模型在灌区的推广应用提供了可供参考的前处理技术手段。 According to the basic principle of surface runoff and runoff model, using the river network extraction and watershed division module of ArcSWAT platform to solve the problem of high precision river network extraction under the intertwined effect of two factors, Based on the original DEM and the measured river networks, a new coupling method of grading depth of canal system and prefabricated river basin is proposed and applied in the Manas River basin with dissipation characteristics. The results show that this method improves the accuracy of river network simulation and sub-basin classification in irrigation area and provides a reference for the application of distributed hydrological model in irrigation area.