Small- and medium-sized rivers are facing a serious degradation of ecological function in water resource-scarce regions of Northern China. Reservoir ecological operation can restore the damaged river ecological environment. Research on reservoir ecological operation and watershed management of urban rivers is limited in cold regions of middle and high latitudes. In this paper, the urban section of the Yitong River was selected as the research object in Changchun, Northern China. The total ecological water demand and reservoir operation water (79.35 × 106 m3 and 15.52 × 106 m3, respectively) were calculated by the ecological water demand method, and a reservoir operation scheme was established to restore the ecological function of the urban section of the river. To examine the scientific basis and rationality of the operation scheme, the water quality of the river and physical habitat after carrying out the scheme were simulated by the MIKE 11 one-dimensional hydrodynamic-water quality model and the Physical Habitat Simulation Model (PHABSIM). The results indicate that the implementation of the operation scheme can improve the ecological environment of the urban section of the Yitong River. A reform scheme was proposed for the management of the Yitong River Basin based on the problems in the process of carrying out the operation schemes, including clarifying department responsibility, improving laws and regulations, strengthening service management, and enhancing public participation.

中文翻译：

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北方城市河流生态运行与流域管理研究

我国北方水资源匮乏地区中小河流生态功能严重退化。水库生态运行可以恢复被破坏的河流生态环境。中高纬度寒冷地区对城市河流水库生态运行和流域管理的研究有限。本文以华北长春市伊通河城区段为研究对象。采用生态需水法计算生态需水总量和水库运行用水总量（分别为79.35×106 m3和15.52×106 m3），建立水库运行方案，恢复河流城区段生态功能. 审查操作方案的科学依据和合理性，采用MIKE 11一维水动力-水质模型和物理栖息地模拟模型（PHASIM）对实施该方案后河流和自然栖息地的水质进行了模拟。结果表明，运营方案的实施可以改善伊通河城区段的生态环境。针对伊通河流域管理在实施方案中存在的问题，提出了明确部门职责、完善法律法规、加强服务管理、增强公众参与等方面的改革方案。