Abstract: In order to achieve the goal of restoring water to the river as long as possible and to restore the basic ecological functions, a SWAT (soil and water assessment tool) hydrological model for the Fuyang River basin was established based on the current status of water conservation measures and water transfer projects. The different ecological water replenishment scenarios were designed, the variation of runoff volume and the restoration of the annual number of days with water were analyzed for different scenarios. Ecological restoration effects were analyzed based on the ecological base flow standard. The results show that the river ecological restoration effect is better in the water conservation scenario and the water transfer scenario in the Handan section of Fuyang River basin, and 184 days of water restoration from May to October can be achieved through the upstream water conservation measures and the scenario of 1.00×108 m3/a of supplemental annual water transfer, and the restored runoff volume of 3 486.7×104 m3/a, the water replenishment can reach the ecological baseflow standard and guarantee the basic ecological function of the river. The Xingtai section in the lower reaches of Fuyang River has less restored runoff under water-saving and water transfer scenarios, so the number of days with water in the river does not meet the standard, and it needs to supplement the external water transfer volume of 1.50×108 m3/a under the upstream water conservation condition to achieve the restoration of the annual number of days with water is 304 days and the restored runoff volume of 1 906.5×104 m3/a, and Xingtai section under the scenario of achieving the target of restoring water. The ecological replenishment scheme of increasing water transfer for single point replenishment in different periods needs to be considered as it cannot reach the ecological base flow standard of the river.

Key words: SWAT model, ecological water replenishment, water restoration, scenario analysis, Fuyang River basin