Calculation of the instream ecological flow of Shifengxi River in Zhejiang Province, China using hydrology and section morphology analysis method

The instream ecological flow is one of the most important obligatory targets of water resources development and utilization, as it is the premise and basis for sustainable water resources development and water ecological environment protection. This paper proposed an instream ecological flow calculation method based on hydrology and section morphology analysis. The method had a certain concept of guarantee rate, and also considered the hydrological habitat requirements of the river section. The application of the method in Shifengxi river basin located in Taizhou city shows that the instream ecological flow of the Shaduan section is 14.0 m3/s during the spawning period and 3.1 m3/s during the normal period.