In order to more reasonably determine the ecological flow guarantee factors and targets of tidal rivers

fully reflect the water ecological guarantee needs of tidal rivers

and use comprehensive analysis methods to classify and discuss tidal rivers and analyze their water ecological characteristics

this article proposes the main factors that need to be considered for ecological flow guarantee of tidal rivers are saltwater intrusion and the relationship between main and tributary rivers. Taking the Huangpu River as a case study

the article points that tributaries controlled by tides and the main stream can more comprehensively play the role of ecological flow guarantee by using the net discharge flow and chloride ion concentration of the control section as guarantee factors. At the same time

consideration should be given to industrial and agricultural production

domestic water use

and river mouth salinityto reasonable determineguarantee targets and warning thresholds.