Ecological scheduling method for habitat remodeling of fish spawning site in variable backwater area

The invention discloses an ecological scheduling method for habitat remodeling of a fish spawning site in a variable backwater area, and the method comprises the steps: building a depth two-dimensional plane numerical model of the variable backwater area of a reservoir, and recording the two-dimensional plane numerical model as a two-dimensional hydrodynamic model; the method comprises the following steps: simulating the effective habitat area (WUA) of fishes under the average flow of many years when a natural river channel in a variable backwater area is changed, further determining a target WUA value, then simulating the WUA under different flow and water level working conditions after database building, further determining the working condition capable of enabling a spawning site in the variable backwater area to meet the target WUA value, and further determining the working condition of the spawning site in the variable backwater area to meet the target WUA value. And selecting a water level interval meet