Two-dimensional hydrological-hydrodynamic one-way coupling method based on square adaptive grid

The invention provides a two-dimensional hydrological-hydrodynamic one-way coupling method based on a square adaptive grid. The method comprises the steps that step 1, an adaptive computing grid (M2)of a two-dimensional hydrodynamic model is constructed based on a square computing grid (M1) of a distributed hydrological model; step 2, hour-scale net rainfall raster data calculated by the distributed hydrological model is obtained; step 3, on spatial scale, M1 raster data is transformed into M2 raster data according to an algebraic relationship; step 4, on time scale, hour-scale M2 raster datais transformed into second-scale M2 raster data consistent with the time step of the two-dimensional hydrodynamic model by adopting interpolation; step 5, the raster data after down-scaling can serveas a driving condition, and source items of a mass conservation equation in the two-dimensional hydrodynamic model can be input for hydrodynamic calculation. The two-dimensional hydrological-hydrodynamic one-way coupling metho