A spectral analysis approach for the a priori generation of computational grids in the 2-D hydrodynamic-based runoff simulations at a basin scale

•Rigorous approach for the a priori design of computational grids.•Identification of characteristic scales based on 2-D Fourier analysis.•“A-priori” design of the computational grid starting from the characteristic scales.•Significant decrease of run times and negligible errors on outflow hydrograph...

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