부산대학교 도서관

Although various rainfall-runoff models have been developed so far, practical ones often simplify the actual phenomena and provide insufficient accuracy without parameter calibration. Physical models based on Richards’ equation can directly determine their parameters from observed soil properties but are not practical because of their huge computational cost. In this study, we developed a vertical quasi-two-dimensional surface-subsurface flow model (quasi-2D model) based on Richards’ equation, in which the hydraulic gradient in the downward direction was approximated by the slope gradient. Rainfall-runoff simulations were conducted on a single slope using the quasi-2D model and compared with the results computed by a detailed model solving the two-dimensional Richards’ equation (2D model). The quasi-2D model reproduced the results of the 2D model well (NSE > 0.99). The computation time of the quasi-2D model was reduced to less than 1/10 of that of the 2D model, confirming the usefulness of the quasi-2D model.