1991 Volume 35 Pages 675-678
A basic study on scale effects of hydrologic cycle is presented. The interflow and overland flow model which takes into account the variable source area with high permeable surface layer was composed first. Next, the direct runoff simulations were executed for rainfall events in many different size of actual catchments considering various catchment parameters such as length, inclination and hydraulic conductivity of surface soil of slopes. Finally, the relation between catchment scale and maximum direct runoff discharge was discussed. Based on the results of the simulation, the composition of the conventional (maximum) specific discharge curve was also explained.