4 Results
In this section, we first evaluated the simulation results of the model system and then conducted the sensitivity analysis for the two most important model outputs: discharge at the basin outlet and surface runoff at the grid points (0.25° × 0.25°) of the study basin. Because the Xinanjiang model is a conceptional hydrological system, it provides only one output for the entire domain; therefore, the distribution of surface runoff was estimated using only the VIC model.