INFLUENCE OF MODEL PARAMETERS' SPATIAL DISTRIBUTIONS ON RAINFALL-RUNOFF SIMULATION RESULTS

Abstract

Influence of spatial distributions of model parameters on rainfall-runoff simulation results is investigated. Values of hydraulic conductivity and thickness of A-layer are generated according to log normal distribution; each value is assigned randomly to each slope element; runoff simulation is conducted by using a distributed rainfall-runoff model. The above procedure is repeated and simulated hydrographs are compared. As a preliminary result, we obtained that spatially lumped distribution information (mean and variance) of hydraulic conductivity and thickness of A-layer is the most important information to form a hydrograph, and spatially explicit information of the parameters is not always needed under spatially uniform rainfall condition.