An improved spatial interpolation method for distributed hydrological simulation

Precipitation data is one of the important input data in the hydrological model. Spatial interpolation of rainfall is an effective method to obtain surface rainfall data. Therefore, it is very important to improve the existing rainfall interpolation met ho ds to obtain more accurate continuous time series and surface precipitation data. MIKE SHE hydrological model was used to simulate the daily runoff using improved interpolated precipitation data to analyze the accuracy of the model in the Yuan Jiang Basin . Results exhibited that the precipitation data obtained by the improved method ( IDW-Thiessen interpolation method) was better than Thiessen polygon in the process of runoff simulation. Therefore, daily runoff process was carried out by using the precipitation data obtained by IDW-Thiessen interpolation method in the Bu Yuan Jiang Basin. The Nash coefficients were higher than 0.7 during the calibratio n and validation periods compared to the Nash coefficients of the runoff simulation results

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