A Contrastive Study of Simulation Results between GWSC-VMR and Hybrid Runoff Model in Dianzi Basin

For the purpose of hydrological process simulation in cold and arid regions, the authors brought out the Vertically-mixed runoff model with Grid-based Water Storage Capacity(GWSC-VMR) on the base of the spatial distributed model of water storage capacity. In GWSC-VMR, factors such as topography, vegetation, soil and meteorology were taken into account. GWSC-VMR included canopy interception module, snow accumulation and melt module, evapotranspiration module and runoff yield and concentration module. To verify the simulation result of GWSC-VMR, both GWSC-VMR and hybrid runoff model were applied in Dianzi basin to simulate the daily runoff process in the period of 1973 to 1979. After simulations, the authors found that the annual average NASH-Sutcliffe coefficient of GWSC-VMR reached 0.80; as well as the annual average NASH-Sutcliffe coefficient of hybrid runoff model was only 0.67. Simulation results indicated that the annual NASH-Sutcliffe coefficient of GWSC-VMR is high and this hydrological model is adequate for arid and semiarid area daily runoff simulation. Furthermore, as a distributed hydrological model, GWSC-VMR could be applied in regional water resource management.