The preliminary application of a mixed model on watershed simulation

A mixed model which integrated a 1:100 physical model with the SWAT model was constructed based on the similarity theory and measured data in KangJiaGeLao watershed, aiming at the problem that the hydrology process was hard to be simulated on the Loess Plateau where serious soil erosion happens. The small watershed was simulated using the mixed model before and after the terraced fields were constructed respectively. Preliminary results revealed that the terraced fields, which accounted for about 47% of the total area, could reduce the runoff by 68%, sediments by 50% under the same precipitation condition. At the same time, the mixed model was a new choice for the watershed hydrological process simulation.