Application Of Mixed Factorial Design In Kaidu River Basin Runoff Simulation

Watershed hydrological model is an important branch of hydrology research. SWAT model was developed by Dr. Jeff Arnold of the United States Department of Agriculture in the 1990s. It belongs to the distributed watershed hydrological model and is used to simulate runoff, water quality, sediment and other long period of hydrological phenomena in the large basin scale. SWAT model has physical mechanism, and is dynamic simulation model by the step length of day. ArcSWAT is on the ArcGIS platform expansion mode. ArcSWAT use different terrain, soil type, land use or cover type to divide watershed into a number of hydrological response units (HRU), which have similar hydrological characteristics. And it can simulate the complex basin runoff, sediment, nitrogen, phosphorus, pesticides 1 outflows and evapotranspiration. In this paper, SWAT model was used to simulate Kaidu River basin runoff, and then sensitivity analysis, calibration and validation were carried out. SWAT model has hundreds of parameters, but the sensitivity of different parameters is different. Manual calibration process can sum up parameters’ influence on the flow duration curve. Mixed factorial design of six selected parameters can quantitatively analyze the impact of parameters on runoff simulation, and vividly show the influence of parameters. In the meantime, interactively influence of parameters can be obtained.