Abstract: At present, studies on runoff simulation in small-scale watersheds with insufficient meteorological and hydrological data are inadequate. The monthly runoff of the Aojiang River basin from 2008 to 2016 is simulated using the SWAT model driven by the China Meterological Assimilation Driving Datasets (CMADS). The model is calibrated and validated with the calculated data by the hydrological analogy method in line with the observation data of two adjacent traditional meteorological stations. The simulation results are in good agreement with the observed values. The values of correlation coefficient and Nash-Suttcliffe efficiency coefficient are 0.84 and 0.76 in calibration period (2010-2013), and 0.85 and 0.74 in validation period (2014-2016), respectively, meeting the evaluation requirements for the model. The SWAT model driven by CMADS is suitable for runoff simulation in Aojiang River basin, and the hydrological analogy method is suitable for runoff calculation in areas with insufficient hydrological data.

Key words: runoff, CMADS, SWAT model, hydrologic analogy method, Aojiang River basin