Study on applicability of different evaporation data in rainfall runoff simulation
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Abstract:
In order to explore the influence of different evaporation data on the accuracy and quality of rainfall runoff simulations, Pan evaporation, potential evapotranspiration estimated by discretized Thornthwaite empirical formula and the fixed value as e vaporation data were selected as inputs to simulate the runoff process using Xin'anjiang model from 1981 to 2004 in the Tunxi watershed. The effect of three kinds of data on runoff simulation results were compared and analyzed. Funhermore, the sensitivity of different seasons on the accuracy of evaporation data was analyzed based on the error regularity of each season in a year. The results showed that the average deterministic coefficient of pan evaporation, and evapotranspiration estimated hy formula and fixed values were 0.90,0.89 and 0.86，respectively,while the applicability of evapotranspiration estimated by formula was better. On the seasonal scale, spring and autumn seasonal changes were more sensitive to seasonal evaporatior data and tequiredhigher accuracy of potential evapotranspiration in the basin. By optimizing the simulation results using fixed value of evaporation in winter showed that the scheme of fixed value had good applicability in summer and winter instead of the evaporation capacity of the basin. The evaporation in winter was fixed to 1mm showed good simulation results.
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