为了探究不同质量和精度蒸发数据对降雨径流模拟的影响，选取E60l蒸发皿蒸发数据、离散化的Thornth-waite经验公式计算的潜在蒸散发和将固定值作为蒸发数据3种来源的蒸发资料作为输入，利用新安江模型分别对屯溪流域1981一2004年的径流过程进行模拟，对比分析了3种数据对径流模拟结果的影响，结合年内各季节误差规律，分析了不同季节对蒸发数据精度的敏感程度。结果表明，蒸发皿蒸发、公式计算蒸散发和固定值的模拟结果 确定性系数均值分别达到0.90、0.89和0.86，公式计算蒸散发值适用性较好；在季节尺度上，季节内蒸发存在趋势性变化的春季和秋季对不同来源的蒸发数据更加敏感，对流域潜在蒸散发的精度要求更高；通过优化冬季蒸发的固定值模拟结果显示，使用固定数值代替流域蒸发能力的方案在夏季和冬季适用性较好，其中冬季蒸发固定1mm时在降雨径流模拟中可以取得较好的模拟效果。

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.

国家重点研发计划（2016YFC0402705);国家自然科学基金项目（51679061;41130639）；江苏省商校自然科学研究面上项目(l7KJB170015)