中文摘要：

将伽马非正交函数族和勒让德正交函数族作为系统响应函数,以此建立地面径流汇流预报模型,同时,为进一步比较模型计算结果的优劣,还选用了纳西瞬时单位线汇流模型与之进行对比分析,并对王英水库2005年的4次洪水过程进行了预报试验。结果表明,选择的3种汇流模型中,纳西瞬时单位线汇流模型的试验效果最好,其次是伽马函数族汇流模型,最后是勒让德函数族汇流模型,其平均确定性系数分别为85.54%,83.86%,80.97%。

英文摘要：

The surface runoff confluence model is established taking the Gama nonorthogonal function family and Legendre or-thogonal function family as the systematic response functions. Meanwhile, the Nash IUH （ Instantaneous Unit Hydrograph） rou-ting model is chosen to compare the calculation result. Four flood process of Wangying Reservoir in 2005 are chosen as forecas-ting test. The test results show that the IUH routing model has the best calculation result, the second is Gama nonorthogonal func-tion family model and the last is Legendre orthogonal function family model, and the average certainty factors are 85. 54%, 83. 86%, 80. 97% respectively.