Abstract: After analyzing measured data of the Three Gorges Reservoir in recent years，one-dimensional mathematical model was established; the Three Gorges Reservoir 175 － 145 － 155m under normal water operating characteristics of the flood stage water level along were verified after measurement and calculation． The results of early calculations with Changjiang River Scientific Research Institute were compared． The results indicated that with little difference between the two level values in same calculation conditions，the two were consistent． It hold that the early results could be regarded typical and instructive．

Key words: Three Gorges Reservoir, water surface, roughness, one-dimensional mathematical model

摘要： 建立一维数学模型，通过三峡库区成库后已取得的实测资料进行验证，计算出三峡水库175 ～ 145 ～ 155 m 正 常蓄水运行阶段下特征洪水的沿程水位，对比校核了长江科学院早期计算成果。结果表明: 两者在相同计算条件 下的水位差值不大，总体基本一致，认为长江科学院早期成果有一定的代表性和指导作用。

关键词: 三峡水库, 水面线, 糙率, 一维数学模型