为了保证灌溉渠道运行安全、合理调配水量，研究单一渠段的非恒定流过渡过程对促进灌溉管理水平是十分必要的。通过考虑灌溉渠道的不同运行方式以及节制闸的不同调控等综合影响，按照灌区常用的渠段上游常水深运行和下游常水深运行 2 种运行方式，应用渠道非恒定流数值模拟的特征线法及矩形网格计算格式，对梯形断面渠段由于不同闸门调控方式所引起的非恒定流过渡进行模拟，比较 2 种运行方式以及预报出各级节制闸调闸时间提前量，全面地反映系统动态并且较明确地模拟闸门调节过程。

To research unsteady flow transition process in a single irrigation canal stretch for the purpose of ensuring the safe operation of irrigation canals and rational allocation of water, we consider adopting different operating modes, as well as different gate regulation modes etc., under the two operation conditions of constant upstream water depth and constant downstream water depth, conduct the canal unsteady flow numerical simulation with the rectangular grid characteristic method in the trapezoidal cross-section under the different gate controls, and compare the results of two operating modes and forecast time in advance to control the sluice at all levels. So, the results can fully reflect the dynamic and more precise adjustment process.