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本文在分析灌溉渠道上游常水位闸门（即ＡＭＩＬ门）动态过程的基础上，建立了以闸门运动为动态边界条件的明渠非恒定流计算模型．通过对闸门动态过程数学模型的拉氏变换、Ｚ变换和Ｚ反变换，列出了描述闸门运动受水位变动影响的差分方程，将其与描述明渠非恒定流的一维计算模型互为边界条件，用非耦合算法计算，可以预报系统的过渡过程，为渠道和闸门的合理设计提供依据．
Based on the analysis of the dynamic process of the upstream and downstream normal water level gate (AMIL) at the irrigation canal, a non-steady flow calculation model of open channel with gate motion as the dynamic boundary condition is established. Through the Laplace transform, Z transform and Z inverse transform of mathematical model of gate dynamic process, the difference equations describing the gate motion affected by water level changes are listed, which are mutually boundary conditions with the one-dimensional calculation model describing unsteady flow of open channel , Calculated by the uncoupled algorithm, can predict the transition process of the system, provide the basis for the rational design of the channels and gates.