上游常水位自动控制渠道明渠非恒定流动态边界条件

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。

Dynamic boundary condition of unsteady flow in open canal with automatic constant upstream level control

In this paper,the governing process of the AMIL gate is firstly analyzed andthen the mathematical model of the operation of upstream constant level gate is given. Regarding gate movement as dynamic boundary condition of the canal flow,the mathematical model of the dynamic response of the canal with automatic upstream constant level control is established. Appling Laplace transform, Z-transform and inverse Z-transform to the model of dynamic response of the gate, a difference equation, which describes the gate movement affected by water level in canal, is yielded. Regarding the difference equation and one-dimentional calculating model of unsteady flow in open canal as boundary conditions each other andusing uncoupled method, the equations can be solved so that we can predict thedynamic response of the gate as well as canal, thus improve their designs and managements.