对圣维南方程组进行离散后，用追赶法对各河道进行演算，由水量平衡原理对各结点进行计算，就可求得河道各断面的水流情况。
After the derivation of the Saint-Venant Equations, water level and discharge of each cross-section are derived by the recursion method and the principle of water balance.
作者通过圣维南方程组的有限差分数值解并使用比例控制方式，编写出计算机程序，实现了自动上游控制灌溉渠道系统的计算机模拟。
Based on the numerical solution of Saint Venant Equations and proportional control mode, the author established a computer program for simulating automatic upstream control irrigation canal system.
根据圣维南方程组的连续方程，在原有相应涨差模型的基础上，推导出一种新的河道实时洪水预报相应涨差模型。
According to continuity equation of Saint_Venant, and based on the old corresponding rising difference model, the paper developed a new model of channel flood realtime forecasting.
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