Automatic Downstream Control Systems for Irrigation Canals.

摘要

Automatic downstream control systems could successfully operate many existing and proposed irrigation canals. With these systems,the offset of the downstream water level in a canal reach determines the upstream gate opening. A generalized mathematical model is developed for a canal reach with downstream control,from which parameters are determined for the HyFLO and Smith controllers. The HyFLO controller consists basically of a simple hydraulic filter,and the Smith controller incorporates a Smith Linear Predictor. Tests in a numerical model indicate that regulation is satisfactory with both controllers;however,the Smith controller provides somewhat improved performance and might be considered as an alternative to computer operated remote control.