Patent Document ID: 4522534
Application ID: 06577971
Patent Flag: 1

Claim One:
1. A control method for an open channel performed by using an open channel control system comprising gate means for opening and closing the open channel, estimating means for estimating values of parameters of a state in a plurality of reaches into which the open channel is divided by said gate means, and control units for controlling a degree of opening of the gate means on the basis of estimated values of the parameters of a state, such method comprising the steps of: representing each of the reaches by a three water tank model comprising three imaginary water tanks connected in series with one another and two imaginary conduits connecting the two adjacent imaginary water tanks with each other; selecting, as the parameters of a state, liquid levels of the imaginary water tanks, flow rates in the imaginary conduits and a flow rate of diverted water from the reach; providing the three water tank model with equations including the selected parameters of a state; estimating, in the estimating means, future values of the selected parameters of a state by solving the equations; determining, in the control unit, the degree of opening of the gate means so as to keep a liquid level of the reach constant on the basis of the estimated future values of the selected parameters of a state.