Abstract: The measurement control system of Shenzhen estuary tidal model consists of the measurements of water level, velocity and discharge, and sand adding control in model, as well as the tide generating control equipments. For the flow characteristics of Shenzhen estuary tidal model, the system device used is of a high-performance tracking of water-level grating instrument, an AI optical rotary pulp water velocity meter and an AI flow meter, designed circulation pipes in sand adding, as well as designed and developed the tidal simulation system which is based on frequency conversion and speed adjustment technology. The simulation system used the serial-communication of industrial-control machine and converter for the remote control of the trial process, real-time control of the opening angle and running speed of the gate, and, moreover, adopts adjusting instantaneous water quantity in and out of the model to achieve a more accurate simulation of tidal waves.The model experiment practice shows that the control system is of high accuracy, good stability, and can solve the difficulties of variable over-flow wide entrances and accurate simulation of tidal. Through the design and application of this system, the measurement technique for tidal model test has reached a new level.

Key words: Shenzhen estuary, tidal simulation, frequency conversion, measurement control