Study On Simulation And Control Of The Regional Flood Control System

Among various disasters in the world, flood disaster happens in a high frequency and causes great damage to human society. So when seeking for the vigorous socio-economic development, flood should be coped with to minimize the losses caused by it, to make full use of the flood, i.e. cleaning the ground surface and rivers, supplying ground water, maintaining lakes and meliorate soil, etc.. All the approaches should be done through following the natural rules of flood. Therefore, flood control should consider both the project-related approaches and non-project measure, together with the hardware and the software development. Only by attaining so, can the efficient flood prevention commanding centre be realized.This dissertation discusses the simulation and control of flood in Rujiang River and Ruhai River based on the flood simulation models. Saint-venant equations describe the channel flow movement, and the solution of the nonlinear algebraic equations was obtained through discretization of Pressman weighted implicit four-point genre with the matching pursuit method.The dissertation reveals the application of robust H_∞control theory, one of the optimized control theories, to the flood control process to seek for an easier way to explain the application of robust control theory in resolving the flood control issue, the subject was demenstrated with the state space methodology which is followed by discretizing and linearzing the St.Venant Equation based on the flood simulation and control model. In order to apply the robust control theory into the river, system stability was analyzed, weight function and augmented matrix, as well as the design of optimized H_∞control devices, were selected and calculated. And then the feedback matrix can be obtained. The flood of Ruhai River and Rujiang River was taken as a case study to validate the model's feasibility. Tamura's model was also used to consider the time lag of water in the two rivers.The application of robust H_∞control theory to the flood prevention system is still immature without a precedent in real application after a great many of researcher's hard work and hence requires further research. A primary exploration on the subject was made in this study, hoping it could be inspiring for the future research.