Research On The Simulation System For The Water Level And Flow Velocity Of River

Water level and flow velocity are deduced as channel simulation of the most basic and the most critical step, a direct impact on the accuracy, instant and applicability of a channel simulation system, and have been subjected to the attention of water conservancy simulation in research of the field, and current a lot of research are done and some results are obtained. However, due to the complexity and variability of the river scene, a variety of the deduction method for water level and flow velocity also need to change, so the research on the method of deduction is still faced with many challenges. It has important theoretical significance and extensive application value to study how to improve the effect of the deduction for water level and flow rate.In this thesis, the Simulation System for the Water Level and Flow Velocity of River is designed to solve the problem of deduction for water level and flow velocity, and introduced the deduction simulation of pollutants which simulates the situation of pollutants changed in river according to water level, to obtain experimental data and analysis, and last verified the effectiveness of the system, provides an important experimental basis for channel simulation research. The main work is as follows:1. According to the general flow of system simulation, this thesis introduces the basic knowledge of system simulation and river simulation. Firstly, the basic principle and process of the system simulation are introduced, and then the related modeling techniques and software are introduced briefly. Finally, based on this, the method of constructing the Simulation System of the River Water Level and Flow Velocity is studied deeply and designed, and the related modeling is carried out.2. In view of the terrain of simulation river is complex and changeable, and the low efficiency of real-time simulation deduction, design the two modules of simulation deduction, respectively the module interface of EFDC (Environmental Fluid Dynamics Code) and the module of design algorithm. The module interface of EFDC is to use EFDC hydrodynamic model to deduce precisely the water level and flow rate, but its iteration speed is not ideal. the module of design algorithm use derived or design algorithm by self for fast deduction. this thesis use the improved Newton iteration method and interpolation method to derived the water level and flow velocity introduced this system, in order to improve the efficiency of deduction in the system to meet the requirement of real-time simulation.3. The system consists of four modules:one is the database access module, the two is the EFDC water power interface module, the three is the design algorithm module, and the four is the simulation function module. In this system, the simulation experiment is carried out, and the accuracy and convergence of the EFDC hydrodynamic model, the Newton iteration method and the interpolation method are analyzed and compared. The experimental results show that the system meets the requirements of accuracy of water level and flow rate and the requirement of real time.