| With the rapid development of China’s economy and society,the process of in dustrialization and urbanization has been accelerating,the urban population has increased dramatically,and a large number of pollutants have been discharged into wat er bodies,causing serious threats to the water environment.To control the water environment,we must first understand the transmission and diffusion of pollutants in the water body,and predict the effects of different pollution control programs,so as to formulate a scientific and reasonable optimization plan and provide technical support for the determination of pollutant emission control plans.Therefore,it is particularly important to carry out a one-dimensional hydrodynamic and water quality coupling model for river networks.In this paper,river network is taken as the research object,aiming to study the diffusion rule of pollutants in river networks and constructing a one-dimensional hydrodynamic and water quality coupling model.Based on this,a one-dimensional hydrodynamic water quality simulation system of river network is established for the purpose of the river Net water hydrodynamic water quality simulation provides scientific analysis tools.The main research conten ts and innovations of this article include:(1)Based on the Saint-Venant equations and the numerical calculation metho d,the equation solving method for a single channel is analyzed.Based on the three-level solution of the channel-node-river model,the solving steps of the control equations for a complex river network are studied.Based on this,a one-dimensional hydrodynamic model for complex river networks was constructed.To verify the accuracy of the model,refer to the Morris screening method and LH-OAT algorithm for qualitative and quantitative sensitivity analysis of the model parameters.Finally,taking the Yangtze River Hankou to the Hukou Bali River as the actual case,the results of the model constructed in this paper are compared with the results of MIKE11.The results show that the model can simulate the movement law of the water in the river network and can meet the water quality simulation.Computing needs.(2)Based on the one-dimensional convection-diffusion equation,the law of the diffusion of pollutants under different movement patterns of water flow is studied,and the corresponding equations and solutions are deduced.Based on the Dobbins-Camp model,a water quality model with BOD and DO as water quality variabl es was established and its equation solution was derived.Then,with the goal of computational efficiency,the solution method for the control equations under the complex river network was determined,and a one-dimensional water quality model for the river network was constructed.Finally,the actual case analysis and calculation are performed.The results show that the model is stable in structure and can m eet the simulation calculation requirements of hydrodynamic in the river network.(3)Based on the one-dimensional hydrodynamic and water quality model of the river network constructed,the system integration method for one-dimensional hydrodynamic water quality simulation of a universal river network was studied.Det ermine the use of B / S system architecture,with SpringMVC as the system frame work,the background business layer to choose data-centric architecture,to ensure the long-term stability and scalability of the system.The front-end interface is based on HTML and CSS,combined with mature frameworks such as jQuery and Boot strap.At the same time,the professional hydrodynamic water quality simulation specifications are referenced to form a professional and smooth one-dimensional hydr odynamic water quality simulation system. |
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