Research On Hydrodynamic-water Quality Model Of Lake And Parallel Computing Method

With the acceleration of urbanization and the development of social economy,the water environment of lakes in China has been polluted to different degrees,which has seriously limited the sustainable development of our society.It is urgent to carry out the prevention and control of lake water pollution.This paper focuses on the social needs of lake water environment remediation,takes the lake hydrodynamic and water quality model as the theoretical basis,numerical simulation and computer technology as the means,and provides important theoretical and technical support for exploring the temporal and spatial variation rules of lake flow field and pollutants..The main research contents and innovative achievements of this paper are summarized as follows:(1)Based on the principle of hydrodynamics and the mechanism of material migration and transformation,a two-dimensional hydrodynamic and water quality model of lake is established.Taking the East Lake of Wuhan as the research object,the characteristics of wind-driven flow and the law of water quality change of the East Lake are simulated and analyzed.(2)A new water diversion scheme of East Lake is proposed,which uses gravity flow as the main way of water diversion,and the pump flow as the subsidiary way of water diversion.The actual requirements of flood control and drainage in East Lake during flood season are also considered.The simulation analysis of the water quality improvement effect of East Lake diversion shows that this scheme is a feasible water diversion scheme.(3)In view of the shortcomings of hydrostatic hydrodynamic model in simulating water body with obvious non-hydrostatic pressure distribution characteristics,a twodimensional non-hydrostatic hydrodynamic model is established,and an improved ADI method is used to solve the model.The simulation results of the propagation process of solitary wave and sine wave in various terrain conditions show that the model has high simulation accuracy.(4)A parallel computing method of two-dimensional hydrodynamic model based on thread pool is proposed to improve the computing efficiency of the model when the scale of water bodies or number of grids is large.The parallel computing method divides the computing tasks of the model into several independent subtasks based on the divide and conquer strategy,and then uses the thread pool technology to create and maintain multiple thread to dynamically process the subtasks.The results show that the hydrodynamic model based on parallel computing has a good acceleration effect,and the computational efficiency is improved obviously.