Study On The Problems Of City Water Quality Based On Multi-function River Self-purification Water Demand

With the development of city,the water pollution in the city is more and more serious.It has become an important issue to solve the problem of urban black smelly water body in the development of the city.As an engineering measure to solve the problem of water environment,the water system connected engineering is characterized by quick effect and is beneficial to the rational allocation of water resources.In the water system connected engineering,it is one of the key problems to determine the reasonable water transfer flow.At first,the summary of the research progress is put forward in this paper on China's current situation and river connectivity successes have been achieved,and a two-dimensional hydrodynamic numerical simulation of water quality research progress at home and abroad are summarized,laying the groundwork for the following numerical simulation research.Then the geographical location of the water system in the city center of Haikou,the composition of the water system and the water quality of the river system are introduced.At the same time,the paper puts forward the solution of the water system connectivity and the layout of the connected project in the central urban area of Haikou,so as to determine the research direction and the research question of this paper.Secondly,according to the research results of the original river self purification water demand,multi-function formula of river self-purification water requirement is put forward.Then,according to the population living conditions and the living conditions of the local people in the city of Haikou City,the pollutant loads discharged into the river are quantitatively predicted.Finally,the distribution of pollutants discharged into the river by using the multi zone,the river self purification water demand calculation of the river ecological self purification water demand,so as to determine the water diversion scheme of river connectivity.The theoretical knowledge of this model,using the research and thorough analysis the control equation of one dimensional hydrodynamic water quality and discrete methods pave the way for the theoretical basis for the following one-dimensional hydrodynamic and water quality simulation.At the same time,the two dimensional hydrodynamic water quality equations are also studied and discussed in detail,which is the foundation for the following theoretical analysis.According to the results above the river self purification water demand determined,water diversion scheme combined with the central city of Haikou river basin terrain is established.Then the paper establishs the corresponding one-dimensional hydrodynamic and water quality as well as two-dimensional hydrodynamic and water quality model to calculate the water situation under the corresponding condition of water pollutant concentration changes.It is to determine the rationality of the river system,and provide theoretical basis for improving the water power of the central city.