Research On Water Quality Simulation Based On Hydraulic Model

The water distribution networks system is an important infrastructure of the city.Establishing the hydraulic model and water quality model of the water distribution networks system,It has become a modern technical method for planning and designing,management and assisting decision-making in water distribution networks system,It is an inevitable way to achieve the modern management of water distribution networks system,and is the development direction of technological progress of urban water distribution networks system.Taking regional water distribution network in a district of Tianjin as an example,using the data monitoring collection system,geographic information system,CAD completion map and the basic data provided by the relevant technical personnel,and combined with field data to establish a water distribution network hydraulic model,check and analyze the topology of the pipe network and the accuracy of the data simulation,the precision of the model has reached the requirement of the model working condition.The result of hydraulic calculation can be used as a reference for the analysis of the actual pipe network and the formulation of the corresponding scheme.There is no water quality monitoring point inside the area distribution network of a district in Tianjin,so the real-time water quality data of the pipe network can not be known in time,and the perfect water quality model of the pipe network is based on the accurate real-time data.Through the study of previous research results,the experimental plan of water quality detection is worked out.According to the experimental scheme,the representative target pipe is selected,and then the field measurement is carried out.Finally,the measured data are arranged and analyzed.The four items of water quality data are in line with the actual operation of the pipe network,which can be used as the data basis for the water quality modeling of this pipe network.The water quality models of pipe network can be divided into many kinds.There are only two conventional water quality models,the residual chlorine attenuation model and the water age model of the water supply network.The key of establishing accurate residual chlorine attenuation model lies in the checking of the residual chlorine attenuation coefficient of the main water and wall water of the pipe network.Through the previous research results and the main body water reaction formula and theoretical considerations,the attenuation coefficient of residual chlorine in main body of water supply network is finally determined to be 0.265d^-1.The attenuation coefficient of residual chlorine in pipe wall is checked by the combination of particle swarm optimization and modeling software EPANET2.0.Finally,when the number of iterations is 100 and the particle size is 30,the water quality simulation is the best,and the tube wall reaction coefficient is the final value at this time.The water age model of the water supply pipe network is realized by the water age simulation function in the modeling software.It is concluded that the percentage of water quality in the area,the percentage of grade one is about 77.64%,the percentage of grade two is about 4.3%,and the percentage of grade three is about 18.06%.The results show that the water age of the area is smaller.For the three level water quality gathering area,take corresponding measures to ensure water quality safety.By establishing the hydraulic and water quality model of the water supply network in a district of Tianjin,we have mastered the dynamic working conditions of the running system of the water supply network,and formulate the corresponding solutions to the problems of hydraulic and water quality in the pipe network.For the users,it can drink more safe and more safe drinking water;for the Water Service Company,it improves the level of management service and the efficiency of the company.