Study On Water Quality Of Luanhe-Tianjin Water Diversion Project

The project of introducing and sinking into Tianjin is a large-scale water diversion project across the river in Tianjin.The Luan River has become the main source of water supply in Tianjin,with an annual water supply of 1 billion m3 to Tianjin.The quality of its water quality will have a profound impact on the economic construction of the water area and peopled lives.With the economic and social development,the population has increased,and the industry has contimied to improve.This has also brought about a certain impact on the water quality of the flood control.This paper combines the water quality conditions over the years and studies the water quality of the project.Firstly,through the analysis of the detailed data of the water quality monitoring of the main control section along the collected 1987 to 2012,due to the limited data in the calendar year,the measurement technology was limited at that time,and the data with more perfect indicators were selected for research.Eight pollution indicators,such as dissolved oxygen,permanganate index,five-day biochemical oxygen demand,almonia nitrogen,nitrate,total phosphorus,and total nitrogen,were used as the main research objects to conduct interannual trend analysis,water quality evaluation and prediction.According to the trend of water quality change along the route from 1987 to 2012,except for the impact of sewage discharge on the Shahe Bridge and Guohe Bridge Station in a few years,the water quality has changed suddenly,and the annual water quality changes of the remaining stations are basically small.The single factor and grey correlation method were used to evaluate the water quality of the monitoring section along the raft,and the water quality status was determined.The evaluation results of the two evaluation methods were compared and analyzed,and the single factor evaluation result was selected as the water quality result along the raft.The single factor evaluation results show that the majority of the water quality along the sputum sputum is classified into Class ? and Class ? waters without considering the total nitrogen content.However,in the case of total nitrogen participation,the water quality along the sputum is basically Class ? and Class ?.The water quality and total nitrogen content are far exceeding the standard,and appropriate measures must be taken to reduce the TN content to ensure the safety of water supply.The improved BP artificial neural network method and GM(1,1)gray system prediction method were used to predict the trend of water quality in 2020.The prediction results show that in the long series of water quality prediction,the BP neural network method simulation effect is better than the gray system prediction method prediction result,and the results have reference value and significance.Suggestions on monitoring,control,management and control measures along the route,to better manage the water quality along the route,and to further grasp and improve the water quality along the route,providing reliable basis and technical support.