Water Quality Simulation Of Minjiang River(Outside The River)Basin In Xinjin

Water quality model is a mathematical model which accord to the principle of conservation of substance the language of mathematics and methods to descripte the changes that Physics, chemistry, biology and ecology aspects of the changes in the water quality component of the water column, the inherent law and the in-terrelation.Is a water environment research tools which plays an important role during the water pollution control and water environment quality planning, prediction of water quality, water environment capacity calculation and water quality early warning and forecas-ting.First,the paper uses QUAL2K water quality model which developed by the U.S.Environmental Protection Agency to simulate river water quality in Min-jiang river (outside the river) basin Xinjin section. This article was informed that the exit section of water pollution factors is TN,TP by analysising the water quality monitoring data of basin exit section "the Xinjin Yue Dianzi",and useing single factor index to evaluate section of water. Second, Collected and surveyrd emissions of pollution sources in this river basin.Generalized the points of pollutants in river basin input and water output. Simulated the value of exit section’s water indicators such as CODcr,TN,TP. Calibrated and correctde model parameters by contrasting monitoring data.Then verificated the applicability and accuracy of the simulation in river basin water quality by QUAL2K model.Last, forecasted the changes of TN,TP in the river mainstream along.Analysised conditions of exit section’s water quality compliance.The results show that QUAL2K model can better simulate the water quality. The relative error between simulation results of monitoring data are less than15%.When the river Mainstream flows through the Xinjin County,the values of TN and TP are maximum.lt can be seen that pollutants discharged into the seg-ment of river greatest impact on exit section water quality. It can be achieved that the exit section’s water quality satisfy criteria through perfecting urban sewage pipe network, improving the rate of domestic sewage treatment in city and town, reduction of emissions of industrial enterprises’TN,TP and so on.