Chongqing Two River Water Quality Prediction And The Influence Analysis For Water Intaking Of Downstream

Changjiang river and its tributary jialing river are two main rivers of chongqing. Confluencesegment of this two rivers belong to the multi-function water and urban drinking catchment area ofcity. It playing an important role in the urban water supply, shipping, water conservancy andindustrial and agricultural production, etc. The water quality in it is directly related to the economicconstruction in chongqing and the sustainable development of society. In this two rivers distributemany Drain outlet and water intake. In the upper reaches of the drainage outlet will directly orindirectly affect the downstream water intake of water quality. Therefore, the upstream waterquality monitoring is the effective guarantee for urban residents downstream water safety is veryimportant factor.This paper, by using mathematical simulation method to simulate the two bus section waterquality. Thus for the downstream water, water safety conditions provide a basis for evaluation, butalso be able to sudden water pollution accident water quality simulation and forecast to providetechnical support, has an important practical significance and application value. First, the waterquality of jialing river and changjiang river in chongqing city section are analyzed, and two of thewater intake and drainage outlet were investigated respectively, and the water near the sampleanalysis, survey drainage outlet water quality section pollutant concentration of background.Simulating the water quality of three gorges reservoir in its175m (dry season) water level,145m(wet season) water level and its normal circumstances and risk dump two cases. The water qualitysimulation using the DHI MIKE21model. Simulation process the analog waters of thehydrodynamic numerical simulation, Then in the hydrodynamic simulation results on the basis ofwater quality simulation. In the simulation process first determine the eddy viscosity coefficient,bed roughness coefficient, pollution source, the initial water level, boundary conditions and otherrelated parameters, then using the measured data of bed roughness coefficient and the rate constant,results is basic tally with the actual situation. Thus have the two-dimensional water qualitysimulation results of20control sections for three gorges reservoir in its175m (dry season) waterlevel,145m (wet season) water level and its normal circumstances and risk dump two cases.Through the water quality simulation results, evaluate the urban drainage outlet and source ofdrinking water intake layout reasonable, In order to put forward improvement measures. Accordingto the water quality forecast and analysis results for three gorges reservoir in145m and175mwater level during accident discharge. Along the changjiang river,13protection zones of class aand b(contain dajiangchang city drinking water) in drinking water source are no potential risksource exists, so does not need to carry on the adjustment.11protection zones of class a (containchenjiangzhen village drinking water) in drinking water source have potential risk source exists,else20protection zones of class b (contain chenjiangzhen village drinking water) in drinking watersource have potential risk source exists.