Chongqing Yangtze River Bend Flow And Water Pollution Segments Range Simulation

Three Gorges Project on Ecology and the environment are of great concern at home and abroad. Over the years, the Yangtze River Water Resources Commission Ministry of Water Resources, Chinese Academy of Sciences and other domestic departments, research institutes, universities, all have been involved in the Three Gorges Project of the many ecological and environmental factors in-depth investigations and research work, made a large number of research data and results, at present, has a theoretical basis and application of the results of the model prediction and evaluation of water quality have been some, in a complex flow conditions, the spread of pollutants and attenuation of less, most of the models are still limited to the ideal r. segment, particularly the proliferation curve of pollutants within the literature related to less.This paper studies the water quality of domestic water review paper introduces the application of water quality model research progress, particularly after the Three Gorges reservoir, the water applied to the Three Gorges Reservoir water quality model of the application. Stream water quality model using MIKE11 the Yangtze River Three Gorges Reservoir Cuntan. Longevity segment model, respectively, the water level by the paragraph in the case of a certain roughness coefficient and diffusion coefficient of typical pollutants and degradation coefficients for the fine water quality model provides the basic parameters of the data. In the one-dimensional water quality model parameters based on the data flow through the two-dimensional water quality model for river bend is divided into 9 different coordinates of the outfall of the sewage outfall in the river bend a position on the spread of pollutants and degradation with to influence. Study found that the concave bank of natural river bend range of pollution concentration distribution with more significant impact in the river bend range significantly reduced, while the maximum width of contamination with larger. Natural convex bank of the river bend with a concentration range of distribution of pollution has a smaller influence on the changes in the length of the pollution belt has great influence on the length of the dispersion of pollutants significantly reduced, while the maximum width of pollution with changes also greater impact. In a two-dimensional flow model based on that, through the three-dimensional flow model calculation, analyzed the velocity and flow of the relationship between the diffusion area, the results show that the contaminant belt length and the longitudinal velocity relationship, exponentially appears good correlation; River bend of the contaminant concave bank with maximum width and transverse velocity on a parabola relation, curve correlation coefficient are larger than 0.95 , have shown a good correlation between the convex bank in the meandering lower correlation coefficient, indicating that the flow in river bend concave sides and convex bank different flow characteristics and sediment erosion and deposition on diffusion of pollutants have a more significant impact.Turn water flow and sediment movement essentially belongs to the multi-phase, meanwhile flow and the spread of pollutants in its essence, also belong to multi-phase, with single-phase flow model numerical simulation error is bigger, establish solid-liquid two-phase flow sediment multiphase flowing water flow water even bend mathematical model to simulate the spread of pollutants water environment field is scope will be one of the important research direction.As an objective system of water environment there are a lot of uncertainty, if you want a more accurate and true reflection of the water environment system in a variety of phenomena, can not be simply a factor to analyze, but taken together, to the maximum limits of mathematical model to eliminate the error caused.