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In view of the defect of traditional water quality evaluation model, a probabilistic neural network (PNN) is developed to evaluate surface water quality in Jining. Probabilistic neural network is a new type neural network consisting Radical Basis network and compete neural network, which is simple in structure, easy for training and wide used. PNN model is applied to evaluate water quality at representative...
With the development of social and economic, the pollution in river is worse. It is very important to study river pollution. In view of the uncertainty of river water pollution, Velocity and dispersion coefficient and attenuation in river are considered as uncertainty parameters and expressed as grey parameters. One dimensional gray numerical water quality model is developed according to gray theory...
In view of the deficiency of classic method evaluating water quality. A grey relational analysis model is proposed to evaluate water quality in river. The principle of grey relational analysis and its process are introduced. Suzhou river was selected and assessed by using this method. And it was found that, compared with the fuzzy complex judgment method, the result was remarkably different. The possible...
In view of the defect of traditional water quality evaluation model, based on fuzzy neural network theory, a new model of fuzzy neural network (FNN) comprehensive evaluation is developed to evaluate surface water quality in Suzhou. Fuzzy neural network is a new type neural network consisting radical basis network and compete neural network, which is simple in structure, easy for training and wide...
In view of the deficiency of the traditional methods, a BP neural network model is proposed to evaluate water quality. The proposed model was applied to evaluate the water quality of 20 sections in Suzhou river. The evaluation result was compared with that of the RBF neural network method and the reported results in Suzhou river. It indicated that the performance of proposed neural network model is...
Based on a series of research works on water environment monitoring and water resources protection in Dongting lake, this paper discusses the strategy of sustainable development about the requirements of water function and protection objectives, and quantitatively analyzes the variation trend of water environmental capacity of major pollutants before and after the running of the three Gorges project...
Based on the grey theory, grey characters of river environment system are analyzed, the velocity and dispersion coefficient and attenuation in river are considered as uncertainty parameters and expressed as gray parameters. A grey differential equation of contaminant diffusion in river is built. And the equation has special structure. The truncation error of finite differential method in solving the...
This paper deals with the study of the water quality assessment through application of BP neural network. Water quality of Sanmenxia Reach in Yellow River is evaluated by using BP neural network and compared with grey clustering method. The result indicates that BP neural network model can resolve complicated non-linear relation between evaluating gene and water quality grade, and the method is convenient,...
In order to manage the water resources well, regional water resources management decision system, based upon surface water, groundwater and atmosphere water information data base and focused on numerical simulation models, is set up by use of numerical model and computer technique, according to idea of decision-making variable deduction. It can afford a series of dynamic and scientific decision for...
Pollutant factors of water quality for basin and their relationships are the key factors for basin water pollution control and environment management. However it is difficult to obtain sufficient ascertained influence factors information in agricultural non-point source pollution control and modeling aspect especially for the application of large scale models. So in this paper based on environmental...
Contaminant transport in underground system usually occurs in varied flow fields and in anisotropic and heterogenous media. Because the applicability of analytical solutions is extremely limited for such conditions, and the distribution and transport of pollutants in groundwater are controlled by physical chemistry and biology courses, which include advection, mechanical disperse, molecule spreading,...
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