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The article analyses and predicts the hydrodynamic feature of study area on the basis of mike21 numerical model. It is by the two dimensions pollution diffused simulation method based on the hydrodynamic model. And then it predicts the contributed concentration field of the waste water. Based on the NH3-N in discharge of sewage, it contrasts the impact on water quality in the Yangtze River of the...
This paper is concerned with the numerical solution of two-dimensional flows. The technique of boundary-fitted coordinate system is used to overcome the difficulties resulting from the complicated shape of natural river boundaries; the method of physical fractional steps is used to solve the partial differential equations in the transformed plane; and the technique of moving boundary is used to deal...
This paper presents a numerical method to simulate the 2D tidal flow and water quality under the orthogonal curvilinear coordinates. In order to overcome the computational difficulties in natural rivers, such as the complicated boundary figures, the great disparity between length and width of computational domain, etc., orthogonal boundary-fitted grid is used, the irregular domain in physical plane...
Soil and water loss is an important source of water eutrophication. In this study, soil erosion were measured in the four types of cultivated lands (Paddy land, Terraced farmland, Sloping farmlands <; 25°, and Sloping farmlands ≥ 25°) in Xiaojiang River basin, Chongqing of China. In addition, water qualities were investigated in 5 reaches of Xiaojiang River (Qukou, Yanglu, Gaoyang, Huangshi, and...
Water quality maintenance is always a focus in a fishpond in order to achieve a high harvest and good scenery. A wetland fishpond in Yingdong Village on Chongming Island, Shanghai has been studied. Through a 2D modeling analysis it is found that the water diversion from the neighboring Yangtze River is feasible and effective. The diversion can be conducted once every 2 months to achieve the desirable...
The aim of this project is to develop a river water pollution predictor. We present an improved Grey-based prediction algorithm to forecast the trend of the river water pollution. We adopted grey prediction as a forecasting means because of its fast calculation with as few as four data inputs needed. However, our preliminary study shows that the general Grey model, GM (1, 1) is inadequate to handle...
This paper presents a numerical method to simulate the 2D tidal flow and water quality under the orthogonal curvilinear coordinates. In order to overcome the computational difficulties in natural rivers, such as the complicated boundary figures, the great disparity between length and width of computational domain, etc., orthogonal boundary-fitted grid is used, the irregular domain in physical plane...
The vegetation restoring model district lies in the southeast of Honghu Lake which is interlinked with the Yangtze River through the river course. Based on the field investigation and test, this paper applies the fuzzy mathematical principle and uses five parameters to assess the water quality of the model district. Inferring from the fuzzy concept, which is more objective comparing with other assessment...
This article first elaborates the evolution of human-water relationship in the middle reaches of Yangtze River. In the ancient times, natural habitats of the human species were centered around large water and grass rich areas. People maintained an orderly and complete relationship with the water-environment, with the progression of time agricultural societies, begun to exploit the Two-Lake Plains...
One-dimensional DYRESM-CAEDYM model was used to study the effect of water transfer project on water quality of Chaohu Lake, which is situated in central Anhui Province, the lower reaches of Yangtze River. The simulated results of temperature, TN, TP showed good agreement with observed data in 2005. There was also good agreement between monitored data and simulated concentrations of chlorophyll-a although...
The polluted water discharged into natural water body is one of the most important factors that contaminate water quality. Generally, there are many pollution sources in a reach of a river. According to the polluted water discharge feature, water pollution sources are divided into two types of continuous and discontinuous. For the continuous, the certain method is used to determine its amount of pollutant...
Compared with the traditional method of water quality management, using remote sensing technology in monitoring the water quality has a wider application perspective. For a water body of large scale, the Moderate resolution Imaging Spectroradiometer (MODIS) is more appropriate data for its high temporal resolution for timely and dynamic monitoring, moderate spatial resolution and no charge for acquiring...
Water pollution has posed a severe problem in modern society. Evaluation of water quality is a meaningful topic today. To identify the specific water category and predict the water quality in the future, a particle swarm optimization (PSO) based artificial neural network (ANN) approach is presented. The data investigated from the Yangtze River are chosen as the original cases to construct the ANN...
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