| Simulating and predicting the water quality is an important method for researching on behavior of contamination in water environment, and it provides science evidence for successfully accomplishing the tasks about water environment.The paper ascertains two dominating pollution indicator namely permanganate index and ammonia nitrogen by analyzing water quality condition and pollution source of mainstream in Dongjiang River. On the basis of hydrodynamics characteristic of natural river way as well as the pollution transportation character, 1-D hydrodynamic model(Saint.Venant equation) and 1-D advective-diffusion water quality model are established, in which Preissmann weighted implicit scheme is used, and water quality model is solved by Tomas implicit scheme to obtain pollution concentration. In the process of calculation, combined with advanced data-processing software MATLAB6.5, which has powerful numerical calculation function, the paper works out a hydrodynamic and water quality model procedure for a reach the mainstream of Dongjiang River in Huizhou City, in which each hydraulic factor of main inspecting sections is calculated by anomaly section procedure. The water quality parameter is obtained by the integrated decline coefficient as well as experience formula. After validating the relative difference between simulation value and field measured value can be controlled in a definite scope. Then the model system is applied water quality simulation of the target main sections in different hydraulic conditions and the simulation result is analyzed and forecasted. Finally, Based on Visual Studio 2005 software development platform, combined with ArcGIS Engine control unit, the paper develops a 1-D water quality visualization system and realizes the dynamic 1-D water quality visualization demonstration of rivers.
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