Delft-3D software system was designed by the water power academe of Netherlands(Delft Hydraulics).And it could be used to simulate the changes of hydraulics and water quality in two directions or three directions.The models not only think of complicated hydrodynamics questions and transportation process,but also think of many physical chemical and biological reciprocity,which makes the results more credibility and reliable.By using Delft-3D,the water quality of the first three years in Huadao Reservoir was ...