Abstract: For managing and forecasting water environment effectively, it is worthy of investigating the technologies for integrating water quality models with water environment information system because of their complementary action in water environment protection. To enhance the function of forecasting water quality in the information system on control of water pollution and management of water environment in Three Gorges Reservoir (TGR), five water quality models for solving different kinds of water pollution problems existing in TGR at present are selected and integrated with the information system. With the discussion and the comparison, the advantage and disadvantage of the technologies for integrating water quality models with the information system, a semitight integration technology is applied to achieve the selected water quality models embedding into the information system on management of water environment in TGR. By developing the code of preprocessing module, postprocesssing module and interface module, the multilayer finite element model makes an example of blending water quality models into the information system on management of water environment in TGR. The successful simulation of water flow fields and water quality in Wanzhou Reach of TGR computed by the integrated water quality model shows that the method of integration with the technologies of GIS, database and graphics interface both enhanced the ability of forecasting and analyzing water quality in the information system and improved the models' simulating efficiency by means of automating data preparation and date transfer as well as graphing the simulating results conveniently which also makes models much easier for users. The present work constructs an information system on management of water environment in TGR with five water quality models suitable for the actual condition of water pollution in TGR and it will servey as an effective tool for controlling water pollution and protecting water environment in TGR.

Key words: Three Gorges Reservoir, water environmental information system, water quality model, integration