Internet-based Water Quality Online Monitoring System Of Three-gorge Reservoir

As the development of network technologies, Internet is integrating computer systems and communication systems in the world, forming information superhighway and public data network. How to monitor and control objects that are scattered in a wide range via Internet is one of the hot spots in automation field. Researches about applications of Internet in various remote monitoring and controlling system have been made much abroad. But research of Internet-based water quality online monitoring system of three-gorge reservoir is a new application in environmental monitoring field. Water quality monitoring is characterized by extensive district, disperse monitoring stations and inconvenience of data acquisition and management. Issues that water quality auto monitoring technologies aim at are to realize remote data acquisition, and then automate the whole process of data transfer and process. Water quality monitoring technologies in China are still in a low level in automation and information, and it is hard for different utilities to share information. A top priority task is to raise automation level of water quality monitoring work, and seek an open, cheap network to share data among different utilities, which also represent a technical trend.From the point of overall structure and remote data acquisition technology based on Internet, monitoring scheme is demonstrated, designed and the software model is discussed. At first, basic theories about Internet-based water quality online monitoring system of three-gorge reservoir is presented. Upon that, remote data acquisition scheme based on ActiveX and OPC is designed.The system adopts B/S model, combines the network communication technology and the data-base technology.It uses ActiveX control to monitor real-time water quality information.According to the require of the online monitoring water quality,it refers to three method to collect the water quality information(including automative collection, real-time cellection and alarm),and issues the information though WEB server.As considering spatial distribution of water quality data, GIS is used in Internet-based water quality online monitoring system of three-gorge reservoir. In addition, in order to save the cost of hardware equipments and guarantee the data's completeness, the optimization of the water quality monitoring points has been researched and the revised TOPSIS algorithm for optimizing monitoring points.At last, according to the requirement of water quality monitoring, data...