Research On Automatic Classification And Security Dissemination Technology For Water Quality Early Warning System

Security dissemination of early-warning information is one of the important functions to water quality early-warning system. It can precisely release the real-time water quality warning information to user terminals through multiple channels before the occurrence of water quality events, which have a significance on ensuring the drinking water safety and improving the rapid emergency response capability.Combining with the research and application of water quality safety assessment and early warning technology supported by the National Key S&T Special Projects "Water Pollution Control and Treatment" (WPCT), this thesis mainly focuses on the investigation and application of automatic classification and security dissemination of warning information; water quality monitoring and early-warning dissemination platform design and development; and accomplishing the functions of multiple-channel sending and multiple-terminal reception of the early-warning information with variety requirements of the demonstration cities.The main achievements of this thesis are listed as follows:1. To the gradual water pollution events, the water quality assessment based on water quality index is adopted. The assessment of water quality is accomplished with both the single-factor index method and the comprehensive index method. Combining with the influenced range, duration and other factors of contaminants, the early-warning grade of water quality is obtained.2. To the emergent water pollution events, a water quality event indirect detection method is introduced, according with the research on the coherence of contaminants and the regular water paramenters, aiming at detecting abnormal water event indirectly based on regular on-line water quality data.3. Due to the particularity of water quality information and the possible safety issue coming from point-to-point message dissemination, data encryption algorithm is studied. Data encryption application of server-side and data decryption application of smart client-side (e.g. Symbian OS) are developed in order to improve the security of information dissemination.4. Automatic classification and security dissemination functions of water quality early-warning information are integrated on water quality monitoring and early-warning system. Besides the information management functions on the server platform, an integrated dissemination process including classification, data encryption, information generation, message dissemination, data decryption and message display are completely developed. The channel switching technology of information dissemination platform is also applied to improve the reliability of information dissemination.In general, automatic classification and security dissemination of early-warning information is an important link of urban water quality monitoring and early warning system. Main research results have already been put into practical application.