Research On GIS-based Sewage Pipeline Monitoring And Maintenance Decision Support System

Various environmental factors will lead to degradation of sewage pipeline performance, and will shorten the normal life of sewage pipeline, and will cause structural damage and functional damage of sewage pipeline. The paper researches combination of sewage pipeline inspection and maintenance decision and GIS technology, and studies monitoring health conditions of sewage pipeline network, which can supply decision support to optimal maintenance of sewage pipeline, and can improve the standard of management and maintenance of sewage pipeline. The research has expanded the application fields of GIS.This paper studies the effect of corrosive medium in domestic sewage on concrete pipeline, and presents corrosion model and failure probability calculation model of pipeline structure. According to damaged possibility and environment influences result of actual sewage pipeline, this paper establishes sewage predictive health assessment indicators system, and bring forward grey relation integrated assessment model of sewage pipeline predictive health degree based on grey theory. An inspection order of priority is confirmed by predictive health degree. The paper establishes sewage actual health assessment indicators system according to factual pipes damage data and environment influences result of sewage, and bring forward attribute synthetic assessment model of sewage actual health degree based on attribute theory. The maintenance order of priority is confirmed by actual synthetic health degree of assessment result. On the basis of economic analysis of sewage pipeline inspection and maintenance technology, through researching inspection and maintenance cost function of sewage pipeline, this paper establishes optimal maintenance decision model, which can select maintenance strategy based on the integrated optimal target of economic, environmental and social benefits. GIS is applied to sewage pipeline Inspection and maintenance decision system. VB and ActiveX components is adopted in this research. SuperMap Objects is selected as the development platform, and then this paper developes a GIS-based sewage pipeline monitoring and maintenance decision support system (PMMDSS) software, which has not only conventional information management functions of sewage pipeline network, but also has monitoring and maintenance decision-making function, and can accomplish failure probability calculation, sewage predictive health assessment, sewage actual health assessment, optimal maintenance decision, and has quick visual attributes and spatial query and analysis functions.To test the program, sewage pipeline at new eastern district in Yuechi county, Sichuan province, is selected as the example, sewage pipeline monitoring and maintenance optimal decision is carried out. Through analyzing assessment result and decision result, this paper draw a conclusion: predictive health synthetic assessment model, actual health synthetic assessment and optimal maintenance decision model are effective. PMMDSS can supplies quick visual decision support for sewage pipeline network, can monitor sewage pipeline dynamically, and can provide decision support for credible, safe operation of sewage pipeline, can have obvious economic, environmental and social benefits.