Analysis of urban water quality based on GIS

With the acceleration of urbanization, the phenomenon of urban drinking water pollution is quite obvious. According to China Environmental State Bulletin, the national surface water quality in general is moderately polluted in 2006. In the National Environmental Monitoring Network, the actual monitoring sections of the 745 surface water monitoring sections (the river sections 593, lake and reservoir point positions 152), I ~ III class, IV, V class, inferior class V cross-section of the water quality of the respective ratios is 40%, 32% and 28% The major pollution indicators are permanganate index, ammonia nitrogen and oil and so on. While developed countries have reached the international advanced level in drinking water quality standards, issued a series of laws and regulations to improve water quality, planning programs, and has taken a number of the corresponding technical support measures, but in water quality information management and monitoring of early warning still remains more problems. From the quality of drinking water collection, transmission, conversion to store, manage, display, analysis and early warning, we can draw a series of research results to provide a method to effectively solve the water quality control early-warning data upload is not timely, large error, management difficulties, the expression single issues such as the lack of analytical tools, and construct a set of water quality from source to faucet monitoring system, the formation of urban drinking water quality management, analysis, monitoring, early warning and related technology research and development integrated platform for experts providers, governments at all levels of scientific decision making and timely day to day management of technical support to the Chief. Based on water quality monitoring network and a distributed, network-based, multi-source water quality information collection technology, transmission technology, processing technology, visualization technology, GIS tech- - nology to conduct scientific research and technology integration, the establishment of national water quality management information on spatio-temporal database and the establishment of national water information management system and visualization platform, lead from a source to monitor the water quality of the whole process to achieve from the central to local full-coverage graded water quality management, water quality at all levels, departments in charge of water supply units in the daily drinking water quality management, scientific decision-making and to provide technical support for emergency warning.