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Hazard Zone Detemination of Water Pollution and the Prototype System Development

Author: JiangJiPing
Tutor: WangPeng
School: Harbin Institute of Technology
Course: Environmental Science and Engineering
Keywords: Sudden water pollution Determining Dangerous Zones Spatial interpolation Raster Analysis Geographic Information Systems
CLC: X52
Type: Master's thesis
Year: 2008
Downloads: 80
Quote: 2
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Abstract

China's industrialization and urbanization are accelerating environmental pollution incidents, especially water pollution emergencies frequent outbreaks, caused great harm to society. On a technical level, it is urgent to establish and improve the environmental pollution emergency warning systems to deal with such man-made disasters. Sudden water pollution warning system, the environmental risk assessment is an important theoretical basis and technical support for one, but it focuses mainly on prior probabilistic risk assessment, and real-time evaluation of the consequences of the water pollution accident during the relatively few studies , is usually only given in the accident during the migration trajectory and concentration distribution of real-time toxic substances, without taking into account other conditions are consistent pollutant concentrations and the risk is not necessarily a linear relationship, the same chemical concentrations for different subject The body of the dangers of many complex factors. Therefore can not meet the demand on the pollution accident real-time dynamic assessment and real-time warning. In order to consider the dangers of difference, to improve the real-time dynamic assessment theory, this paper established to determine the mode of water pollution danger zone and its conceptual system, and focus on the sudden water pollution Determining the dangerous zone. Analysis of the similarities and differences between the theory and Natural Disasters in hazardous area determination and probabilistic risk assessment in risk zoning concept. Can apply the theory to the early warning of sudden water pollution emergency, accident of real-time dynamic early warning and emergency decision-making can also be used in the normal management of the water environment. For practical application, consider the practicality and ease of operation, this paper, sudden water pollution simplified decision model, described with mathematical functions and space operations, and other relevant theories are compared and analyzed. Then explore the simplified model is based on the implementation of GIS and visual way. And based on spatial interpolation and raster analysis to solve the problem of mapping from the concentration field to the dangerous field. Order to ensure the the hydraulic water quality model for solving the accuracy of the results fall into the third-party GIS system to generate concentration field unit basis function interpolation in the class of spatial interpolation and finite element method analysis, cross-validation and gray visual comparative analysis , as long as the mesh is dense enough, parameter setting reasonable both of interpolation accuracy on consistent conclusions to ensure the accuracy of the determination of the danger zone. According to the results of the study, based on GIS and database technology, the use of SuperMap Object secondary development component, Visual Basic 6.0 programming language developed sudden water pollution danger zone to determine the prototype system, Determining Dangerous Zones on the computer. The prototype system has a basic map operation, three-dimensional scene browsing, model calls, automatic conversion of data format, the concentration field generation and dangerous field to generate a variety of functions, such as to constitute a complete application system. Based on the Songhua River, Songhua River nitrobenzene pollution event in 2005 as the background, to do a specific application analysis, the successful completion of the danger zone determination, and has been the strong performance of the early warning Figure, to obtain good results. If the prototype system is integrated into the package of basin water pollution warning system, will play the role of powerful decision support for emergency management.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control
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