Application Of GIS In River Pollution Accident

In recent years,accidents of river pollution especially those paroxysmal ones occurred with the characteristic of high frequency,huge ruins and uncertain causation,which are known to be potentially harmful to human or ecosystem health at very low trace levels . At the present time,people have explored to deal with the emergency of river pollution by dint of introducing the function of spatial database management and the function of spatial analysis of Geographic Information System (GIS) technologies,which work effective. However,traditional GIS technologies are inadequacy as far as application in meeting an emergency of river pollution is concerned . It is significative for emergency management to explore and utilize GIS technologies on the base of traditional usage,and to make it more effective,practical and systemic.This paper starts with the basis function and characteristic of GIS technologies,then represents its application and advantages in water environment field in details.By taking examples of Hengyang segment of Xiang River and Three Gorges Reservoir Area ,the operation and methods of GIS technologies in the application of paroxysmal accidents of river pollution and simulation of Two-dimensional stochastic water quality are respectively analyzed,and some measures to settle existing problems are offered.In the example of treating with accidental pollution of rivers with GIS technologies in Hengyang segment , the emergency settlement of river pollution caused by Arsenic (As) ,which is a kind of heavy metal are emphasized.Through combined analysis of GIS technologies together with mathematics model ,the pollution statement and diffuse tendency of heavy metal in polluted river are discovered,and the resolvent which is find out through analysing the four pullution statement classified depend on the different effect on accidents are also offered.In the example of dealing with the simulation of Two-dimensional stochastic water quality in Three Gorges Reservoir Area established based on Dynamic Grid technology of GIS,definition and methods of application of Dynamic Grid are elaborated on,and its practices in the simulation of Two-dimensional stochastic water quality are also offered,which is proved available for the analysis and forecast of water quality .And at last take Chongqing segment as an example,simulant photographs of pollution are illustrated .