Development On Decision Support System For Groundwater Remediation Of Contaminated Sites Based On GIS

Over the years,with the rapid development of Chinese's economy,the quality of groundwater has been reduced due to human activities,and the problem of groundwater pollution from point and non-point sources has become more and more prominent,so it is imperative to control and remediate groundwater pollution.Many different remediation technologies have been proposed for the remediation of groundwater pollution in contaminated sites.For Decision-making and management of site pollution remediation,it is necessary to comprehensively consider the relevant aspects of pollution remediation,including manpower and material resources,time cost,technical operability,site reuse and residual risks.In view of specific contaminated sites,the hydrogeological conditions and groundwater pollution conditions are characterized by zoning,and the key to realize efficient treatment of contaminated sites is to select the best remediation technology for different zoning.In this paper,the groundwater remediation zoning method of contaminated sites was studied in combination with typical contaminated sites,and a decision support system based on GIS was developed for groundwater remediation of contaminated sites.Furthermore,the optimal technology selection of groundwater remediation of contaminated sites was completed under the premise of comprehensive consideration of multiple influencing factors of site remediation.The main research results are as follows:(1)The database structure of groundwater remediation related information of contaminated sites has been createdThrough site investigation,collection and laboratory test,the characteristics,types of pollutants and related index parameters of the contaminated site were obtained.A SQL Server database was created according to the remediation requirements of the contaminated site,and multiple attribute sheets were established in the database to record the use conditions,remediation duration,remediation cost and other information of various remediation technologies in detail.(2)Determine the appropriate method to complete the spatial interpolation of contaminated sites according to different number of monitoring pointsAccording to the numerical simulation analysis and the results of field survey,typical for monitoring points,analysis of IDW,kriging,spline function and so on a variety of spatial interpolation method based on GIS in groundwater pollution plume and the degree of precision partition characterization,analysis is also given under different spatial interpolation methods in the given space sampling point number corresponding to the appropriate interpolation method.(3)The zoning basis and specific zoning method for groundwater zoning remediation of contaminated sites are put forwardConsidering the complexity of the contaminated site conditions,the idea of groundwater zoning remediation was put forward from the aspects of permeability coefficient,pollutant concentration,pollutant type and burial depth,etc.,and three zoning processing methods of mixed pixels were proposed by using spatial data-grid data value rules.Finally,the goal of more targeted and more efficient pollutant remediation is achieved.(4)Developed a GIS-based decision support system for groundwater zoning remediation of contaminated sitesHighlight the goal of highly efficient area groundwater pollution partition repair,in establishing parameter database and on the basis of optimization algorithm,using Visual studio as the development platform,c # as development language,SQL as a database creation language,finally combining Arc Engine for secondary development.Considering the repair time,repair effect,residual risk,repair costs,technology field,a GIS based decision support system software for high efficiency groundwater comprehensive remediation is developed.Finally,the optimization and screening of groundwater remediation technology in contaminated sites are realized through the application of typical cases,and the effectiveness and practicability of zoning remediation method and decision support system are confirmed.There are 39 figures,9 tables and 86 references in this paper.