An integrated GIS-based pumping-injection control system developed for preventing the spread of NAPL contaminants in a groundwater system

The objectives of this study are to develop an integrated GIS-based pumping-injection operation system that can hydraulically control the spread of groundwater contaminants and contaminant plumes and to suggest the optimized operation condition that can prevent the spreading of contaminant plume with a hydraulic flow control concept in a short period. Since there are no cases of simultaneously implementing the numerical modeling for groundwater flow and contaminant transport in groundwater monitoring or management systems at contaminated sites, the system developed through this project is an integrated operation system that can implement the numerical modeling of both groundwater flow and contaminant transport on the web and can suggest optimal remediation factors using Simulation-Optimization method. Among various studies associated with groundwater remediation at NAPL contaminated sites, this study performs to suggest cost-effective remediation factors using a simulation-optimization model that takes into account the hydrogeological factors of the contaminated site when performing remedial action by the pumping-injection method. The Genetic Algorithm(GA) code was used for the development of the optimal remediation design algorithm for the pumping-injection system. The developed optimization algorithm was verified through the simplified numerical model simulation considering random contaminant sources. And then this algorithm was applied to actual DNAPL contaminated site. The developed integrated operating system was able to smoothly perform the model for groundwater flow and contaminant transport on the web. In addition, the optimization model related to remedial action operation was well linked to the web operating system to derive optimal operating factors. This work was supported by Korea Environment Industry &Technology Institute (KEITI) through "Activation of remediation technologies by application of multiple tracing techniques for remediation of groundwater in fractured rocks"(Grantnumber:20210024800002/1485017890), "Hydraulic control and containment using pumping-injection system" (SEM projects 2020002470001/1485017133) by the Korea Ministry of Environment(MOE)" and Korea Environment Industry & Technology Institute(KEITI) through the Demand Responsive Water Supply Service Program (RE20191097) funded by the Korea Ministry of Environment (MOE).