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Optimal groundwater remediation design of a pump and treat system considering clean-up time
고낙열,이강근,현윤정 한국지질과학협의회 2005 Geosciences Journal Vol.9 No.1
This study presents the optimal groundwater remediation design using a pump and treat method by optimizing the clean-up time, which is a critical factor to determine an optimal remediation design in practical applications. In this study, a simulation-optimization approach was used to determine an optimal remediation design. For a simulation-optimization approach, MODFLOW and MT3D models were used for simulating groundwater flow and mass transport, and the genetic algorithm (GA) was applied for optimizing the number and locations of pumping wells for applications of the pump and treat methods. The optimal remediation design was determined by using two objective functions: minimizing the total pumping rate and total pumping volume with optimizing clean-up time, respectively. Results revealed that major pumping wells were mainly located on the centerline at down-gradient of regional flow regardless of the objective functions. However, the number and locations of optimal pumping wells varied with time and unnecessarily excessive pumping occurred when clean-up time was treated as a fixed constraint. Therefore, it is concluded that clean-up time must be optimized by considering it as a decision variable in order to design the optimal pump and treat system. The sensitivity analysis showed that there is an appropriate range of hydraulic conductivity for the practical and effective pump and treat remediation design. However, this sensitivity analysis is very limited and model-specific. Thus, the sensitivity of a remediation design to other hydraulic parameters, boundary and initial conditions, and contaminant concentrations should be further investigated.
Design of effective remediation system in a contaminated aquifer by controlling constraints
고낙열,이강근 한국지질과학협의회 2009 Geosciences Journal Vol.13 No.4
Optimization of groundwater remediation design using the pump and treat method was modeled under controlled concentration constraint conditions. The remediation design in a contaminated aquifer with a heterogeneous hydraulic conductivity field was optimized by simultaneously minimizing the number of extraction wells and total extraction volume. A simulation–optimization method was applied to search for optimal designs. When the contaminant concentration constraint intensified, both the extraction volume and number of extraction wells generally increased. However, the number of wells, well locations, and extraction volume did not increase regularly according to changes in the constraint condition. These variations imply that remediation cost should be optimized by adjusting constraint conditions. Under the intensified constraints, the cleanup time changed ahead of the increase of the extraction rates, and the removal efficiency of contaminant decreased. It shows that a cost-effective remediation strategy using the pump and treat method could be achieved by increasing the cleanup time rather than extraction rates or introducing additional remediation techniques.
단열대의 영향을 고려한 블록 규모 단열 암반에서의 지하수 유동 모의
고낙열,지성훈,고용권,최종원,Ko, Nak-Youl,Ji, Sung-Hoon,Koh, Yong-Kwon,Choi, Jon-Won 한국방사성폐기물학회 2010 방사성폐기물학회지 Vol.8 No.2
The block-scale groundwater flow system at Olkiluoto site in Finland was simulated. The heterogeneous and anisotropic hydraulic conductivity field for the domain was constructed from the discrete fracture network, which considered only the fractured zones identified in the deep boreholes installed in the study site. The groundwater flow model was calibrated by adjusting the recharge rate and the transmissivities of the fractured zones to fit the calculated hydraulic heads and into- and out-flow rates in the observation intervals of the boreholes with the observed ones. In the calibrated model, the calculated flow rates at some intervals were not in accordance with the observed ones although the calculated hydraulic heads fit well with the observed ones, which revealed that the number of the conduits for groundwater flow is insufficient in the conceptual model for groundwater flow modeling. Therefore, it was recommended that the potential local conduits such as background fractures should be added to the present conceptual model.
지하수 유동 특성을 이용한 심층처분의 처분공 배치 방안
고낙열,백민훈 한국방사성폐기물학회 2016 방사성폐기물학회지 Vol.14 No.4
Based on the results of groundwater flow system modeling for a hypothetical deep geological repository site, quantitative and spatial distributions of groundwater flow rates at the positions of deposition holes, groundwater travel length and time from the positions to the surface environment were analyzed and used to suggest a method for determining locations of deposition holes. The hydraulic head values at the depth of the deposition holes and a particle tracking method were used to calculate the groundwater flow rates and groundwater travel length and time, respectively. From the results, an approach to designing a layout of deposition holes was suggested by selecting relatively favorable positions for maintaining performance of the disposal facility and screening some positions of deposition holes that did not comply with specific constraints for the groundwater flow rates, travel length and time. In addition, a method for determining a geometrical direction for extension of the disposal facility was discussed. Designing the layout of deposition holes with the information of groundwater flow at the disposal depth can contribute to secure performance and safety of the disposal facility. 가상의 심층처분 부지의 지하수 유동 모의 결과를 통해 처분 심도에 위치하는 처분공 지점에서의 지하수 유동량 및 해당 지점에서 지표 환경까지 지하수가 유동하는 경로의 거리와 경로를 통과하는데 걸리는 시간에 대한 수량적, 공간적 분포를 분석하여 그 결과를 처분공의 위치 결정에 이용할 수 있는 방안을 제시하였다. 지하수 유동량은 처분공 위치에서 계산된 지하수위를, 유동 거리와 경과 시간은 입자 추적 기법(particle tracking)을 이용하여 계산하였다. 지하수 유동량 및 유동 거리와경과 시간의 공간적 분포를 이용하여 처분시설의 성능을 유지하는데 상대적으로 유리한 위치를 선별하고 특정한 제한 조건이 주어진 경우 제외되어야 하는 처분공 위치를 결정하여 처분공 배치에 이용할 수 있은 방안을 제시하였다. 또한 세 가지정보를 함께 고려하여, 추가적인 처분공의 위치를 선정할 필요가 있을 경우 보다 유리한 확장 방향을 제시할 수 있는 방안도논의되었다. 처분 심도에서의 지하수 유동 정보를 활용하여 처분공의 배치 방안을 결정하는 것은 처분시설의 성능 및 안전성 확보를 위해 기여할 수 있을 것으로 생각된다.