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- 저자 : 정일문 ( Il Moon Chung ) (검색결과 128 건)
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고유치 수치기법을 이용한 지하저장공동 주위의 용질이동해석
정일문 ( Il Moon Chung ),김지태 ( Ji Tae Kim ),조원철 ( Won Cheol Cho ),김남원 ( Nam Won Kim ) 대한지질공학회 2008 지질공학 Vol.18 No.4
The eigenvalue technique is introduced to overcome the problem of truncation errors caused by temporal discretization of numerical analysis. The eigenvalue technique is different from simulation in that only the space is discretized. The spatially discretized equation is diagonized and the linear dynamic system is then decoupled. The time integration can be done independently and continuously for any nodal point at any time. The results of eigenvalue technique are compared with the exact solution and FEM numerical solution. The eigenvalue technique is more efficient than the FEM to the computation time and the computer storage in the same conditions. This technique is applied to the solute transport analysis in nonuniform flow fields around underground storage caverns. This method can be very useful for time consuming simulations. So, a sensitivity analysis is carried out by using this method to analyze the safety of caverns from nearly located contaminant sources. According to the simulations, the reaching time from source to the nearest cavern may takes 50 years with longitudinal dispersivity of 50 m and transversal dispersivity of 5 m, respectively.
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비선형 회귀모형을 이용한 지하저장공동 주변 현장수리지질시험 매개변수의 자동 추정
정일문 ( Il Moon Chung ),조원철 ( Won Cheol Cho ),김남원 ( Nam Won Kim ) 대한지질공학회 2008 지질공학 Vol.18 No.4
For the design and effective management of underground storage caverns, preliminary investigation on the hydrogeologic parameters around caverns and analysis on the groundwater flow must be carried out. The data collection is very imporatnat task for the hydrogeologic design so various hydraulic tests have been performed. When analyzing the injection/fall off test data, existing graphical method to estimate the parameters in Theis` equation is widely used. However this method has some sources of error when estimating parameters by means of human faults. Therefore the method of estimating parameters by means of statistical methods such as regression type is evaluated as a useful tool. In this study, nonlinear regression analysis for the Theis` equation is suggested and applied to the estimation of parameters for the real field interference data around underground storage caverns. Damping parameter which reduce the iteration numbers and inhance the convergence is also introduced.
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유역 수문모형과 저수지 추적기법을 연계한 샌드댐 저류량 산정
정일문 ( Il-moon Chung ),이정우 ( Jeongwoo Lee ),이정은 ( Jeong Eun Lee ),최정렬 ( Jung-ryel Choi ) 대한지질공학회 2018 지질공학 Vol.28 No.4
The implementation of drought measures in the upstream areas of river basins is seldom considered with respect to water supply. However, the demand for such measures is increasing rapidly owing to the occurrence of severe droughts, and interventions on streams and the water supply are needed. Physical interventions are an option to prevent streams from becoming dry and to maintain stream water flow, but dam construction is challenging because of environmental and ecological considerations. Here, a feasibility study was conducted to assess the potential effects of sand dams, which are widely used in arid regions in Africa. The SWAT-K model, which is a hydrologic model used for Korean watersheds, is used to estimate the flow rate of water in an ungauged watershed. The changes in water storage of the sand-dammed reservoir and in downstream flow rates are estimated for two types of sand dam (natural and dredged). The results show that sand dams are capable of increasing the downstream flow rate during normal conditions and of mitigating water supply problems caused by the withdrawal of water during drought periods.
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