해수침투 모의를 위한 Visual Basic 기반 2차원 유한차분 밀도 결합 흐름 모델 개발 = Development of a Visual-Basic based Two-Dimensional Finite-Difference Density-Coupled Flow Numerical Code for Simulating Saltwater Intrusion

다국어 초록 (Multilingual Abstract)

The purpose of this study is to develop VDFT (Visual Basic based Density-coupled Flow and Transport), a numerical modeling code used to simulate density coupled flow equations used to simulate seawater intrusion in a two dimensional finite difference method. The VDFT code has the advantage of being intuitive and simple to use and has the advantage of utilizing the EXCEL Visual Basic platform,which is widely used for general business purposes. Generally, code developed for numerical simulation can be verified through representative example models called benchmark problem. In this study, we verified the VDFT code using benchmark problem called Henry Problem and Modified Henry Problem as well as two laboratory test data. The results of this study are analyzed the importance of each benchmark problems, validated VDFT code compared to those problems. In conclusion, the possibility of using VDFT code is diagnosed and the direction of future research is suggested.

국문 초록 (Abstract)

본 연구는 해수침투를 모의하는 연산의 바탕이 되는 밀도 결합 방정식을 2차원으로 유한차분한 VDFT (Visual Basic based Density-coupled Flow and Transport) 기법을 개발한 것이다. VDFT 코드는 직관적이고 간단하게 사용할 수 있다는 장점을 가지고 있으며 일반 업무용으로 널리 사용되고 있는 EXCEL Visual Basic 플랫폼을 활용할 수 있다는 장점이 있다. 일반적으로 수치모의를 위해 개발한 코드는 벤치마크 라는 대표적인 수치예제를 통하여 검증을 할 수 있다. 본 연구에서는 2가지 실내실험 결과로서 얻어진 데이터와 Henry Problem 및 Modified Henry Problem을 수치예제로 활용하여 VDFT 기법을 검증하였다. 마지막으로 결론에서는 VDFT 코드의 활용가능성을 진단하고 향후 연구의 방향성을 제시하였다.

참고문헌 (Reference)

1 Voss, C. I., "Variable Density Flow and Solute Transport Simulation of Regional Aquifers Containing a Narrow Freshwater-Saltwater Transition Zone" 23 (23): 1851-1866, 1987

2 Kanel, S. R., "Two Dimensional Transport Characteristics of Surface Stabilized Zero-Valent Iron Nanoparticles in Porous Media" 42 (42): 896-900, 2008

3 Simpson, M. J., "Theoretical Analysis of the Worthiness of Henry and Elder Problems as Benchmarks of Density-Dependent Groundwater Flow Models" 26 (26): 17-31, 2003

4 Croucher, A. E., "The Henry Problem for Saltwater Intrusion" 31 (31): 1809-1814, 1995

5 Frind, E. O., "Simulation of Long-Term Transient Density-Dependent Transport in Groundwater" 5 (5): 73-88, 1982

6 Huyakorn, P. S., "Saltwater Intrusion in Aquifers: Development and Testing of a Three-Dimensional Finite Element Model" 23 (23): 293-312, 1987

7 Lee, C. H., "On Seawater Encroachment in Coastal Aquifers" 10 : 1039-1043, 1974

8 Rohit R. Goswami, "Laboratory-scale investigation of saltwater intrusion dynamics" Wiley-Blackwell 43 (43): 2007

9 Simpson, M. J., "Improving the Worthiness of the Henry Problem as a Benchmark for Density-Dependent Groundwater Flow Models" 40 (40): W01504-, 2004

10 Guo, W., "Guide to SEWAT: A Computer Program for Simulation of Three-Dimensional Variable-Density Ground-Water Flow" United States Geological Survey 2002

11 Diersch, H. J. G., "FEFLOW finite element subsurface flow and transport simulation system-user's manual/reference manual/white papers"

12 Henry, H. R., "Effects of dispersion on salt encroachment in coastal aquifers" U.S. Geological Survey 1964

13 Chang, S., "Dynamics of saltwater intrusion processes in saturated porous media systems" Auburn University 2012

14 Goswami, R. R., "Comparison of Numerical Techniques used for Simulating Variable-Density Flow and Transport Experiments" 17 (17): 272-282, 2012

15 Segol, G., "Classic Groundwater Simulations Proving and Improving Numerical Models" Old Tappan 1994

16 Torlapati, J., "Benchmarking a Visual-Basic based Multi-Component One-Dimensional Reactive Transport Modeling Tool" 50 : 72-83, 2013

17 Pinder, G. F., "A Numerical Technique for Calculating the Transient Position of the Saltwater Front" 6 (6): 875-882, 1970

18 Voss, C. I., "A Model for Saturated-Unsaturated, Variable-Density Ground-Water Flow with Solute or Energy Transport Report" U.S. Geol. Surv. 2002

19 Segol, G., "A Galerkin-finite Element Technique for Calculating the Transient Position of the Saltwater Front" 11 (11): 343-347, 1975