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Document Type |
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Article In Conference |
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Document Title |
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Simulation of dispersion in a heterogeneous aquifer: discussion of steady محاكاة التشتت في طبقة المياه الجوفية غير المتجانسة : مناقشة ثابت مقابل متقلب تدفق المياه الجوفية وتحليل أوجه عدم التيقن |
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Document Language |
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English |
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Abstract |
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Simulation of dispersion in a heterogeneous aquifer: discussion of steady versus unsteady groundwater flow and an uncertainty analysis
G.J.M. Uffink, A.M.M. Elfeki & S. Lebreton
Delft University of Technology, Delft, The Netherlands.
ABSTRACT: A random walk particle method has been used to simulate the dispersion process of a highly heterogeneous aquifer at Columbus Air Force Base in Mississippi, USA (MADE 1). The simulation addresses two aspects: (1) comparison of steady and unsteady groundwater flow and the effect on plume spreading, and (2) analysis of the effects of uncertainty on the hydraulic conductivity map on simulation results. Simulation of the MADE1 experiment shows that small variations in the gradient have no significant impact on the aquifer response and transport of solutes. However, temporal variations in the magnitude of the gradient coupled with aquifer heterogeneity do account for a substantial part of the lateral spreading of the plume. Poor agreement between the simulations and the MADE1 results can certainly be attributed to the aquifer characterisation. The distributions of the hydraulic conductivity were estimated at a very coarse scale. The depth-averaged maps and the kriged map at elevation of 59m did not enable an accurate simulation because of the lack of data about fine-scale heterogeneity. This may explain why the simulated solute is small compared to the spreading observed in the field. |
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Conference Name |
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International Symposium on Stochastic Hydraulics, Eds. Vrijling, J.K., Rurijgh, E., Stalenberg, B. Van Gelder, P.H.A.I.M., Verlaan, M., Zijderveld, A. |
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Publishing Year |
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1426 AH
2005 AD |
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Article Type |
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Article |
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Added Date |
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Tuesday, March 6, 2012 |
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Researchers
| عمرو محمد الفقي | Elfeki, Amro Mohamed | Investigator | Doctorate | aelfeki@kau.edu.sa |
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