Estimating hydraulic conductivity using grain-size analyses, aquifer tests, and numerical modeling in a riverside alluvial system in South Korea |
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| Authors: | Jae-Yeol Cheong Se-Yeong Hamm Hyoung-Soo Kim Eun-Joung Ko Kyounghee Yang Jeong-Hwan Lee |
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| Institution: | (1) Division of Earth Environmental System, Pusan National University, San 30, Jangjeon-Dong, Geumjeong-Gu, Busan, 609-735, South Korea;(2) Korea Institute of Water and Environment, Korea Water Resources Corporation, 462–1 Jeonmin-Dong, Yuseong-Gu, Daejeon, 305-730, South Korea |
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| Abstract: | Hydraulic conductivity (K) for an alluvial system in a riverbank filtration area in Changwon City, South Korea, has been studied using grain-size distribution, pumping and slug tests, and numerical modeling. The alluvial system is composed of layers: upper fine sand, medium sand, lower fine sand, and a highly conductive sand/gravel layer at the base. The geometric mean of K for the sand/gravel layer (9.89?×?10?4 m s?1), as determined by grain-size analyses, was 3.33 times greater than the geometric mean obtained from pumping tests (2.97?×?10?4 m s?1). The geometric mean of K estimates obtained from slug tests (3.08?×?10?6 m s?1) was one to two orders of magnitude lower than that from pumping tests and grain-size analyses. K estimates derived from a numerical model were compared to those derived from the grain-size methods, slug tests and pumping tests in order to determine the degree of deviation from the numerical model. It is considered that the K estimates determined by the slug tests resemble the uppermost part of the alluvial deposit, whereas the K estimates obtained by grain-size analyses and pumping tests are similar to those from the numerical model for the sand/gravel layer of the riverside alluvial system. |
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| Keywords: | Grain-size analysis Hydraulic conductivity Numerical modeling Riverbank filtration South Korea |
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