Evaluation of the processes affecting vertical water chemistry in an alluvial aquifer of Mankyeong Watershed, Korea, using multivariate statistical analyses |
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| Authors: | Byoung-Young Choi Hyeon-Jung Kim Kangjoo Kim Seok-Hwi Kim Hwa-Jin Jeong Eungyu Park Seong-Taek Yun |
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| Institution: | (1) School of Civil and Environmental Engineering, Kunsan National University, Jeonbuk, 573-701, South Korea;(2) Department of Geology, Kyungpook National University, Daegu, 702-701, South Korea;(3) Department of Earth and Environmental Sciences, Korea University, Seoul, 136-701, Korea |
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| Abstract: | Vertical variations of redox chemistry and groundwater quality were investigated in an alluvial aquifer beneath an agricultural
area, in which deep groundwaters are free of NO3, Fe, and Mn problems that are frequently encountered during the development of alluvial groundwaters. This study was performed
to identify and evaluate vertical chemical processes attenuating these chemical species in the study area. For this study,
the processes affecting groundwater chemistry were identified by factor analysis (FA) and the groundwater samples collected
from six multilevel samplers were hierarchically classified into three different redox zones by cluster analysis (CA) based
on the similarity of geochemical features. FA results indicated three major factors affecting the overall water chemistry:
agricultural activities (factor 1), redox reactions (factor 2), and remnant seawater (factor 3). The groundwater quality in
the study area was revealed to be controlled by a series of different redox reactions, resulting in different redox zones
as a function of depth. It was also revealed that the low Fe and Mn levels in the groundwater of the deeper part are associated
with sulfate reduction, which led to precipitation of Fe as iron sulfide and adsorption of Mn on it. |
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| Keywords: | Alluvial groundwater Redox reaction Factor analysis Cluster analysis Mankyeong watershed |
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