scholarly journals Riverbank Filtration for the Water Supply on the Nakdong River, South Korea

Water ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 129 ◽  
Author(s):  
Sung Maeng ◽  
Kyung-Hyuk Lee
Keyword(s):  
Organic Matter ◽  
South Korea ◽  
Field Study ◽  
Oxygen Demand ◽  
Riverbank Filtration ◽  
Vertical Wells ◽  
Nakdong River ◽  
Production Wells ◽  
Pumping Rates ◽  
The Nakdong River

A field study was carried out to investigate the feasibility of a riverbank filtration site using two vertical wells on the Nakdong River, South Korea. The riverbank filtration site was designed to have eleven horizontal collector wells in order to supply 280,000 m3/day. This field study provided more insight into the fate of the dissolved organic matter’s characteristics during soil passage. The vertical production wells (PWs) were located in different aquifer materials (PW-Sand and PW-Gravel) in order to determine the depth of the laterals for the horizontal collector wells. The turbidity of the riverbank filtrates from the PW-Sand (0.9 NTU) and PW-Gravel (0.7 NTU) was less than 1 NTU, which was the target turbidity of the riverbank filtrate in this study. The iron concentrations were 18.1 ± 0.8 and 25.9 ± 1.3 mg/L for PW-Sand and PW-Gravel respectively, and were higher than those of the land-side groundwater. The biodegradable organic matter-determined biochemical oxygen demand in the river water was reduced by more than 40% during soil passage, indicating that less microbial growth in the riverbank filtrate could be possible. Moreover, the influence of the pumping rates of the vertical wells on the removal of dissolved organic matter and the turbidity was not significant.

scholarly journals Lithologic Control of the Hydrochemistry of a Point-Bar Alluvial Aquifer at the Low Reach of the Nakdong River, South Korea: Implications for the Evaluation of Riverbank Filtration Potential

Water ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1763 ◽  
Author(s):  
Md Moniruzzaman ◽  
Jeong-Ho Lee ◽  
Kyung Jung ◽  
Jang Kwon ◽  
Kyoung-Ho Kim ◽  
...  
Keyword(s):  
South Korea ◽  
River Water ◽  
Large Scale ◽  
Alluvial Aquifer ◽  
Riverbank Filtration ◽  
Nakdong River ◽  
Point Bar ◽  
Site Assessment ◽  
The Nakdong River ◽  
Upper Aquifer

To assess the groundwater−river water interaction in a point-bar alluvial aquifer as a crucial step in site assessment for riverbank filtration, hydrochemical and hydrogeologic investigations were performed on a riverine island at the low reach of the Nakdong River, South Korea. The site was evaluated for the application of large-scale bank filtration. Unconsolidated sediments (~40 m thick) of the island comprise fine- to medium-grained sand (upper aquifer), silty sand with clay intercalations, and sandy gravel (lower aquifer) in descending order. The intermediate layer represents an impermeable aquitard and extends below the river bottom. A total of 66 water samples were collected for this study; groundwater (n = 57) was sampled from both preexisting irrigation wells, and three multi-level monitoring wells (each 35 m deep). Groundwater chemistry is highly variable, but it shows a distinct hydrochemical change with depth: shallow groundwater (<25 m deep) from the upper aquifer is characteristically enriched in NO3− and SO42−, due to agricultural contamination from the land surface, while deeper groundwater (>25 m deep) from the lower aquifer is generally free of NO3− and relatively rich in F. The lower aquifer groundwater is also higher in pH, and concentrations of K+, Mg2+, and HCO3−, indicating that the aquifer is likely fed by regional groundwater flow. Such separation of groundwater into two water bodies is the result of the existence of an impermeable layer at intermediate depth. In addition, the hyporheic flow of river water is locally recognized at the upstream part of the upper aquifer as the zone of low TDS (Total Dissolved Solids) values (<200 mg/L). This study shows that the study site does not seem to be promising for large-scale riverbank filtration because 1) the productive, lower aquifer is not directly connected to the bottom of the river channel, and 2) the upper aquifer is severely influenced by agricultural contamination. This study implies that the subsurface hydrogeologic environment should be carefully investigated for site assessment for riverbank filtration, which can be aided by a detailed survey of groundwater chemistry.

scholarly journals Relationship between Coliform Bacteria and Water Quality Factors at Weir Stations in the Nakdong River, South Korea

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1171 ◽  
Author(s):  
Mijin Seo ◽  
Haejin Lee ◽  
Yongseok Kim
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
South Korea ◽  
Influential Factor ◽  
Fecal Coliforms ◽  
Coliform Bacteria ◽  
Quality Factors ◽  
Nakdong River ◽  
Study Results ◽  
The Nakdong River

Artificial structures installed in rivers can change the natural physical, physiochemical, and biological characteristics of the rivers. Coliform bacteria are important water quality indicators, related to human health. This study investigated the relationship between coliform bacteria and water quality factors at eight weir stations constructed in the Nakdong River, a major river in South Korea. Fifteen water quality factors were analyzed at these sites from 2012 to 2016 using correlation and multiple regression analyses. The results for all stations confirmed the analytical validity, with high adjusted R2 values of approximately 0.6 and 0.8 on average for total and fecal coliforms, respectively. The results showed influential water quality factors affecting the concentration of coliform bacteria at weir stations. Specifically, total coliforms were mostly affected by organic matter and fecal coliforms were mostly affected by phosphate phosphorus and suspended solids. Rainfall was the most influential factor affecting both coliforms. Further, both coliforms were negatively affected by organic matter below the Dalseong weir in the mid- to downstream area of the Nakdong River. A positive relationship with phosphate phosphorus was indicated at all weir stations. To the authors’ knowledge, this kind of study has never been attempted so far. Thus, the study results can provide important information on influential water quality factors related to coliform bacteria, especially in the Nakdong River, creating a foundation for future water quality management.

scholarly journals Sedimentary Processes of Barrier-Lagoon System in the Nakdong River Estuary, Busan, South Korea

2018 ◽  
Vol 85 ◽  
pp. 1-5 ◽  
Author(s):  
Han Jun Woo ◽  
Jun-Ho Lee ◽  
Jeongwon Kang ◽  
Jae Ung Choi
Keyword(s):  
South Korea ◽  
River Estuary ◽  
Nakdong River ◽  
Sedimentary Processes ◽  
Lagoon System ◽  
The Nakdong River
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