Path Dependence of Four River Restoration Project and the Dilemma of Releasing Dammed Pools in the Nakdong River

2021 ◽  
Vol 25 (3) ◽  
pp. 245-268
Author(s):  
Chang Soo Kim
Keyword(s):  
River Restoration ◽  
Path Dependence ◽  
Nakdong River ◽  
Restoration Project ◽  
The Nakdong River

A case study of regional risk assessment of river restoration projects: Nakdong River Basin, South Korea

2015 ◽  
Vol 6 (3) ◽  
pp. 628-637 ◽  
Author(s):  
Jong-Suk Kim ◽  
Sun-Kwon Yoon ◽  
Minha Choi ◽  
Young-Il Moon
Keyword(s):  
Climate Change ◽  
Risk Assessment ◽  
South Korea ◽  
River Basin ◽  
River Restoration ◽  
Climate Change Scenarios ◽  
Nakdong River ◽  
Restoration Project ◽  
Nakdong River Basin ◽  
The Nakdong River

An integrated approach to risk assessment that can pose significant challenges to mitigation and adaptation at the local or regional levels in the context of climate change was developed. First, a conceptual framework for flood risk analysis was developed based on the hydrologic hazard and the socioeconomic vulnerability of a region. Second, weighting factors for each indicator were estimated using the modified Delphi approach based on the results of a survey of an expert group. Third, geographic information system analysis described the hydrologic risk at the regional level before and after completion of the Four Major Rivers Restoration Project at the Nakdong River Basin, South Korea. Finally, sensitivity analysis was conducted to evaluate the extent of the resilience of the Nakdong River Basin based on climate change scenarios to extend the existing research. It was found that the effect of the river restoration project in the future would be insignificant in terms of risk control over regions where floods are likely to increase upon climate change. We believe that this study provides useful information for the development of scientific, effective risk management tools for consistent application in a time of changing climate.

Feeding Habits of Larval Acanthogobius flavimanus from the Nakdong River Estuary, Korea

2019 ◽  
Vol 31 (3) ◽  
pp. 150-158
Author(s):  
Hee Chan Choi ◽  
Jeong Hyun Cho ◽  
Sung Hoi Huh ◽  
Joo Myun Park
Keyword(s):  
Feeding Habits ◽  
River Estuary ◽  
Nakdong River ◽  
Acanthogobius Flavimanus ◽  
The Nakdong River

Water Quality Aspects of the Nakdong Estuary Barrage

1984 ◽  
Vol 16 (1-2) ◽  
pp. 243-252 ◽  
Author(s):  
J W van Sluis ◽  
L Lijklema
Keyword(s):  
Water Quality ◽  
Water Quality Management ◽  
Sewage Treatment ◽  
Large River ◽  
Model Verification ◽  
Nakdong River ◽  
Treated Effluent ◽  
Quality Aspects ◽  
The Nakdong River ◽  
Few Data

As a result of the construction of a barrage in the estuary of the Nakdong river the size of the estuary will be considerably reduced. In addition, a large river reservoir is created upstream of the barrage. Main points of interest are the effects of the discharge of raw sewage and treated effluent into the Nakdong river on the water quality in the projected reservoir and the water quality forecasts for the remaining part of the estuary, in relation with the existing plans for sewerage and sewage treatment for the city of Busan. In addition, measures to reduce the effects of the barrage and the outline of a water quality management programme are presented. Special consideration is given to the methodological aspects of the water quality study, i.e. the selection and use of mathematical models in a situation where input data are rather uncertain and only very few data for parameter estimation and model verification are available.

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

scholarly journals Response of epilithic diatom assemblages to weir construction on the Nakdong River, Republic of Korea

2021 ◽  
Vol 126 ◽  
pp. 107711
Author(s):  
Kyung-Lak Lee ◽  
Jae Sin Choi ◽  
Jae-Hak Lee ◽  
Kang-Young Jung ◽  
Han Soon Kim
Keyword(s):  
Republic Of Korea ◽  
Diatom Assemblages ◽  
Nakdong River ◽  
The Nakdong River ◽  
Epilithic Diatom

scholarly journals An Assessment of Heavy Metal Contamination in the Nakdong River Around the Weir

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 684
Author(s):  
Hee Won Son ◽  
Sun Hee Shim ◽  
Haeseong Oh ◽  
Jung Hyun Choi
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Environmental Protection Agency ◽  
Heavy Metal Contamination ◽  
Environmental Research ◽  
Residual Fraction ◽  
Nakdong River ◽  
Risk Assessment Code ◽  
The Nakdong River ◽  
Reducible Fraction

In this study, the concentrations and characteristics of copper (Cu), zinc (Zn), and lead (Pb) contamination in sediment samples were investigated using aqua regia extraction and Tessier’s five-step sequential extraction. Based on the concentration of metals, the influence of the Hapcheon-Changnyeong weir on sediments in the Nakdong River was assessed. The origins of the contaminants, their bioavailability, and their mobility were determined using sequential extraction. Greater concentrations of heavy metals were found in samples collected closer to the weir. The largest proportion of Cu was identified in the residual fraction based on sequential extraction, whereas Zn was predominantly found in the reducible fraction. Iron-manganese in the reducible fraction of Zn has the potential to leach back to the water body. In addition, the combined concentration of fractions 1 and 2 of Cu comprised more than 20% of total amount that still has potential to affect the water quality. The results of this study were compared with existing sediment standards set out by the NIER (National Institute of Environmental Research), Canada, and US EPA (United States Environmental Protection Agency) guidelines, as well as the risk assessment code (RAC). The concentrations of heavy metals exceeded the standards set by the Canadian guideline by up to four times in particular samples, highlighting the need for continual monitoring.

scholarly journals Effect of the Human Utilization of Northern Snakehead (Channa argus Cantor, 1842) on the Settlement of Exotic Fish and Cladoceran Community Structure

2021 ◽  
Vol 13 (5) ◽  
pp. 2486
Author(s):  
Jong-Yun Choi ◽  
Seong-Ki Kim
Keyword(s):  
Community Structure ◽  
Fish Species ◽  
Micropterus Salmoides ◽  
Lepomis Macrochirus ◽  
Nakdong River ◽  
Exotic Fish ◽  
Carnivorous Fish ◽  
Channa Argus ◽  
The Nakdong River ◽  
Exotic Fish Species

Empirical studies suggest that changes in the density of top predators, such as carnivorous fish, in freshwater food webs, strongly affect not only fish communities but also various primary and secondary consumers. Based on these findings, we explored how differences in the utilization of carnivorous fish (i.e., Northern Snakehead, Channa argus) by humans affected the fish and cladoceran community structure as well as the settlement of exotic fish species (i.e., Lepomis macrochirus and Micropterus salmoides) in 30 wetlands located in the upper and lower reaches of the Nakdong River. Our results show that in the mid–lower reaches of the Nakdong River, the density of C. argus was low, while high densities of L. macrochirus and M. salmoides were observed. Exotic fish species are frequently consumed by C. argus, leading to a low density of L. macrochirus and M. salmoides in the upper reaches, which supported a high density of C. argus. However, in the mid–lower reaches, the density of L. macrochirus was high because of the frequent collection of C. argus by fishing activities. The dominance of L. macrochirus significantly changed the structure of cladoceran communities. L. macrochirus mainly feeds on pelagic species, increasing the density of epiphytic species in the mid–lower reaches. The continued utilization of C. argus by humans induced a stable settlement of exotic fish species and strongly affected the community structures of primary consumers in the 30 wetlands. The frequency of C. argus collection has to be reduced to secure biodiversity in the mid–lower reaches of the Nakdong River, which will reduce the proportion of exotic fish species and increase the conservation of native fish.

scholarly journals Prioritization in Strategic Environmental Assessment Using Fuzzy TOPSIS Method with Random Generation for Absent Information in South Korea

2021 ◽  
Vol 13 (3) ◽  
pp. 1458
Author(s):  
Daeryong Park ◽  
Huan-Jung Fan ◽  
Jun-Jie Zhu ◽  
Taesoon Kim ◽  
Myoung-Jin Um ◽  
...  
Keyword(s):  
Decision Making ◽  
Multicriteria Decision Making ◽  
Fuzzy Topsis ◽  
River Basins ◽  
Ideal Solution ◽  
Missing Information ◽  
Nakdong River ◽  
Han River ◽  
Priority Ranking ◽  
The Nakdong River

This study evaluated a fuzzy technique for order performance by similarity to ideal solution (TOPSIS) as a multicriteria decision making system that compensates for missing information with undefined weight factor criteria. The suggested Fuzzy TOPSIS was applied to ten potential dam sites in three river basins (the Han River, the Geum River, and the Nakdong River basins) in South Korea. To assess potential dam sites, the strategic environment assessment (SEA) monitored four categories: national preservation, endangered species, water quality, and toxic environment. To consider missing information, this study applied the Monte Carlo Simulation method with uniform and normal distributions. The results show that effects of missing information generation with one fuzzy set in GB1 site of the Geum River basin are not great in fuzzy positive-ideal solution (FPIS) and fuzzy negative-ideal solution (FNIS) estimations. However, the combination of two fuzzy sets considering missing information in Gohyun stream (NG) and Hoenggye stream (NH) sites of the Nakdong River basin has a great effect on estimating FPIS, FNIS, and priority ranking in Fuzzy TOPSIS applications. The sites with the highest priority ranking in the Han River, Geum River, and Nakdong River basins based on Fuzzy TOPSIS are the Dal stream 1 (HD1), Bocheong stream 2 (GB2) and NG sites. Among the sites in all river basins, the GB2 site had the highest priority ranking. Consequently, the results coincided with findings of previous studies based on multicriteria decision making with missing information and show the applicability of Fuzzy TOPSIS when evaluating priority rankings in cases with missing information.

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