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KMID : 1024520210300070507
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Journal of the Environmental Sciences
2021 Volume.30 No. 7 p.507 ~ p.517
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Bathymetric Changes in the Nakdong River Estuary owing to Discharge from the Nakdong River Barrier and Environmental Factors
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Kim Ki-Cheol
Kim Sung-Bo
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Abstract
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In this study, the bathymetric data acquired from 2018 to 2020 and the precipitation and suspended sediment data were analyzed for changes in bathymetry owing to the discharge from the Nakdong River barrier and environmental factors, especially the torrential rain in 2020. Sediment erosion and deposition processes are repeated because of complex environmental factors such as discharge from the Nakdong River barrier and the influence of waves generated from the external sea. In the first half of the year after the dry season, bathymetric data showed relative erosion trends, whereas in the second half after the flood season, deposition trends were identified owing to the increase in sediment transport. However, the data from the second half of 2020 showed a large amount of erosion, resulting in tendencies different to those of erosion in the first half and deposition in the second half of the year. This result is judged to be influenced by the weather in the summer of 2020. The torrential rain in the summer of 2020 resulted in a higher force of erosion than that of deposition. In summary, the tendency for erosion is more significant than that of sedimentation, especially in the main channel area of the Nakdong River.
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KEYWORD
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Nakdong-River estuary, Bathymetry, Discharge, Suspended sediments, Precipitation
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