Long-term environmental changes in the Geum Estuary (South Korea): Implications of river impoundments
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Title
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Long-term environmental changes in the Geum Estuary (South Korea): Implications of river impoundments
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Other Titles
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금강하구의 장기적 확경 변화
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Authors
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Kang, Sujin
Kim, Jung-Hyun
Joe, Young Jin
Jang, Kwangchul
Nam, Seung-il
Shin, Kyung-Hoon
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Subject
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Environmental Sciences & Ecology; Marine & Freshwater Biology
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Keywords
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Geum Estuary; Sedimentary organic carbon; Stable carbon isotope; n-Alkanes; River impoundment
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Issue Date
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2021-07
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Citation
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Kang, Sujin, et al. 2021. "Long-term environmental changes in the Geum Estuary (South Korea): Implications of river impoundments". MARINE POLLUTION BULLETIN, 168: 1-7.
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Abstract
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We investigated a sediment core collected from the Geum Estuary through sedimentological and geochemical analyses. Three lithological units were classified based on sedimentological characteristics. Unit 1 and Unit 3 were geochemically distinct, while Unit 2 was the transitional phase between them. The geochemical results suggest that the contribution of terrestrial organic carbon (OC) to the sedimentary OC pool in the coarse-grained Unit 1 was lesser than that of fine-grained Unit 3. The excess activity (210Pbex) and the sedimentation rate indicate that Unit 1 corresponded to 1977 Common Era (CE). Since the first dam construction on the Geum River began in 1975 CE, the deposition of Unit 1 in the Geum Estuary is likely associated with river impoundments, which reduce the delivery of fine-grained sediment and terrestrial OC to the estuary. This study highlights the role of river impoundments in altering the sedimentary OC and thus the sedimentary environment in the estuary.
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URI
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https://repository.kopri.re.kr/handle/201206/13636
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DOI
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http://dx.doi.org/10.1016/j.marpolbul.2021.112383
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Type
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Article
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Station
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기타()
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Indexed
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SCIE
- Appears in Collections
- 2020-2020, Changes in environments and coastal geomorphology of Svalbard fjords, Arctic (20-20) / Nam, Seung-il (PN20090)
2019-2019, Organic carbon transfer across the river-sea interface: a case study in Geum and Sumjin river systems (19-19) / Kim, Junghyun (PN19100)
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