Elemental (C/N ratios) and Isotope (δ13Ctoc, δ15Ntn) Compositions of Surface Sediments from the Barrier Islands in the Nakdong River Estuary, South Korea

Title
Elemental (C/N ratios) and Isotope (δ13Ctoc, δ15Ntn) Compositions of Surface Sediments from the Barrier Islands in the Nakdong River Estuary, South Korea
Author(s)
이준호; 우한준; 정갑식; 강정원; 최재웅; 이동원
KIOST Author(s)
Lee, Jun Ho(이준호)Woo, Han Jun(우한준)Jeong, Kap Sik(정갑식)Kang, Jeong Won(강정원)
Publication Year
2017-04-23
Abstract
The Nakdong River Estuary (NRE) in South Korea is a typical, artificially-manipulated estuary and blocked by two large dam. The Noksan Dam, built in 1934, blocks the flow of the West Nakdong River, and the NRE Dam was completed between 1983 and 1987 to regulate the flow of the East Nakdong River (called the Eulsuk River locally). For the past half century, several huge industrial complexes have been developed in the reclaimed land near the NRE. In the estuary, the hydraulic circulation has been markedly modified caused by the changes in the river discharge and geomorphic configuration of such as the formation of a series of barrier islands, the two large dams resulting from the artificial control of the natural river flow and upstream intrusion of saltwater by the operation of the two large dams. Consequently, the saltwater wedge that once reached approximately 40 km upstream is now blocked at the dam, considerably reducing the tidal prism. The estuary is typified by barrier-lagoon system with various subenvironments and microtidal with a 1.5 m tidal range.We investigated the elemental (C/N ratios) and isotopic (δ13Ctoc, δ15Norg) compositions of organic matters in various composition in the surface sediments in the NRE. In May 2015, 90 surface sediment samples were collected on and around three islands in the NRE. The mean grain size of the barrier island system in the NRE ranged from 1.1 to 8.9 Φ (average 3.9 and 1987 to regulate the flow of the East Nakdong River (called the Eulsuk River locally). For the past half century, several huge industrial complexes have been developed in the reclaimed land near the NRE. In the estuary, the hydraulic circulation has been markedly modified caused by the changes in the river discharge and geomorphic configuration of such as the formation of a series of barrier islands, the two large dams resulting from the artificial control of the natural river flow and upstream intrusion of saltwater by the operation of the two large dams. Consequently, the saltwater wedge that once reached approximately 40 km upstream is now blocked at the dam, considerably reducing the tidal prism. The estuary is typified by barrier-lagoon system with various subenvironments and microtidal with a 1.5 m tidal range.We investigated the elemental (C/N ratios) and isotopic (δ13Ctoc, δ15Norg) compositions of organic matters in various composition in the surface sediments in the NRE. In May 2015, 90 surface sediment samples were collected on and around three islands in the NRE. The mean grain size of the barrier island system in the NRE ranged from 1.1 to 8.9 Φ (average 3.9
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24044
Bibliographic Citation
European Geosciences Union (EGU) 2017, pp.1, 2017
Publisher
European Geosciences Union (EGU) 2017
Type
Conference
Language
English
Publisher
European Geosciences Union (EGU) 2017
Related Researcher
Research Interests

Coastal Sedimentary Processes,Micropaleontology(Foraminifera and Pollen),Paleoenvironmental Reconstruction,연안퇴적작용,미고생물(유공충 및 화분),고환경 복원

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