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Assessing environmental changes in Lake Shihwa, South Korea, based on distributions and stable carbon isotopic compositions of n-alkanes

Title
Assessing environmental changes in Lake Shihwa, South Korea, based on distributions and stable carbon isotopic compositions of n-alkanes
Author
신경훈
Keywords
Lake Shihwa; Sedimentary organic matter; n-alkanes; Stable carbon isotope; Dike construction; Tidal power plant
Issue Date
2018-07
Publisher
ELSEVIER SCI LTD
Citation
ENVIRONMENTAL POLLUTION, v. 240, Page. 105-115
Abstract
We investigate historical environmental changes in an artificial lake, Lake Shihwa in South Korea, based on bulk (TOC, TN, C/N ratio, delta C-13(TOC), and delta N-15(TN)) and molecular (concentrations and delta C-13 of n-alkanes) parameters, by analyzing riverbank sediments (n =12), lake surface sediments (n = 9), and lake core sediments (n = 108). Although the bulk organic parameters showed similar characteristics for all lake surface sediment samples, the distribution pattern and delta C-13 of n-alkanes revealed distinct differences between 2009 samples and 2012/2016 samples, This change of sedimentary organic matter characteristics can be attributed to operation of the tidal power plant that began in 2011, which improved lake water circulation and thus changed the lake sedimentary environment from anoxic to more oxic conditions. The vertical profiles of bulk and molecular lake sediment core records collected in 2009, especially at the site closest to the dike, showed a drastic shift around 1987, indicating that stronger anoxic sedimentary conditions prevailed after 1987. This is linked to sea dike construction in 1987, which prohibited sea-lake water exchange and thus deteriorated water quality in Lake Shihwa. We conclude that Lake Shihwa has experienced severe environmental changes due to human activities. (C) 2018 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0269749117351874http://repository.hanyang.ac.kr/handle/20.500.11754/81202
ISSN
0269-7491
DOI
10.1016/j.envpol.2018.04.098
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > MARINE SCIENCE AND CONVERGENCE ENGINEERING(해양융합공학과) > Articles
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