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Potential linkage between sediment oxygen demand and pore water chemistry in weir-impounded rivers

Title
Potential linkage between sediment oxygen demand and pore water chemistry in weir-impounded rivers
Authors
Lee M.-H.Jung H.-J.Kim S.-H.An S.-U.Choi J.H.Lee H.-J.Huh I.-A.Hur J.
Ewha Authors
최정현
SCOPUS Author ID
최정현scopus
Issue Date
2018
Journal Title
Science of the Total Environment
ISSN
0048-9697JCR Link
Citation
Science of the Total Environment vol. 619-620, pp. 1608 - 1617
Keywords
Dissolved organic matterEEM-PARAFACImpounded river sedimentPore waterSediment oxygen demand (SOD)
Publisher
Elsevier B.V.
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Due to recent weir construction on four major rivers in South Korea, sediment has accumulated in the river bottom near the weirs, which has in turn raised concerns over the quality of overlying water. In this study, the seasonal and spatial variations of sediment oxygen demand (SOD) and the influencing factors were explored using pore water chemistry for the weir-impounded rivers. Muddy and sandy sediment samples were taken from 24 different sites along the four major rivers in summer and autumn, 2016. The SOD was measured in a laboratory based on 10-hour incubation at in situ temperature. The measured pore water chemistry included the concentrations of dissolved organic carbon (DOC), total dissolved nitrogen (TDN), inorganic nitrogen (NH3-N, NO3-N, NO2-N), and phosphate phosphorous (PO4-P), and the optical properties from UV absorption spectra and fluorescence excitation-emission matrixes coupled with parallel factor analysis (EEM-PARAFAC). Significant differences in SOD values between muddy and sandy sediments were found only in summer (p = 0.047). The higher SOD in summer versus autumn (p = 0.015) was attributed to seasonal temperature differences. The higher NH3-N and the lower NO3-N of the pore water samples in summer versus autumn suggested that organic nitrogen decomposition via an ammonification and nitrification process could operate as an important factor for the SOD variations in summer and autumn, respectively. Principal component analysis revealed the mutual contributions of nitrogen-associated processes and the organic composition in pore water to increasing SOD levels. NH3-N in sediment pore water alone could be a good predictor for SOD. However, multiple regression analysis using NH3-N, fluorescence index and terrestrial humic-like components improved the estimation capability for SOD variations. © 2017 Elsevier B.V.
DOI
10.1016/j.scitotenv.2017.10.141
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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