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Dynamics of dissolved organic matter in riverine sediments affected by weir impoundments: Production, benthic flux, and environmental implications

Title
Dynamics of dissolved organic matter in riverine sediments affected by weir impoundments: Production, benthic flux, and environmental implications
Author
김성한
Keywords
DOM; Pore water; EEM-PARAFAC; Impoundment; Benthic flux; Mass balance; CARBON BURIAL EFFICIENCY; ARCTIC-OCEAN SEDIMENTS; OXYGEN EXPOSURE TIME; FLUORESCENCE SPECTROSCOPY; PORE WATERS; CONSTRUCTED RESERVOIR; MOLECULAR-WEIGHT; MARINE; COASTAL; TERRESTRIAL
Issue Date
2017-05
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
WATER RESEARCH, v. 121, Page. 150-161
Abstract
In order to understand the characteristics and dynamics of dissolved organic matter (DOM) in the sediment of rivers affected by impoundments, we examined the vertical profiles and the benthic fluxes of DOM in four different core sediments located at upstream sites of weirs in major rivers of South Korea. In three out of four sites, exponential accumulation of dissolved organic carbon (DOC) with depth was observed with the signature of seasonal variability. Except for the site displaying a below-detection limit of Fe(II), the general accumulation trends of DOC with depth was concurrent with the increases of Fe(II) and NH4+ and the decrease of PO43-, signifying a close linkage of the DOM dynamics with anaerobic respiration via iron reduction, an important early diagenesis pathway. The estimated benthic fluxes from the cores revealed that the sediments likely serve as DOC, chromophoric DOM (CDOM), and fluorescent DOM (FDOM) sources to the overlying water. The benthic effluxes based on DOC were comparable to the ranges previously reported in lake and coastal areas, and those of CDOM and FDOM showed even higher levels. These findings imply that impoundment-affected river systems would change the DOM composition of the overlying water, ultimately influencing the subsequent water treatment processes such as disinfection byproducts production and membrane fouling. A simple mass balance model indicated that the impoundment-affected river sediments may operate as a net carbon sink in the environments due to a greater extent of sedimentation compared to the estimated benthic efflux and sediment biological respiration. (C) 2017 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0043135417303810http://repository.hanyang.ac.kr/handle/20.500.11754/72071
ISSN
0043-1354
DOI
10.1016/j.watres.2017.05.022
Appears in Collections:
RESEARCH INSTITUTE[E](부설연구소) > INSTITUTE OF OCENA AND ATMOSPHERIC SCIENCES(해양ㆍ대기과학연구소) > Articles
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