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Water 2019, 11(3), 512; https://doi.org/10.3390/w11030512

Investigating Influence of Hydrological Regime on Organic Matters Characteristic in a Korean Watershed

1
School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
2
Water Quality Assessment Research Division, National Institute of Environmental Research, Environmental Research Complex, Incheon 22689, Korea
*
Authors to whom correspondence should be addressed.
Received: 3 February 2019 / Revised: 6 March 2019 / Accepted: 7 March 2019 / Published: 12 March 2019
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Abstract

Source tracking of dissolved organic matter (DOM) is important to manage water quality in rivers. However, it is difficult to find the source of this DOM because various DOMs can be added from the river watershed. Moreover, the DOM composition can be changed due to environmental conditions. This study investigated the change of organic matter characteristics in the Taewha River of Ulsan City, Korea, before and after rainfall. A Soil and Water Assessment Tool (SWAT) was used to simulate water flow from various sources, and dissolved organic matter characterization was conducted in terms of molecular size distribution, hydrophobicity, fluorescence excitation and emission, and molecular composition. From the results, it was found that lateral flow transported hydrophobic and large-molecule organic matter after rainfall. According to the orbitrap mass spectrometer analysis, the major molecular compound of the DOM was lignin. Coupling the SWAT model with organic matter characterization was an effective approach to find sources of DOM in river. View Full-Text
Keywords: dissolved organic matter (DOM); soil and water assessment tool (SWAT); orbitrap mass spectrometry; fluorescence excitation emission matrix (EEM) dissolved organic matter (DOM); soil and water assessment tool (SWAT); orbitrap mass spectrometry; fluorescence excitation emission matrix (EEM)
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Baek, S.; Lee, H.; Park, J.; Cho, K.H. Investigating Influence of Hydrological Regime on Organic Matters Characteristic in a Korean Watershed. Water 2019, 11, 512.

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