The Response of Dissolved Organic Matter during Monsoon and Post-Monsoon Periods in the Regulated River for Sustainable Water Supply

Mei-Yan Jin, Hye-Ji Oh, Kyung-Hoon Shin, Min-Ho Jang, Hyun-Woo Kim, Bohyung Choi, Zi-Yu Lin, Jeong Sook Heo, Jong-Min Oh and Kwang-Hyeon Chang
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Mei-Yan Jin: Department of Environmental Science and Engineering, Kyung Hee University, Yongin 17104, Gyeonggi, Korea
Hye-Ji Oh: Department of Environmental Science and Engineering, Kyung Hee University, Yongin 17104, Gyeonggi, Korea
Kyung-Hoon Shin: Department of Marine Sciences and Convergent Technology, Hanyang University, Ansan 426-791, Korea
Min-Ho Jang: Department of Biology Education, Kongju National University, Gongju 32588, Korea
Hyun-Woo Kim: Department of Environmental Education, Sunchon National University, Suncheon 57922, Korea
Bohyung Choi: Fisheries Science Institute, Chonnam National University, Yeosu 59626, Korea
Zi-Yu Lin: Department of Environmental Science and Engineering, Kyung Hee University, Yongin 17104, Gyeonggi, Korea
Jeong Sook Heo: Department of Environmental Science and Engineering, Kyung Hee University, Yongin 17104, Gyeonggi, Korea
Jong-Min Oh: Department of Environmental Science and Engineering, Kyung Hee University, Yongin 17104, Gyeonggi, Korea
Kwang-Hyeon Chang: Department of Environmental Science and Engineering, Kyung Hee University, Yongin 17104, Gyeonggi, Korea

Sustainability, 2020, vol. 12, issue 13, 1-14

Abstract: Dissolved organic matter (DOM) in rivers are an important factor in pollution management due to the abundance of stored carbon. Using fluorescent spectroscopy, we investigated the temporal and spatial dynamics of DOM compositions, as well as their properties, for two of the major four regulated rivers—Han River (HR) and Geum River (GR) in South Korea. We collected eight sampling sites, four from each of the two rivers (from close to the weirs) in order to observe the integrated effects of different land use (terrestrial input) during the monsoon (July) and post-monsoon periods (September). High integral values of DOM compositions (July: 30.81 ± 9.71 × 10 3 vs. September: 1.78 ± 0.66 × 10 3 ) were present in all eight sites after heavy rainfall during the monsoon period, which indicated that Asian monsoon climates occupy a potent role in the DOM compositions of the rivers. Regarding DOM compositions, tryptophan-like and fulvic acid-like components were predominant in HR and GR, especially in GR with high integral values of protein-like and humus components. However, the properties of terrestrial DOM between HR and GR are markedly different. These results considered due to the different land use, where the terrestrial DOM shows a low degree of humification due to a high percentage of agriculture and urban land use in GR. Furthermore, these two rivers are typical regulated rivers, due to their weir constructions. High values of DOM components were present in the downstream of the weirs; however, increasingly high patterns appeared in the HR because of heavy rainfall (511.01 mm in HR; 376.33 mm in GR). In addition, a lower increasing trend of humic-like component was present in the GR due to a low percentage of forest land use/cover. These results suggest that the effect of the weir on rivers can be highlighted by the different percentages of land use/cover under the conditions of the monsoon period. Hence, DOM fluorescence can serve as an effective indicator for providing an early signal for the complex impacts of the different land use and rainfall in the regulated river systems.

Keywords: dissolved organic matter (DOM); monsoon period; terrestrial input; land use (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
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