Trend Analysis Using Long-Term Monitoring Data of Water Quality at Churyeongcheon and Yocheon Basins

Don-Woo Ha, Kang-Young Jung, Jonghun Baek, Gi-Soon Lee, Youngjea Lee, Dong Seok Shin and Eun Hye Na ()
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Don-Woo Ha: Department of Yeongsan River Environment Research Laboratory, National Institute of Environmental Research, 5, Cheomdangwagi-ro 208beon-gil, Buk-gu, Gwangju 61011, Korea
Kang-Young Jung: Department of National Institute of Environmental Human Resources Development, 42, Hwangyeong-ro, Seo-gu, Incheon 22689, Korea
Jonghun Baek: Department of Yeongsan River Environment Research Laboratory, National Institute of Environmental Research, 5, Cheomdangwagi-ro 208beon-gil, Buk-gu, Gwangju 61011, Korea
Gi-Soon Lee: Department of Yeongsan River Environment Research Laboratory, National Institute of Environmental Research, 5, Cheomdangwagi-ro 208beon-gil, Buk-gu, Gwangju 61011, Korea
Youngjea Lee: Department of Yeongsan River Environment Research Laboratory, National Institute of Environmental Research, 5, Cheomdangwagi-ro 208beon-gil, Buk-gu, Gwangju 61011, Korea
Dong Seok Shin: Department of Yeongsan River Environment Research Laboratory, National Institute of Environmental Research, 5, Cheomdangwagi-ro 208beon-gil, Buk-gu, Gwangju 61011, Korea
Eun Hye Na: Department of Watershed and Total Load Management Research, National Institute of Environmental Research, Hwangyeong-ro, Seo-gu, Incheon 22689, Korea

Sustainability, 2022, vol. 14, issue 15, 1-18

Abstract: In this study, we investigated the interrelationships between organic matter and water quality indices in the total maximum daily load basins, namely, Churyeongcheon and Yocheon of the Seomjin River system, and identified trends. Churyeong A and Yocheon B, the basins being analyzed, have high proportions of nonpoint pollution sources and pollutant loads from terrestrial sources. During the study period, biochemical oxygen demand (BOD) decreased in both basins, whereas chemical oxygen demand (COD) and total organic carbon (TOC) increased in Churyeong A and decreased in Yocheon B. The increase in organic matter in Churyeong A correlated with the flow rate, whereas organic matter in Yocheon B showed little correlation with flow rate. Variations in organic matter (BOD, COD, and TOC) in Churyeong A exhibited seasonality under the influence of increased flow rate. Organic matter in Yocheon B was affected by increased flow rate, wherein with time, BOD decreased and COD and TOC increased. This study provides basic data that can be used as a reference to facilitate continuous water management and appropriate strategy implementation by analyzing the influencing factors and trends of organic matter using long-term measurement data.

Keywords: total maximum daily load; tributary monitoring; pollutant loads; regression model; LOAD ESTimator model; water quality; climate change (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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