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Analysis of Water Quality Improvement Effect by Securing Water Quality Characteristics and Flow Rate in the Geumho River

  • Journal of Environmental Impact Assessment
  • Abbr : J EIA
  • 2020, 29(6), pp.414-429
  • Publisher : Korean Society Of Environmental Impact Assessment
  • Research Area : Engineering > Environmental Engineering
  • Received : September 16, 2020
  • Accepted : November 4, 2020
  • Published : December 29, 2020

Insoo Kwak 1,  Boram Choi 1,  Hyeryn Jeon 1,  Sunae Kim 1,  Jaehyeong Bae 1,  Shin Kim 1,  Jungmin Kim 1

1국립환경과학원 낙동강물환경연구소

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ABSTRACT

For the management of rivers, the target water quality is set by establishing the total amount of water pollution and water environment basic plan. For Geumho river T-P has achieved the target water quality, but for BOD, COD, TOC the target water quality of the water environment basic plan has been exceed for the past five years. Therefore, the flow rate for satisfying the target water quality was simulated by analyzing the load, load density, and pollution contribution rate of the Geumho river using BOD, COD, TOC and by utilizing QUAL-MEV a one-dimensional water quality model. According to the analysis of the load, the BOD, COD and TOC all showed the highest levels at the Geumho C point at 9,832.2 kg/day 20,656.6 kg/day, and 15,545.1 kg/day. The load density was highest at 9.47 kg/day/km2, 37.55 kg/day/km2, 30.20 kg/day/km2, and 17.19 kg/day/ km2, 39.14 kg/day/km2 in Dalseocheon stream during the wet seasons and dry seasons. Pollution contribution rate was highest at about 25 percent for Palgeocheon stream during the wet season and about 50 percent for Dalseocheon stream during the dry season. In addition, the correlation analysis between organic materials showed in the main stream and tributaty of the Geumho river that COD-TOC was 0.8 or higherthan BOD-COD and BOD-TOC in both the wet seasons and dry seasons. And after surveying the total amount of water pollution and the target quality of the water environment basic plan at Geumho C, it was analyzed that an additional flow tate of 14 times and 22 times was needed as of April 2019 (3.46 m3/sec).

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