부산 온천천의 하계 우수기 수질 및 퇴적물 환경 특성 KCI

Title
부산 온천천의 하계 우수기 수질 및 퇴적물 환경 특성
Alternative Title
Characteristics of Water and Sediment Qualities in the Oncheon Stream, Busan during Summer Rainy Season
Author(s)
이영형; 문창호; 강현정; 최성률; 김석현
KIOST Author(s)
Kim, Suk Hyun(김석현)
Publication Year
2020-06
Abstract
Water and sediment qualities were investigated in the Oncheon Stream and at the Wondong bridge of the Suyoung River, during the summer rainy season, 2019. Dissolved oxygen (DO) showed the lowest levels at 4.7 and 5.0 m/L, and biogeochemical oxygen demand (BOD) showed the highest at 5.3 mg/L downstream where the tributary flows into the main river. Chemical oxygen demand (COD) increased from 2.0 to 5.9 mg/L on average as it flowed downstream, The COD/BOD ratio decreased gradually as it flowed downstream, reaching 1.0. However, COD/BOD ratio at the Wondong bridge was 5.8-22.2, indicating that easily biodegradable and non-biodegradable organic matter flows into the Oncheon Stream and Suyoung River, respectively.
Total nitrogen (T-N) / total phosphorus (T-P) ratio tended to decrease from 72 to 21 as it flowed downstream, measuring 71 to 86 at the Wondong bridge. The water quality index (WQI) generally improved better than grade IV after heavy rainfalls. However, DO and T-P were the parameters that deteriorated the WQI. Ignition loss (IL), COD, T-N, and T-P of sediments had distribution of 1.44 ± 1.01%, 0.35 ± 0.16%, 43 ± 63 mg/kg, and 10.9 ± 21.9 mg/kg, respectively. These were several times lower than the annual averages of IL, T-N, and T-P in 2017 before the dredging project was conducted in the first half of 2018.
ISSN
1225-4517
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/38623
DOI
10.5322/JESI.2020.29.6.659
Bibliographic Citation
한국환경과학회지, v.29, no.6, pp.659 - 672, 2020
Publisher
한국환경과학회
Keywords
Oncheon Stream; Water quality; Sediment; Water quality index
Type
Article
Language
Korean
Publisher
한국환경과학회
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