| Title |
Estimating TOC Concentrations Using an Optically-Active Water Quality Factors in Estuarine Reservoirs |
| Authors |
김진욱 ( Kim Jinuk ) ; 장원진 ( Jang Wonjin ) ; 신재기 ( Shin Jaeki ) ; 강의태 ( Kang Euntae ) ; 김진휘 ( Kim Jinhwi ) ; 박용은 ( Park Yongeun ) ; 김성준 ( Kim Seongjoon ) |
| DOI |
https://doi.org/10.15681/KSWE.2021.37.6.531 |
| Keywords |
Data conversion; Estuarine reservoir; Optical properties; Total organic carbon; Water quality data |
| Abstract |
In this study, the TOC in six estuarine reservoirs in the West Sea (Ganwol, Namyang, Daeho, Bunam, Sapkyo, and Asan) was estimated using optically-active water quality factors by the water environment monitoring network. First, specification data and land use maps of each estuarine reservoir were collected. Subsequently, water quality data from 2013 to 2020 were collected. The data comprised of 11 parameters: pH, dissolved oxygen, BOD, COD, suspended solids (SS), total nitrogen, total phosphorus, water temperature, electrical conductivity, total coliforms, and chlorophyll-a (Chl-a). The TOC in the estuarine reservoirs was 4.9~7.0 mg/L, with the highest TOC of 7.0 mg/L observed at the Namyang reservoir, which has a low shape coefficient and high drainage density. The correlation of TOC with water quality factors was also analyzed, and the correlation coefficients of Chl-a and SS were 0.28 and 0.19, respectively, while the correlation coefficients of these factors in the Namyang reservoir were 0.42 and 0.27, respectively. To improve the estimation of TOC using Chl-a and SS, the TOC was averaged in 5 mg/L units, and Chl-a and SS were averaged. Correlation analysis was then performed and the R2 of Chl-a-TOC was 0.73. The R2 of SS-TOC was 0.73 with a non-linear relationship. TOC had a significant non-linear relationship with Chl-a and SS. However, the relationship should be assessed in terms of the spatial and temporal variations to construct a reliable remote sensing system. |