| Title |
Spatial Distribution and ImjM*ovement of Water Quality in the Youiigrang Lake |
| Authors |
허인량 ( In-ryang Huh ) ; 이건호 ( Geon-ho Yi ) ; 정원구 ( Won-gu Jeong ) ; 권재혁 ( Jae-hyouk Kwon ) |
| DOI |
https://doi.org/10.15681/KSWE.2017.33.3.341 |
| Keywords |
Eutrophication; Salinity; TSIko; Youngrang Lake |
| Abstract |
From 2014 to 2016, water quality of Youngrang Lake was surveyed, according to the location and depth. Following observations were recorded. Distribution of dissolved oxygen in the water depth was investigated at the middle section and the downstream 1st, 3rd, 5th, when investigating the bottom lm interval anoxic layer. The organic matter and nutrient concentration distribution was COD upstream 2.8 mg/L, middle section 4.2 mg/L downstream 4.1 mg/L, which was more than two times higher in the bottom layer. The TP concentrations showed a similar trend as the COD, being 0.047 mg/L at upstream, 0.051 mg/L in the middle, and 0.059 mg/L downstream. Difference in salinity was observed at every survey period; the lowest salinity recorded 28.5% during the second survey, and highest was 32.1% in the fourth survey. Korean trophic state index (TSIko) showed eutrophic conditions in the middle section and downstream, whereas mesotrophic state was maintained elsewhere during the entire period. In order to evaluate the cause of water pollution of the Youngrang lake, regression analysis determined the relationship between salinity and DO, COD, TN，TP, Chl-a; the results indicated R2 from 0.63 to 0.95. Youngrang lake water quality had a close relationship with salinity due to inflow of seawater. As a result，in order to improve the quality of Youngrang lake, efficient incorporation of the amount of water through the seawater influent is considered the key. |