| Title |
A Study on Spatial and Temporal Patterns of Water Quality in the Middle Area of the Nakdong River, Korea |
| Authors |
나은혜 ( Eun Hye Na ) ; 박수영 ( Suyoung Park ) ; 김종하 ( Jongha Kim ) ; 임성수 ( Seongsoo Im ) ; 김경현 ( Kyunghyun Kim ) |
| DOI |
https://doi.org/10.15681/KSWE.2015.31.6.723 |
| Keywords |
Algal bloom; DO depletion; Gangjung-Goryoung weir; Nakdong river; Thermal stratification |
| Abstract |
We investigated the spatial and temporal patterns of water quality in the Gangjung-Goryoung weir that is located in the middle area of the Nakdong river, Korea. The monitoring results indicated that there are discernible vertical differences in water quality during the pre- and post-monsoon periods (May to September). During this period, it was observed that the weak thermal stratification formed at the maximum level, and pH, Chl-a, and DO concentrations in the surface layer were higher than those in the bottom layer. This vertical difference was especially noticeable for DO concentrations: there were DO depletions at the bottom layer in late June to early August. During the summer monsoon period with heavy rainfall, there was a decline in vertical differences in water quality. From this study, it was suggested that continuous monitoring of vertical profiles could become a useful tool for identifying the spatial and temporal distributions of water quality and for developing the best management policy for water quality in the Nakdong river. |