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A Study on Spatial and Temporal Patterns of Water Quality in the Middle Area of the Nakdong River, Korea

낙동강 중류 보 구간에서의 시 · 공간적 수질 분포 특성 연구

Na, Eun Hye;Park, Suyoung;Kim, Jongha;Im, Seongsoo;Kim, Kyunghyun
나은혜;박수영;김종하;임성수;김경현

  • Received : 2015.11.03
  • Accepted : 2015.11.27
  • Published : 2015.11.30

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.

Keywords

Algal bloom;DO depletion;Gangjung-Goryoung weir;Nakdong river;Thermal stratification

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  1. Spatiotemporal and Longitudinal Variability of Hydro-meteorology, Basic Water Quality and Dominant Algal Assemblages in the Eight Weir Pools of Regulated River (Nakdong) vol.51, pp.4, 2018, https://doi.org/10.11614/KSL.2018.51.4.268