Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Analysis of Seasonal Water Quality Variation of a Natural Wetland in the Nakdong River Basin

낙동강 수계 자연습지의 계절별 수질변화특성 분석

  • Kim, Young Ryun (Department of Environmental Engineering, Pukyong National University) ;
  • Lee, Kwang Sup (Department of Ecological Engineering, Pukyong National University) ;
  • Lee, Suk Mo (Department of Ecological Engineering, Pukyong National University) ;
  • Kang, Daeseok (Department of Ecological Engineering, Pukyong National University) ;
  • Sung, Kijune (Department of Ecological Engineering, Pukyong National University)
  • Received : 2009.05.28
  • Accepted : 2009.08.19
  • Published : 2009.09.30
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Abstract

A natural wetland in the Nakdong River basin which effectively removes non-point source pollutants was investigated for 2 years to understand wetland topography, vegetation types, and water quality characteristics. The water depth of the natural wetland was in the range of 0.5~1.9 m which is suitable for the growth of non-emergent hydrophytes. The wetland has a high length to width ratio (3.3:1) and a relatively large wetland to watershed area ratio (0.057). A broad-crested weir at the outlet increases the retention time of the wetland whose hydrology is mainly dependent on storm events. The concentrations of dissolved oxygen in the growing season and the winter season showed anoxic and oxic conditions, respectively. Diurnal variations of DO and pH in the growing season were also observed due to weather change and submerged plants. COD and TP concentrations were low in the winter season due to low inflow rate and increased retention time. Increased TP concentrations in the spring season were caused by degradation of dead wetland plants. Nitrogen in the wetland was mostly in organic nitrogen form (>75%). During the growing season, ammonium concentration was high but nitrate nitrogen concentration was low, possibly due to anoxic and low pH conditions which are adverse conditions for ammonificaiton and nitrification. The results of this study can be used as preliminary data for design, operation, monitoring and management of a constructed wetland which is designed to treat diffuse pollutants in the Nakdong river watershed.

Keywords

Acknowledgement

Supported by : 한국산업기술재단, 한국과학재단

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