Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Temporal and Spatial Characteristics of Water Quality in a River-Reservoir (Paldang)

하천형 호수인 팔당호 수질의 시공간적 특성

  • Kong, Dongsoo (Department of Bioconvergence, Kyonggi University) ;
  • Min, Jeong-Ki (Department of Bioconvergence, Kyonggi University) ;
  • Byeon, Myeongseop (Han River Research Center, National Institute of Environmental Research) ;
  • Park, Hae Kyung (Nakdong River Research Center, National Institute of Environmental Research) ;
  • Cheon, Se-Uk (Keum River Research Center, National Institute of Environmental Research)
  • 공동수 (경기대학교 바이오융합학부) ;
  • 민정기 (경기대학교 바이오융합학부) ;
  • 변명섭 (국립환경과학원 한강물환경연구소) ;
  • 박혜경 (국립환경과학원 낙동강물환경연구소) ;
  • 천세억 (국립환경과학원 금강물환경연구소)
  • Received : 2018.08.01
  • Accepted : 2018.09.04
  • Published : 2018.09.30
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Abstract

This study is to investigate the allochthonous load and water quality of a typical river-reservoir, Paldang during spring (March ~ May) of 17 years (2001 ~ 2017). Phosphorus loading from point sources seems to have been reduced by 74 % in the 2010s. As a result, trophic state of the Paldang reservoir, eutrophic during the 2000s, has returned to the lmesotrophic state. Along with decrease in phosphorus concentration, standing crops of algae (Chl.a) decreased, and concentration of biodegradable organic material decreased to the past level. Concentration of total suspended solids has decreased, and it is due to the decrease of phytoplankton standing crops since the mid-2000s. As transparency increased, it is estimated that euphotic area increased by 22 % and euphotic capacity expanded by 27 %. In the river/transition zone of Paldang, concentration of organic matter increases slightly due to algal growth, but concentration of all water quality items decreases in the lacustrine zone. Although algal growth rate revealed positive correlation with concentration of phosphorus, it was insignificant. Algal growth appeared to be dependent on renewal of phosphorus by flow, than either flow rate or phosphorus concentration. The empirical model including inflow phytoplankton concentration fit well with observed values, and indicates the Paldang reservoir is greatly influenced by allochthonous loads.

Keywords

References

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