Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Effects of Water Temperature, Light and Dredging on Benthic Flux from Sediment of the Uiam Lake, Korea

의암호에서 퇴적물 용출에 대한 수온, 빛과 퇴적물 제거의 영향

  • Youn, Seok Jea (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Hun Nyun (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Yong Jin (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Im, Jong Kwon (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Lee, Eun Jeong (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Yu, Soon Ju (Han River Environment Research Center, National Institute of Environmental Research)
  • 윤석제 (국립환경과학원 한강물환경연구소) ;
  • 김헌년 (국립환경과학원 한강물환경연구소) ;
  • 김용진 (국립환경과학원 한강물환경연구소) ;
  • 임종권 (국립환경과학원 한강물환경연구소) ;
  • 이은정 (국립환경과학원 한강물환경연구소) ;
  • 유순주 (국립환경과학원 한강물환경연구소)
  • Received : 2017.07.19
  • Accepted : 2017.10.20
  • Published : 2017.11.30
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Abstract

An experiment to study the effect of temperature, light, and dredging on release of nutrients downstream from Gongjicheon in the Uiam reservoir was carried out in the laboratory using sediments from different depths. At various water temperatures, dissolved total nitrogen was not released, but the average nutrient flux of dissolved total phosphorus was increased (0.034 at $15^{\circ}C$, 0.005 at $20^{\circ}C$, 0.154 at $25^{\circ}C$, $0.592mg/m^2/d$ at $30^{\circ}C$). Dissolved total phosphorous was released in controlled darkness. In contrast, in controlled light, the concentrations of dissolved total phosphorous and dissolved total nitrogen in the overlying water steadily decreased during the study period (70 d), because they were continuously consumed by the growth of photosynthetic algae. However, there was no significant relationship between water nutrient concentration, nutrient release, and the depth of the sediment. We concluded that the dredging of sediment would not affect the nutrient release rate of the sediment, because there were no significant differences in the nutrient concentrations released from the sediment. When the sediment was removed from the surface to 20 cm in depth, the nutrients were not transferred to the water body, implying that the sediment removal had little effect on secondary pollution.

Keywords

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