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Evaluation of Basin-Specific CH4 emission flux from Intertidal Flat Sediments of Sogeun-ri, Taean, Mid-west Korea

한국 서해안 태안 소근리 갯벌의 메탄가스 발생량 특성

  • Lee, Jun-Ho (Korea Institute of Ocean Science and Technology, Korean Seas Geosystem Research Unit.) ;
  • Jeong, Kap-Sik (Korea Institute of Ocean Science and Technology, Korean Seas Geosystem Research Unit.) ;
  • Woo, Han Jun (Korea Institute of Ocean Science and Technology, Korean Seas Geosystem Research Unit.) ;
  • Kang, Jeongwon (Korea Institute of Ocean Science and Technology, Korean Seas Geosystem Research Unit.) ;
  • Lee, Dong-Hun (Korea Institute of Ocean Science and Technology, Korean Seas Geosystem Research Unit.) ;
  • Jang, Seok (Korea Institute Ocean Science and Technology, Maritime Security Research Center) ;
  • Kim, Seong-Ryul (Korea Institute Ocean Science and Technology, Maritime Security Research Center)
  • 이준호 (한국해양과학기술원 관할해역지질연구단) ;
  • 정갑식 (한국해양과학기술원 관할해역지질연구단) ;
  • 우한준 (한국해양과학기술원 관할해역지질연구단) ;
  • 강정원 (한국해양과학기술원 관할해역지질연구단) ;
  • 이동헌 (한국해양과학기술원 관할해역지질연구단) ;
  • 장석 (한국해양과학기술원 해양방위센터) ;
  • 김성렬 (한국해양과학기술원 해양방위센터)
  • Received : 2013.11.04
  • Accepted : 2013.11.25
  • Published : 2014.05.31

Abstract

In March to August 2013, the emission of gases ($CH_4$, VOC, $CO_2$, $O_2$, and LEL) was measured three times from the intertidal flat sediments at Sogeun-ri, Taean-gun, in the Mid-western seashore of Korea by using chamber method. After analyzing gas emission concentrations inside of flux enclosure chamber by using a GC equipped with Agilent 6890. The gas emission fluxes were calculated from a linear regression of the changes in the concentrations with time. The ranges of gas flux during the experimental period were $+0.06{\sim}+0.60mg/m^2/hr$ for $CH_4$, $+58.45{\sim}+95.58mg/m^2/hr$ for $CO_2$, $-0.02{\sim}-0.20mg/m^2/hr$ for $O_2$, and $-0.60{\sim}+0.65mg/m^2/hr$ for VOC, respectively. The flux measurement results revealed that $CH_4$ fluxes during March in the relatively low sediment temperature ($14.5^{\circ}C$) were significantly higher ($+0.60mg/m^2/hr$) than during June and August ($+0.06{\sim}+0.18mg/m^2/hr$) in high sediment temperature ($32.0{\sim}36.8^{\circ}C$). $CH_4$ flux to mean size of sediments and temperature of inner chamber exhibited strong positive correlation ($R^2=-0.97$ and $R^2=-0.89$, respectively).

2013년 3월과 8월 사이 총 3회에 걸쳐 챔버를 이용하여 충남 태안 소근리 갯벌 퇴적물에서 가스들(메탄, 휘발성 유기화합물, 이산화탄소, 산소 및 가연성 가스)의 방출량을 측정하였다. 챔버 내에서 채취된 메탄의 농도는 가스크로마토그래피를, 그 외 가스종은 Multi-gas monitor를 이용하여 측정하였다. 각 가스 종들의 배출량(+) 또는 흡수량 (-)은 농도의 시간 변화율을 구한 후 1차 함수의 기울기를 이용하여 계산하였다. 다른 변수(퇴적물 함수율, 온도, 총유기탄소, 평균입도크기 및 챔버 내 온도) 또한 같은 장소에서 측정하였다. 메탄은 $+0.06{\sim}+0.60mg/m^2/hr$, 이산화탄소는 $+58.45{\sim}+95.58mg/m^2/hr$, 산소는 $-0.02{\sim}-0.20mg/m^2/hr$ 및 휘발성 유기화합물은 $-0.60{\sim}+0.65mg/m^2/hr$을 방출하거나 흡수하였다. 특히, 메탄은 여름철 높은 표층 퇴적물 온도($32.0{\sim}36.8^{\circ}C$)에서 양($+0.06{\sim}+0.18mg/m^2/hr$)보다 봄철에는 상대적으로 낮은 온도($14.5^{\circ}C$)에서 더 많은 양($+0.60mg/m^2/hr$)이 방출되었다. 퇴적물로부터 메탄의 방출량은 플럭스에 대한 표층퇴적물 입도 크기와 챔버 내부 온도와의 상관계수($R^2$)는 각각 -0.97, -0.89를 보였다.

Keywords

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