Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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Seasonal Variation of Thermal Effluents Dispersion from Kori Nuclear Power Plant Derived from Satellite Data

위성영상을 이용한 고리원자력발전소 온배수 확산의 계절변동

  • Ahn, Ji-Suk (Fishery and Ocean Information Division, National Fisheries Research & Development Institute) ;
  • Kim, Sang-Woo (East Sea Fisheries Research Institute, National Fisheries Research & Development Institute) ;
  • Park, Myung-Hee (Fishery and Ocean Information Division, National Fisheries Research & Development Institute) ;
  • Hwang, Jae-Dong (Fishery and Ocean Information Division, National Fisheries Research & Development Institute) ;
  • Lim, Jin-Wook (East Sea Fisheries Research Institute, National Fisheries Research & Development Institute)
  • 안지숙 (국립수산과학원 수산해양종합정보과) ;
  • 김상우 (국립수산과학원 동해수산연구소) ;
  • 박명희 (국립수산과학원 수산해양종합정보과) ;
  • 황재동 (국립수산과학원 수산해양종합정보과) ;
  • 임진욱 (국립수산과학원 동해수산연구소)
  • Received : 2013.10.24
  • Accepted : 2014.11.12
  • Published : 2014.12.31
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Abstract

In this study, we investigated the seasonal variation of SST(Sea Surface Temperature) and thermal effluents estimated by using Landsat-7 ETM+ around the Kori Nuclear Power Plant for 10 years(2000~2010). Also, we analyzed the direction and range of thermal effluents dispersion by the tidal current and tide. The results are as follows, First, we figured out the algorithm to estimate SST through the linear regression analysis of Landsat DN(Digital Number) and NOAA SST. And then, the SST was verified by compared with the in situ measurement and NOAA SST. The determination coefficient is 0.97 and root mean square error is $1.05{\sim}1.24^{\circ}C$. Second, the SST distribution of Landsat-7 estimated by linear regression equation showed $12{\sim}13^{\circ}C$ in winter, $13{\sim}19^{\circ}C$ in spring, and $24{\sim}29^{\circ}C$ and $16{\sim}24^{\circ}C$ in summer and fall. The difference of between SST and thermal effluents temperature is $6{\sim}8^{\circ}C$ except for the summer season. The difference of SST is up to $2^{\circ}C$ in August. There is hardly any dispersion of thermal effluents in August. When it comes to the spread range of thermal effluents, the rise range of more than $1^{\circ}C$ in the sea surface temperature showed up to 7.56km from east to west and 8.43km from north to south. The maximum spread area was $11.65km^2$. It is expected that the findings of this study will be used as the foundational data for marine environment monitoring on the area around the nuclear power plant.

지난 10년(2000-2010)간 촬영된 Landsat-7 ETM+ 영상을 이용하여 동해남부에 위치한 고리원자력발전소 주변해역의 해표면 온도와 온배수의 계절 변동을 조사하였다. 그리고 조류와 조석 자료를 분석하여 온배수의 확산범위를 살펴보았다. 먼저 Landsat-7 ETM+ DN값과 NOAA AVHRR 해표면 수온을 이용한 1차 선형회귀분석을 통해 산출된 해표면 수온을 관측 수온과 비교 검증하였다. 그 결과 결정계수는 약 0.97 이상으로 높게 나타났으며, 평균제곱근 오차는 약 $1.05{\sim}1.24^{\circ}C$로 나타났다. 선형회귀분석식을 통해 산출된 Landsat-7 영상의 해표면 수온은 겨울철 $12{\sim}13^{\circ}C$, 봄철에는 $13{\sim}19^{\circ}C$, 여름과 가을철에는 $24{\sim}29^{\circ}C$, $16{\sim}24^{\circ}C$의 분포를 나타내었다. 방류 초기 온배수와 주변 해역과의 해표면 온도 차는 여름철을 제외하고는 $6{\sim}8^{\circ}C$의 차이를 보였으며, 여름철 8월에는 최대 $2^{\circ}C$정도 차이를 나타내었다. 온배수의 확산범위는 해표면 수온 $1^{\circ}C$ 이상의 상승 범위는 동서로 최대 7.56km, 남북으로는 8.43km로 나타났다. 확산면적은 최대 $11.65km^2$로 나타났다. 본 연구의 결과는 원자력 발전소 주변지역의 해양환경 모니터링을 위한 기초 자료로 활용할 수 있을 것이다.

Keywords

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