KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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MODIS DSI for Evaluation of the Local Drought Events in Korea

우리나라의 지역 가뭄 평가를 위한 MODIS DSI 활용

  • 박혜선 (연세대학교 토목환경공학과) ;
  • 엄명진 (연세대학교 토목환경공학과) ;
  • 김정빈 (연세대학교 토목환경공학과) ;
  • 김연주 (연세대학교 토목환경공학과)
  • Received : 2015.07.17
  • Accepted : 2015.09.10
  • Published : 2015.12.01
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Abstract

As the drought disasters are increased in the world, the need of study using satellite image data is on the rise. This study is conducted to analyze the drought in the region using satellite image, and to analyze the correlation with the standard precipitation index (SPI) and the actual drought cases. We selected Dongducheon and Taebaek region for domestic major drought (2001, 2008-2009). The correlation with the SPI and the observed water level data was analyzed using the $0.05^{\circ}$ spatial resolution and 8days MODIS DSI (Drought Severity Index). In Dongducheon, 6-months DSI has a correlation of 0.71 with the SPI (30). In Taebaek, the correlation between 6-months DSI and SPI (90) was a 0.40 and showed an average hit ratio of 65.7% in comparing with the observed water level of study area. In summary, this study showed a limited correlation between DSI based on satellite images and meteorological drought index SPI and confirmed the possibility of using DSI for the domestic study.

전 세계적으로 가뭄 재해가 증가함에 따라 최근 위성영상 자료를 활용한 연구의 필요성이 대두되고 있다. 기존 연구는 대부분 실제 사례와의 연계성이 낮다는 한계점을 가지고 있다. 본 연구에서는 위성영상을 활용하여 지역적 분석을 실시하고, 영상 자료와 표준강수지수(SPI) 및 실제 가뭄 사례의 상관성 분석을 실시하고자 하였다. 국내 주요 가뭄(2001년, 2008-2009년)을 대상으로 각각 동두천과 태백 지역을 선정하였다. 8일 간격의 $0.05^{\circ}$ 공간해상도 MODIS DSI (Drought Severity Index)를 이용하여 SPI 및 수위 자료와의 상관관계 분석을 실시하였다. 동두천의 경우 6개월 DSI는 30일 SPI와 0.71의 상관관계를 나타냈으며, 태백 지역의 6개월 DSI와 90일 SPI의 상관성은 0.40을 보였다. DSI와 대상지역의 관측 저수위를 비교한 결과 6개월 DSI가 평균 65.7% 수준의 적중률을 보였다. 연구를 통하여 위성영상 자료 기반 가뭄지수인 DSI와 기상학적 가뭄지수인 SPI의 상관성을 부분적으로 제시할 수 있었으며, 실제 관측 자료와 비교를 실시한 결과 국내 연구에서의 활용 가능성을 확인하였다.

Keywords

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