Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Sampling Error of Areal Average Rainfall due to Radar Partial Coverage

부분적 레이더 정보에 따른 면적평균강우의 관측오차

  • Yoo, Chul-Sang (Department of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Ha, Eun-Ho (Department of Information and Statistics, College of Liberal Arts and Sciences, Yonsei University) ;
  • Kim, Byoung-Soo (Dohwa Consulting Engineers Co., LTD.) ;
  • Kim, Kyoung-Jun (Department of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Choi, Jeong-Ho (Department of Civil, Environmental and Architectural Engineering, Korea University)
  • 유철상 (고려대학교 건축.사회환경공학과) ;
  • 하은호 (연세대학교 정보통계학과) ;
  • 김병수 (도화종합기술공사 수자원 1부) ;
  • 김경준 (고려대학교 건축.사회환경공학과) ;
  • 최정호 (고려대학교 건축.사회환경공학과)
  • Published : 2008.05.25
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Abstract

This study estimated the error involved in the areal average rainfall derived from incomplete radar information due to radar partial coverage of a basin or sub-basin. This study considers the Han-River Basin as an application example for the rainfall observation using the Ganghwa rain radar. Among the total of 20 mid-sized sub-basins of the Han-River Basin evaluated in this study, only five sub-basins are fully covered by the radar and three are totally uncovered. Remaining 12 sub-basins are partially covered by the radar to result in incomplete radar information available. When only partial radar information is available, the sampling error decreases proportional to the size of the radar coverage, which also varies depending on the number of clusters. Conditioned that the total area coverage remains the same, the sampling error decreases as the number of clusters increases. This study estimated the sampling error of the areal average rainfall of partially-covered mid-sized sub-basins of the Han- River Basin, and the results show that the sampling error could be at least several % to maximum tens % depending on the relative coverage area.

본 연구에서는 차폐 등을 이유로 레이더 강우가 대상 유역 또는 소유역을 완전하게 포괄하지 못하는 경우에 대해 가용한 레이더 강우를 이용하여 면적평균강우를 산정하는 경우에 포함될 수 있는 오차의 규모를 추정하였다. 본 연구는 한강 유역의 강우관측에 강화 레이더를 이용하는 경우를 적용 예로 살펴보았다. 한강 유역을 수자원단위지도의 중권역에 해당하는 총 20개의 소유역으로 나누어 검토할 경우, 총 소유역 중 강화 레이더로 완전히 관측되는 경우는 총 5개에 불과하며, 전혀 관측되지 않는 소유역도 3개가 있다. 나머지 12개의 소유역은 부분적인 레이더 정보만이 가용한 경우가 된다. 부분적인 레이더 정보만이 존재하는 경우의 관측오차는 기본적으로 관측되는 부분의 면적에 반비례하여 작아지지만, 동일한 면적일 경우에는 관측되는 면적이 몇 개로 쪼개져 있느냐에 따라 오차의 규모가 달라지게 된다. 동일한 관측면적일 경우에는 많이 쪼개져 있을수록 관측오차가 작아지게 된다. 본 연구의 대상유역인 한강유역의 경우에도 강화 레이더 강우자료를 이용하여 면적평균강우를 추정한다면 그 오차는 최소 수 %에서 최대 수십%까지 범위인 것으로 파악되었다.

Keywords

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