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Evaluation of Rainfall Measurement Capability of Dual Polarization Radar

이중편파 레이더의 강우관측 능력 평가

  • 전병국 (서울시립대학교 도시공학과) ;
  • 이충기 (한강홍수통제소 하천정보센터) ;
  • 김양수 (한강홍수통제소 하천정보센터)
  • Received : 2012.03.21
  • Accepted : 2012.04.05
  • Published : 2012.04.30

Abstract

The information of areal rainfall distribution is very important for the flood forecasting, flood management, and dam operation, etc. In analyzing of spatial distribution of rainfall, the rain radar is superior to the point rain gauge network and has been used for flood managements in many countries. In Korea the rain radar is used for rainfall estimation and recently 'Ministry of Land, Transportation and Maritime Affairs' is operating the first dual polarization rain radar at Mt. Bisl, Daegu. In this study the applicable feasibility of dual polarization rain radar to flood forecasting was reviewed through evaluation of rainfall measurement capability, comparing to the conventional single polarization radar, for major heavy rain events occurred within Nakdong river basin in 2011. As a results the mean observational error, comparing to the surface rain gauge as ground truth, by dual polarization radar was decreased about 13% from the one of single polarization radar. From the study the feasibility of radar rainfall to improving flood forecasting accuracy was revealed.

홍수예보, 댐 운영 등 홍수관리를 위해서는 강우의 공간분포 파악이 중요하다. 강우레이더는 점 우량계 관측망보다 강우의 공간적 분포를 파악하는데 효과적이어서 많은 나라에서 홍수관리에 활용중이다. 우리나라도 레이더를 이용하여 강우량을 추정하고 있으며, 최근에는 국토해양부에서 우리나라 최초로 대구 비슬산에 이중편파 강우레이더를 설치하여 현재 운영 중에 있다. 본고에서는 2011년 낙동강 유역의 주요 호우를 대상으로 이중편파레이더의 강우관측 능력을 기존의 단일편파 레이더와 비교평가 하고 홍수예보에의 적용성을 검토하였다. 그 결과 지상우량계를 기준으로 이중편파 강우레이더의 관측오차가 기존의 단일편파 보다 약 13%정도 감소되는 것으로 나타나 홍수예보 정확도 제고에 기여할 수 있음을 확인하였다.

Keywords

References

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