Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Development of Radar Polygon Method : Areal Rainfall Estimation Technique Based on the Probability of Similar Rainfall Occurrence

Radar Polygon 기법의 개발 : 유사강우발생 확률에 근거한 면적강우량 산정기법

  • Cho, Woonki (Department of Civil Engineering, Hongik University) ;
  • Lee, Dongryul (Center of Disaster Research and Hydrologic Data Center Using Radar Measurement, Korea Institute of Construction Technology) ;
  • Lee, Jaehyeon (Department of Civil Engineering, Hongik University) ;
  • Kim, Dongkyun (Department of Civil Engineering, Hongik University)
  • 조운기 (홍익대학교 토목공학과) ;
  • 이동률 (한국건설기술연구원 수문레이더 재해연구.데이터센터) ;
  • 이재현 (홍익대학교 토목공학과) ;
  • 김동균 (홍익대학교 토목공학과)
  • Received : 2015.09.03
  • Accepted : 2015.09.21
  • Published : 2015.11.30
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Abstract

This study proposed a novel technique, namely the Radar Polygon Method (RPM), for areal rainfall estimation based on radar precipitation data. The RPM algorithm has the following steps: 1. Determine a map of the similar rainfall occurrence of which each grid cell contains the binary information on whether the grid cell rainfall is similar to that of the observation gage; 2. Determine the similar rainfall probability map for each gage of which each grid cell contains the probability of having the rainfall similar to that of the observation gage; 3. Determine the governing territory of each gage by comparing the probability maps of the gages. RPM method was applied to the Anseong stream basin. Radar Polygons and Thiessen Polygons of the study area were similar to each other with the difference between the two being greater for the rain gage highly influenced by the orography. However, the weight factor between the two were similar with each other. The significance of this study is to pioneer a new application field of radar rainfall data that has been limited due to short observation period and low accuracy.

본 연구에서는 실측자료를 기반으로 한 새로운 면적강우량 산정기법인 '레이더 폴리곤 기법(Radar polygon Method, PRM)'을제시하였다. RPM은(1) 강우공간분포의 실측자료인 기상레이더 자료를 이용하여 지점관측소가 위치한 곳에서의 강우강도와 주변지역의 강우강도를 비교하여 유사강우 발생지도 작성; (2) 위의 단계를 관측소별로 반복하여 각 관측소별 유사강우 발생 확률 지도 작성; (3) 주어진 격자에서의 각 관측소의 유사강우 발생 확률의 비교를 통한 지배범위 결정의 알고리즘으로 관측소별 가중치를 결정하는 방법이다. RPM 방법을 안성천 유역에 적용하여 Thiessen법과 결과를 비교하였다. 안성천 유역의 경우 RPM과 Thiessen방법에 근거한 다각형의 공간적 형태는 관측소 위치의 강우 특성에 따라 차이를 보였으나 관측소별 가중치 값의 차이는 크지 않았다. 본 연구는 관측기간 및 정확도의 문제로 인하여 제한적으로 활용되어 온 레이더 강우관측자료의 새로운 활용분야를 개척하였다는 점에서 큰 의미를 찾을 수 있다.

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References

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