Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Bright band detection using X-band polarimetric radar

X-밴드 이중편파 레이더에 의한 밝은 띠 탐지

  • Lee, Dong-ryul (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Jang, Bong-joo (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Hwang, Seok Hwan (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Noh, Hui-seong (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology)
  • 이동률 (한국건설기술연구원 국토보전연구본부) ;
  • 장봉주 (한국건설기술연구원 국토보전연구본부) ;
  • 황석환 (한국건설기술연구원 국토보전연구본부) ;
  • 노희성 (한국건설기술연구원 국토보전연구본부)
  • Received : 2020.06.02
  • Accepted : 2020.10.28
  • Published : 2020.12.31
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Abstract

This research detects the features of the bright band (BB) through analysis of the vertical profile of range height indicator (RHI) and the slant range beam profile of plane position indicator (PPI) of the polarimetric radar measurements-horizontal reflectivity (ZH), differential reflectivity (ZDR), and cross-correlation coefficient (ρHV). As a result of the analysis, it is possible to clearly detect the bright band using the polarimetric radar measurements, and it is confirmed that the result is consistent by double searching for the BB using the RHI and PPI scan data at the same time. Based on these results, the accuracy of QPE (quantification of precipitation estimation) can be improved by applying the BB search method by the PPI slant range in this research to large rainfall radars that only scan PPI volumes in the field without RHI observations.

본 연구에서는 소형 X-밴드 이중편파 레이더의 수평반사도 (ZH), 차등반사도(ZDR), 교차상관계수(ρHV)의 RHI(range height indicator) 연직단면과 PPI (plan position indicator)의 고도각 경사거리(slant range) 빔의 프로파일 분석을 통하여 밝은 띠(bright band, BB)의 특성을 탐색하였다. 분석 결과, X-밴드 레이더의 이중편파 변수들을 이용하여 밝은 띠 영역을 명확히 탐지할 수 있었으며, 동시간대의 RHI 및 PPI 관측 자료를 이용한 이중적인 밝은 띠 영역을 탐색하여 그 결과가 일치함을 확인하였다. 이 결과를 토대로 현업에서 RHI 관측없이 PPI 볼륨관측만 수행하는 대형 강우레이더에도 본 연구의 PPI 고도각 경사거리에 의한 BB 탐색 방법을 적용함으로써 QPE (quantification of precipitation estimation)의 정확성을 향상시킬 수 있다.

Keywords

Acknowledgement

본 결과물은 환경부의 재원으로 한국환경산업기술원의 물 관리연구사업의 지원을 받아 연구되었습니다(127557).

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