Bright band detection using X-band polarimetric radar

Dong-ryul Lee; Bong-joo Jang; Seok Hwan Hwang; Hui-seong Noh

doi:10.3741/JKWRA.2020.53.12.1211

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2020 Vol.53, Issue 12 Preview Page

Research Article

Bright band detection using X-band polarimetric radar X-밴드 이중편파 레이더에 의한 밝은 띠 탐지

31 December 2020. pp. 1211-1220

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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 (Z_H), differential reflectivity (Z_DR), 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.

Keywords

X-band polarimetric radar

Radar rainfall

Bright band

Range height indicator (RHI)

Plane position indicator (PPI)

본 연구에서는 소형 X-밴드 이중편파 레이더의 수평반사도 (Z_H), 차등반사도(Z_DR), 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.

키워드

X-밴드 이중편파 레이더

레이더강우

밝은 띠

RHI

PPI

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Information

Publisher :KOREA WATER RESOURECES ASSOCIATION
Publisher(Ko) :한국수자원학회
Journal Title :Journal of Korea Water Resources Association
Journal Title(Ko) :한국수자원학회 논문집
Volume : 53
No :12
Pages :1211-1220
Received Date : 2020-06-02
Revised Date : 2020-10-28
Accepted Date : 2020-10-28
DOI :https://doi.org/10.3741/JKWRA.2020.53.12.1211

Journal of Korea Water Resources Association ISSN:2799-8746(Print) 2799-8754(Online) 한국수자원학회 논문집

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