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2020 Vol.53, Issue 7 Preview Page

Research Article

Runoff assessment using radar rainfall and precipitation runoff modeling system model

레이더 강수량과 PRMS 모형을 이용한 유출량 평가

Tae-Jeong Kima
,
Sung-Hoon Kimb
,
Sung-Ho Leec
,
Chang-Sung Kimd
,
Hyun-Han Kwone*
김 태정a
,
김 성훈b
,
이 성호c
,
김 창성d
,
권 현한e*
aAssociate Researcher, Research & Development Division, Korea Institute of Hydrological Survey
bPrincipal Researcher, Research & Development Division, Korea Institute of Hydrological Survey
cAssociate Researcher, Research & Development Division, Korea Institute of Hydrological Survey
dSenior Researcher, Research & Development Division, Korea Institute of Hydrological Survey
eProfessor, Department of Civil & Environmental Engineering, Sejong University
a한국수자원조사기술원 연구개발실 전임연구원
b한국수자원조사기술원 연구개발실 책임연구원
c한국수자원조사기술원 연구개발실 전임연구원
d한국수자원조사기술원 연구개발실 선임연구원
e세종대학교 공과대학 건설환경공학과 교수
* Corresponding Author
31 July 2020. pp. 493-505
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Abstract

The rainfall-runoff model has been generally adopted to obtain a consistent runoff sequence with the use of the long-term ground-gauged based precipitation data. The Thiessen polygon is a commonly applied approach for estimating the mean areal rainfall from the ground-gauged precipitation by assigning weight based on the relative areas delineated by a polygon. However, spatial bias is likely to increase due to a sparse network of the rain gauge. This study aims to generate continuous runoff sequences with the mean areal rainfall obtained from radar rainfall estimates through a PRMS rainfall-runoff model. Here, the systematic error of radar rainfall is corrected by applying the G/R Ratio. The results showed that the estimated runoff using the corrected radar rainfall estimates are largely similar and comparable to that of the Thiessen. More importantly, one can expect that the mean areal rainfall obtained from the radar rainfall estimates are more desirable than that of the ground in terms of representing rainfall patterns in space, which in turn leads to significant improvement in the estimation of runoff.

Keywords
Rainfall-runoff model
Area average rainfall
Thiessen polygon
Weather radar
Runoff analysis

현재 유역단위 수문해석을 목적으로 장기간 자료 확보가 용이하고 신뢰도가 확보된 지상관측소 강수량 자료를 강우-유출 모형을 활용하여 유출량을 평가하고 있다. 지상관측소 강수량 자료를 이용하여 면적평균 강수량을 산정하는데 있어 일반적으로 지상관측소의 위치 정보를 바탕으로 Thiessen 다각형법을 널리 이용하고 있으나 지상관측소의 공간적 편중으로 인해 면적평균 강수량 산정과정에서 제약이 있다. 본 연구에서는 시공간적으로 연속적인 강수량 관측이 가능한 기상레이더 자료를 이용하여 유역단위 면적평균 강수량을 산정하고 이를 PRMS 모형의 입력 자료로 활용하여 유출량을 평가하였다. 세부적으로 레이더 강수량의 편의 오차를 해결하기 위하여 G/R Ratio 기법을 적용하여 유역별로 레이더 강수량을 보정하였다. 레이더 강수량을 이용한 유출특성은 Thiessen 면적강수량을 이용한 유출의 통계적 특성을 현실적으로 재현하였다. 지상 관측소에 의존하여 생산하는 Thiessen 면적강수량에 비하여 레이더 강수량을 활용하는 것이 유역에 발생하는 강수의 공간적 특성을 효과적으로 반영하는 것으로 사료되며 향후 수문해석에서 정확도를 확보한 유출량을 제시할 것으로 판단된다.

키워드
강우-유출 모형
면적평균 강수량
Thiessen 다각형
기상레이더
유출해석
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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 :7
  • Pages :493-505
  • Received Date : 2020-04-07
  • Revised Date : 2020-05-13
  • Accepted Date : 2020-05-13
  • DOI :https://doi.org/10.3741/JKWRA.2020.53.7.493
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