KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Effect of Areal Mean Rainfall Estimation Technique and Rainfall-Runoff Models on Flood Simulation in Samcheok Osipcheon(Riv.) Basin

면적 강우량 산정 기법과 강우-유출 모형이 삼척오십천 유역의 홍수 모의에 미치는 영향

  • 이현지 (강원대학교 도시환경재난관리전공) ;
  • 신영섭 ((주)동진이엔시) ;
  • 강동호 (강원대학교 AI 기후재난기술융합연구소) ;
  • 김병식 (강원대학교 AI소프트웨어학과/방재전문대학원)
  • Received : 2023.10.25
  • Accepted : 2023.11.06
  • Published : 2023.12.01
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Abstract

In terms of flood management, it is necessary to analyze quantitative rainfall and runoff from a spatial and temporal perspective and to analyze runoff for heavy rainfall events that are concentrated within a short period of time. The simulation and analysis results of rainfall-runoff models vary depending on the type and input data. In particular, rainfall data is an important factor, so calculating areal mean rainfall is very important. In this study, the areal mean rainfall of the Samcheok Osipcheon(Riv.) watersheds located in the mountainous terrain was calculated using the Arithmetic Mean Method, Thiessen's Weighting Method, and the Isohyetal Method, and the rainfall-runoff results were compared by applying the distributional model S-RAT and the lumped model HEC-HMS. The results of the temporal transferability study showed that the combination of the distributional model and the Isohyetal Method had the best statistical performance with MAE of 64.62 m3/s, RMSE of 82.47 m3/s, and R2 and NSE of 0.9383 and 0.8547, respectively. It is considered that this study was properly analyzed because the peak flood volume occurrence time of the observed and simulated flows is within 1 hour. Therefore, the results of this study can be used for frequency analysis in the future, which can be used to improve the accuracy of simulating peak flood volume and peak flood occurrence time in mountainous watersheds with steep slopes.

홍수관리 측면에선 시공간 관점의 정량적인 강우·유출 해석과 단기간 내 집중되는 강우사상에 대한 유출 해석이 필요하다. 강우-유출 모형은 종류와 입력자료에 따라 모의·해석 결과가 달라진다. 특히 강우자료는 중요한 요소이기 때문에 면적 강우량 산정 기법이 매우 중요하다. 본 연 구는 산악지형에 위치한 삼척오십천 유역의 면적 강우량을 산술평균법, 티센 가중법 그리고 등우선법을 이용하여 산정하였으며, 분포형 모형인 S-RAT과 집중형 모형인 HEC-HMS에 적용하여 각 강우 유출 결과를 비교했다. 시간 전이성 검토 결과 분포형 모형과 등우선법 조합이 MAE 64.62 m3/s, RMSE 82.47 m3/s로 통계 성능이 가장 우수하였고, R2 와 NSE도 각각 0.9383, 0.8547로 높게 나왔다. 본 연구는 관측 유량과 모의 유량의 첨두홍수량 발생 시간이 1시간 이내이므로 적절하게 분석되었다고 판단된다. 따라서 연구 결과는 향후 빈도 해석에 활용할 수 있으며, 이를 토대로 경사가 급한 산악지형의 유역에 첨두홍수량 및 첨두홍수 발생 시간 모의 정확도를 개선할 수 있을 것으로 사료된다.

Keywords

Acknowledgement

This research was supported by a grant(2023-MOIS35-006 (RS-2023-00244860)) of Policy-linked Technology Development Program on Natural Disaster Prevention and Mitigation funded by Ministry of Interior and Safety(MOIS, Korea).

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