Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Development of Distributed Rainfall-Runoff Model Using Multi-Directional Flow Allocation and Real-Time Updating Algorithm (I) - Theory -

다방향 흐름 분배와 실시간 보정 알고리듬을 이용한 분포형 강우-유출 모형 개발(I) - 이론 -

  • Kim, Keuk-Soo (River, Coastal and Harbor Research Division, Korea Institute of Construction Technology) ;
  • Han, Kun-Yeun (Dept. of Civil Engrg., Kyungpook National Univ.) ;
  • Kim, Gwang-Seob (Dept. of Civil Engrg., Kyungpook National Univ.)
  • 김극수 (한국건설기술연구원 하천해안항만연구실) ;
  • 한건연 (경북대학교 공과대학 토목공학과) ;
  • 김광섭 (경북대학교 공과대학 토목공학과)
  • Published : 2009.03.31
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Abstract

In this study, a distributed rainfall-runoff model is developed using a multi-directional flow allocation algorithm and the real-time runoff updating algorithm. The developed model consists of relatively simple governing equations of hydrologic processes in order to apply developed algorithms and to enhance the efficiency of computational time which is drawback of distributed model application. The variability of topographic characteristics and flow direction according to various spatial resolution were analyzed using DEM(Digital Elevation Model) data. As a preliminary process using fine resolution DEM data, a multi-directional flow allocation algorithm was developed to maintain detail flow information in distributed rainfall-runoff simulation which has strong advantage in computation efficiency and accuracy. Also, a real-time updating algorithm was developed to update current watershed condition. The developed model is able to hold the information of actual behavior of runoff process in low resolution simulation. Therefore it is expected the improvement of forecasting accuracy and computational efficiency.

본 연구에서는 다방향 흐름 분배 알고리듬과 실시간 보정 알고리듬을 개발하여 분포형 강우-유출 모형에 적용하였다. 개발된 알고리듬의 적용과 분포형 모형 적용상의 약점인 계산시간 개선을 위해 비교적 간단한 수문과정 지배 방정식들을 이용하여 분포형 강우-유출 모형을 작성하였다. DEM(Digital Elevation Model)를 이용하여 공간해상도 변화에 따른 지형정보와 흐름정보의 변동성을 파악하였다. 모의수행 전처리 과정으로 가용한 고해상도 DEM 자료를 사용하여 공간해상도 변화에 따른 흐름정보의 손실을 최소화하고 상세흐름정보를 저해상도 흐름정보에 반영시키는 다방향 흐름분배 알고리듬을 개발하였다. 또한 실시간으로 유역상태량을 보정하는 실시간 보정 알고리듬을 개발하다. 개발된 모형은 저해상도 모의에서 유출 과정의 실제적 거동 정보를 유지할 수 있다. 그러므로 예측 정확도 향상 및 계산시간의 개선이 기대된다.

Keywords

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