Evaluation of Accuracy of the Physics Based Distributed Hydrologic Model Using VfloTM Model

VfloTM 모형을 이용한 물리기반의 분포형 수문모형의 정확성 평가

  • 홍준범 (한국건설기술연구원 수자원연구부) ;
  • 김병식 (한국건설기술연구원 수자원연구부) ;
  • 윤석영 (한국건설기술연구원 수자원연구부)
  • Received : 2006.06.14
  • Accepted : 2006.09.23
  • Published : 2006.11.29


In this study, a fully distributed physical-based rainfall-runoff model called Vflo$^{TM}$ is applied to Junglang-cheon basin for simulating runoff. Geo-spatial data are used to parameterize the model to account for the characteristics of soils, landuse/cover, and topograph. 300m resolution DEM is used to compute slope and drainage network connectivity. Spatially distributed rainfall data is interpolated by ordinary kriging method. In this study, hydrograph from HEC-HMS and Vflo$^{TM}$ without/with calibration of parameters was compared to evaluate the accuracy of rainfall-runoff model From the results, a fully distributed physical-based rainfall-runoff model reproduce the peak time and shape of hydrograph much better than HEC-HMS.

본 연구에서는 물리적 기반의 완전분포 모형인 Vflo$^{TM}$ 모형이 중랑천 유역의 유출량 모의를 위하여 사용되었다. 토양, 토지 피복, 지형 특성을 나타내는 매개변수를 입력하기 위하여 지형공간 자료가 사용되었으며 유역의 하천 배수망과 각 격자에서의 경사를 구하기 위하여 300m 격자 크기의 DEM을 사용하였고 강우의 공간적 분포 방법으로 크리깅 기법을 사용하였다. 본 연구에서는 강우-유출 모형의 정확성을 평가하기 위하여 매개변수의 보정을 하지 않은 HEC-HMS와 Vflo$^{TM}$ 모형의 유출 수문곡선을 비교하였으며, 이 결과 물리적 기반의 완전분포 모형이 매개변수 보정이 없는 경우 HEC-HMS에 비해 총 유출체적은 적게 나오는 반면 수문곡선의 형태는 관측 수문곡선과 비슷하게 모의되었다. 매개변수 보정 후에도 이와 마찬가지로 Vflo$^{TM}$ 모형이 HEC-HMS 보다 더 정확한 첨두시간과 수문 곡선의 형태를 나타내는 것으로 보아 충분한 사용성이 있음을 확인할 수 있었다.



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