Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Development of Distributed Ecohydrologic Model and Its Application to the Naeseong Creek Basin

분포형 생태수문모형 개발 및 내성천 유역에의 적용

  • Choi, Daegyu (Pukyong National University, Institute of Environmental and Marine Science, Daeyeon Campus) ;
  • Kim, In-Hwan (Pukyong National University, Department of Spatial Information Engineering, Daeyeon Campus) ;
  • Kim, Jeongsook (Dongseo University, Division of Energy and Bio-Engineering, Dongseo University) ;
  • Kim, Sangdan (Pukyong National University, Department of Environmental Engineering, Daeyeon Campus)
  • 최대규 (부경대학교 환경연구소) ;
  • 김인환 (부경대학교 공간정보시스템 공학과) ;
  • 김정숙 (동서대학교 에너지생명공학부) ;
  • 김상단 (부경대학교 환경공학과)
  • Received : 2013.06.25
  • Accepted : 2013.09.22
  • Published : 2013.11.30
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Abstract

Distributed ecohydrological model which can simulate hydrological components, vegetation and landsurface temperature using practically available input and observed data with minimum parameters is introduced. This model is designed to properly simulate in area with lack of observed data. Parameter estimation and calibration of the model can be carried out with indirectly estimated data (monthly surface runoff by NRCS-CN method and annual actual vaporization by empirical equation) and remote sensing data (NDVI, LST) instead of observed data. We applied this model in the Naeseong creek basin to evaluate the model validity. Firstly, we found the sensitive parameters which largely influence the simulation results by sensitivity analysis, and then hydrological components, vegetation, land-surface temperature, routed streamflow and water temperature were simulated over 10 years (2001 to 2010) using calibrated parameters. Parameters are estimated by optimization method. It is shown that most of grids are well simulated. In the case of streamflow and water temperature, we checked two observed points in the outlet of watershed and it is shown that streamflow and water temperature are properly simulated as well. Hence, it can be shown that this model properly simulate the hydrological components, vegetation, land-surface temperature, routed streamflow and water temperature as well, even though in despite of using limited input data and minimum parameters.

본 논문에서 소개되는 분포형 생태수문모형은 현실적으로 확보 가능한 입력자료와 최소한의 매개변수를 이용하여 유역의 수문, 식생, 지표온도를 모의하는 모형이다. 개발된 모형은 내성천 유역에 대해 적용하여 모형의 활용가능성을 살펴보았다. 우선적으로 매개변수에 대해 민감도 분석을 실시하여 모의결과에 많은 영향을 주는 매개변수를 선별해보았으며 이후 최적화 기법을 통해 모형의 매개변수를 추정하여 내성천 유역의 최근 10년간(2001~2010)의 수문, 식생, 지표온도 그리고 추적(routing)을 통한 하천유량 및 하천수온을 모의하였다. 최적화 기법을 통해 추정자료를 이용하여 매개변수를 추정하였으며 일부 격자를 제외한 대다수의 격자에서 적절히 모의된 것을 확인하였다. 하천유량 및 하천수온의 경우 단위 유역 말단 두 지점에 대해 검증을 실시하였으며 하천유량 및 하천수온 적절히 모의된 것을 확인할 수 있었다. 실제 유역인 내성천 유역을 대상으로 분포형 생태수문모형이 최소한(현실적으로 확보 가능한)의 입력자료와 매개변수를 이용함에도 불구하고 유역 수문순환 및 식생을 적절히 설명하고 있음을 살펴볼 수 있다.

Keywords

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