KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Assessment of MODIS Leaf Area Index (LAI) Influence on the Penman-Monteith Evapotranspiration of SLURP Model

MODIS 위성영상으로부터 추출된 엽면적지수(LAI)가 SLURP 모형의 Penman-Monteith 증발산량에 미치는 영향 평가

  • 하림 (건국대학교 사회환경시스템공학과) ;
  • 신형진 (건국대학교 사회환경시스템공학과) ;
  • 박근애 (건국대학교 사회환경시스템공학과) ;
  • 김성준 (건국대학교 사회환경시스템공학과)
  • Received : 2008.05.07
  • Accepted : 2008.07.30
  • Published : 2008.09.30
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Abstract

Evapotranspiration (ET) is an important state variable while simulating daily streamflow in hydrological models. In the estimation of ET, for example, when using FAO Penman Monteith equation, the LAI (Leaf Area Index) value reflecting the conditions of vegetation generally affects considerably. Recently in evaluating the vegetation condition as a fixed quantity, the remotely sensed LAI from MODIS satellite data is available, and the time series values of spatial LAI coupled with land use classes are utilized for ET evaluation. Four years (2001-2004) of MODIS LAI was prepared for the evaluation of Penman Monteith ET in the continuous hydrological model, SLURP (Semi-distributed Land Use-based Runoff Processes). The model was applied for simulating the dam inflow of Chungju watershed ($6661.3km^2$) located in the upstream of Han river basin. For four years (2001-2004) dam inflow data and meteorological data, the model was calibrated and verified using MODIS LAI data. The average Nash-Sutcliffe model efficiency was 0.66. The 4 years watershed average Penman Monteith ETs of deciduous, coniferous, and mixed forest were 639.1, 422.4, and 631.6 mm for average MODIS LAI values of 3.64, 3.50, and 3.63 respectively.

수문 모형을 이용한 일 유출모의에 있어 증발산량은 중요한 변수로 명시되고 있다. 증발산량 추정에 있어서는 예를 들어, FAO Penman Monteith 공식을 이용할 경우 식생의 상태를 잘 반영하는 LAI(엽면적지수) 같은 인자는 상당한 영향을 미친다. 최근에는 고정된 양으로 식생 상태를 추정하는 데 있어, 원격탐사 기법을 이용한 MODIS 위성영상 자료로부터 추정된 LAI를 이용하고 있으며, 시계열 LAI 공간자료는 토지피복도와 함께 증발산량 추정을 위해 활용된다. 본 연구에서는 한강 상류부에 위치한 충주댐 유역($6661.3km^2$)의 댐 유입량을 모의하기 위해 SLURP 수문 모형을 적용하였으며, FAO Penman Monteith 공식을 통한 증발산량 추정에 식생인자가 미치는 영향을 분석하기 위해 4년(2001년-2004년) 동안의 MODIS LAI 자료를 구축하였다. 4년 동안의 9개 기상관측소 지점 기상자료 및 댐 유입량 자료와 MODIS LAI 자료를 기반으로 모델 보정(2001년, 2003년) 및 검증(2002년, 2004년)을 실시 한 결과, 평균 Nash-Sutcliffe 모델 효율 계수는 0.66이었다. 유역의 활엽수림, 침엽수림 그리고 혼효림에서의 4년 평균 MODIS LAI가 각각 3.64, 3.50, 그리고 3.63이었으며, 이에 따른 Penman Monteith ET는 639.1, 422.4, 그리고 631.6 mm로 모의되었다.

Keywords

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