Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Evaluation of Forest Watershed Hydro-Ecology using Measured Data and RHESSys Model -For the Seolmacheon Catchment-

관측자료와 RHESSys 모형을 이용한 산림유역의 생태수문 적용성 평가 -설마천유역을 대상으로-

  • Shin, Hyung Jin (Integrated Water Management Research Team, K-water Institute, Korea Water Resources Corporation) ;
  • Park, Min Ji (Dept. of Civil and Environmental Engrg., Univ. of Massachusetts Amherst) ;
  • Kim, Seong Joon (Dept. of Civil and Environmental System Engrg., Konkuk Univ.)
  • 신형진 (한국수자원공사 K-water 연구원 수자원연구소) ;
  • 박민지 (메사츄세츠주립대학 토목환경공학과) ;
  • 김성준 (건국대학교 사회환경시스템공학과)
  • Received : 2012.04.10
  • Accepted : 2012.09.04
  • Published : 2012.12.31
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Abstract

This study is to evaluate the RHESSys (Regional Hydro-Ecological Simulation System) simulated streamflow (Q), evapotranspiration (ET), soil moisture (SM), gross primary productivity (GPP) and photosynthetic productivity (PSNnet) with the measured data. The RHESSys is a hydro-ecological model designed to simulate integrated water, carbon, and nutrient cycling and transport over spatially variable terrain. A 8.5 $km^2$ Seolma-cheon catchment located in the northwest of South Korea was adopted. The catchment covers 90.0% forest and the dominant soil is sandy loam. The model was calibrated with 2 years (2007-2008) daily Q at the watershed outlet and MODIS (Moderate Resolution Imaging Spectroradiometer) GPP, PSNnet and 3 year (2007～2009) daily ET data measured at flux tower using the eddy-covariance technique. The coefficient of determination ($R^2$) and the Nash-Sutcliffe model efficiency (ME) for Q were 0.74 and 0.63, and the average $R^2$ for ET and GPP were 0.54 and 0.93 respectively. The model was validated with 1 year (2009) Q and GPP. The $R^2$ and the ME for Q were 0.92 and 0.84, the $R^2$ for GPP were 0.93.

본 연구에서는 RHESSys (Regional Hydro-Ecologic Simulation System) 모형과 관측 자료를 이용하여 유출량, 증발산량, 토양수분량, 총일차생산량과 순광합성량을 평가하고자 한다. 수문생태모형인 RHESSys는물, 탄소 및 질소순환과 지형 공간적 변화에 따른 물질이동을 모의할 수 있다. 대상유역은 설마천 유역(8.5 $km^2$)으로 우리나라 북서쪽에 위치하고 있다. 유역의 90%이상이 산림유역이고, 토양은 대부분 사양토이다. 2007~2009년의 관측 일유출량을 이용하여 유출량을 검 보정하였고, 증발산량은 에디 공분산 방법에 의한 플럭스 타워로부터 관측되었으며 토양수분은 신뢰할 만한 실측자료를 바탕으로 모형의 보정(2007~2008) 및 검증(2009)을 실시하였다. 또한 지구의 탄소순환을 규명할 수 있는 식생의 순광합성량과 총일차생산량에 대한 모형의 검 보정은 Terra 위성의 MODIS (Moderate Resolution Imaging Spectroradiometer) 센서를 이용한 산출물인 순광합성량과 총일차생산량 자료를 바탕으로 모형의 보정(2007) 및 검증(2008)을 실시하였다. 모의 결과 보정기간 동안의 상관계수와 Nash-Sutcliffe 모형 효율은 유출량은 0.74와 0.63이었고, 증발산량과 총일차생산량의 상관계수는 각각 0.54와 0.93이었다. 모형 검정결과 유출량의 상관계수와 Nash-Sutcliffe 모형효율 각각 0.92와 0.84였으며, 총일차 생산량의 상관계수는 0.93이었다.

Keywords

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