Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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Assessment of Hydrological Impact by Long-Term Land Cover Change using WMS HEC-1 Model in Gyeongan-cheon Watershed

WMS HEC-1 모형을 이용한 경안천 유역의 경년 수문변화 분석

  • Lee, Jun-Woo (GIS Enterprising Center, Korea Institute of Construction Technology) ;
  • Kwon, Hyung-Joong (Department of Rural Engineering, Konkuk University) ;
  • Shin, Sha-Chul (Department of Civil Engineering, Andong National University) ;
  • Kim, Seong-Joon (Department of Rural Engineering, Konkuk University)
  • 이준우 (한국건설기술연구원 GIS사업단) ;
  • 권형중 (건국대학교 대학원 지역건설환경공학과) ;
  • 신사철 (안동대학교 토목환경공학과) ;
  • 김성준 (건국대학교 지역건설환경공학과)
  • Received : 2003.02.23
  • Accepted : 2003.03.24
  • Published : 2003.03.31
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Abstract

The purpose of this study is to assess the hydrological impact on a watershed from long-term land cover changes. Gyeongan-cheon watershed($558.2km^2$) was selected and WMS(watershed modeling system) HEC-1 model was adopted as an evaluation tool. To identify land cover changes, five Landsat images(1980/2/15, 1986/4/15, 1990/4/26, 1996/4/26, 2000/5/17) were selected and analyzed using maximum likelihood method. As a result, urban areas have increased by 5.6% and forest areas have decreased by 6.1% between 1980 and 2000. SCS curve number increased by 9.8. To determine model parameters and evaluate HEC-1 model, five storm events(1998/5/2, 1998/8/23, 1998/9/30, 1999/5/3, 2000/7/29) were used. The simulated stream flow agreed well with the observed one with relative errors ranging from 9% to 36%. For 254 mm daily rainfall of 30 years frequency, due to the increase of urban areas peak flow increased by $455m^3/sec$ and the time of peak flow reduced about four hours for 20 years land cover changes.

본 연구는 경안천 유역($558.2km^2$)을 대상으로 WMS의 HEC-1 모형을 이용하여 1980년~2000년 동안 토지피복변화에 따른 수문변화 분석을 수행하였다. 토지피복변화를 분석하기 위하여 다시기의 Landsat MSS(1980/2/15) 및 TM 위성영상(1986/4/15, 1990/4/26, 1996/4/26, 2000/5/17)을 이용하여 최대우도법을 실시하였다. 총 유역면적에 대하여 도시지역의 면적은 약 5.6% 증가하였으나, 산림지역은 6.1% 감소하였으며 SCS CN은 9.8 증가하였다. 모형의 매개변수 결정을 위하여 5개의 홍수사상(1998/5/2, 1998/8/23, 1998/9/30, 1999/5/3, 2000/7/29)을 대상으로 검 보정을 실시하였는바, 유출고에 있어 9~36%의 상대오차를 보였다. 30년 빈도의 일 최대강우 254mm를 적용하여 경년 수문변화를 분석한 결과 1986년~2000년 동안 첨두유출시간은 약 4시간 감소하였으며, 첨두유량은 $455m^3/sec$가 증가하였다.

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