Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Application of land cover and soil information for improvement of HSPF modeling accuracy

HSPF 예측 정확도 제고를 위한 토지피복 및 토양 특성 자료의 활용

  • Kang, Yooeun (Department of Environmental & IT Engineering, Chungnam National University) ;
  • Kim, Jaeyoung (Department of Environmental Engineering, Chungnam National University) ;
  • Seo, Dongil (Department of Environmental Engineering, Chungnam National University)
  • 강유은 (충남대학교 환경IT융합공학과) ;
  • 김재영 (충남대학교 환경공학) ;
  • 서동일 (충남대학교 환경공학)
  • Received : 2022.09.02
  • Accepted : 2022.10.02
  • Published : 2022.10.31
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Abstract

This study aims to improve the runoff modeling accuracy of a basin using Hydrological Simulation Program-FORTRAN (HSPF) model by considering nonhomogeneous characteristics of a basin. By entering classified values according to the various types of land cover and soil to the parameters in HSPF-roughness coefficient (NSUR), infiltration (INFILT), and evapotranspiration (LZETP)- the heterogeneity of the Yongdam Dam basin was reflected in the model. The results were analyzed and compared with the one where the parameters were set as a single value throughout the basin. The flow rate and water quality simulation results showed improved results when classified parameters were used by land cover and soil type than when single values were used. The parameterization changed not only the flow rate, but also the composition ratio of each hydrologic components such as surface runoff, baseflow, and evapotranspiration, which shows the impact of the value set to a parameter on the entire hydrological process. This implies the importance of considering the heterogeneous characteristics of the land cover and soil of the basin when setting the parameters in a model.

HSPF (Hydrological Simulation Program-Fortran)는 미국과 우리나라에서 특히 많이 사용하는 유역 수문 및 수질 모델이다. 이 모델은 분산형 모델로서 각 유역의 지형, 지질 및 오염부하특성을 정확하게 반영하는 것이 매우 중요하다. 본 연구에서는 HSPF의 매개변수 중 조도계수(NSUR), 침투(INFILT), 토양 하부의 증발산(LZETP)에 대하여 실제 용담댐 유역의 토지피복과 토양의 종류에 따라 값을 차등 입력함으로써 단일 값을 입력했을 때에 대비하여 유량, 수문 성분 및 수질의 정확도 향상 여부를 분석하였다. 조도계수와 식물의 밀도를 의미하는 토양 하부의 증발산은 토지피복의 종류에 따라 입력하였고, 침투는 유역의 수문학적 토양 그룹의 분포에 따라 입력하였다. 분석 결과 유량과 수질은 단일 값을 입력했을 때보다 각 매개변수를 토지피복과 토양의 종류별로 차등 설정하였을 때 정확도가 향상되는 것으로 나타났다. 또한, 조도계수(NSUR) 입력에 의해 지표유출과 첨두유량이 증가하였고, 침투(INFILT) 입력에 의해 기저유출이 감소하고 지표유출이 증가하였으며, 증발산(LZETP) 차등 입력으로 중간유출과 지표유출이 증가하고 지하수유출이 감소하는 등 각 매개변수의 설정이 유역 말단의 유량뿐 아니라 모든 수문 성분의 구성 비율에 영향을 미친다는 것을 확인하였다. 이러한 결과는 유역의 토지피복 및 토양의 비균질한 특성을 정확하게 표현하는 것이 이 모델을 이용한 유량 및 수질 예측의 정확도 제고에 중요하다는 것을 시사한다.

Keywords

Acknowledgement

본 성과는 환경부의 재원을 지원받아 한국환경산업기술원 "신기후체제 대응 환경기술개발산업"의 연구개발을 통해 창 출되었습니다(RE202201636).

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