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2024 Vol.57, Issue 11 Preview Page

Research Article

Comparative analysis of evaporation estimation formulas for long-term agricultural water resource management

장기 농업용수 분석을 위한 증발량 산정공식 비교분석

Beomgu Kima
,
Yeon Jeong Seongb
,
Innkyo Chooc
,
Yeong Uk Yud
,
Kyoung Jae Lime
,
Younghun Jungf*
김 범구a
,
성 연정b
,
추 인교c
,
유 영욱d
,
임 경재e
,
정 영훈f*
aPh.D Student, School of Advanced Science and Technology Convergence, Kyungpook National University, Sangju, Korea
bResearch Fellow, Sangju Carbon Neutrality Support Center, Sangju, Korea
cPh.D Student, School of Advanced Science and Technology Convergence, Kyungpook National University, Sangju, Korea
dPh.D Student, School of Advanced Science and Technology Convergence, Kyungpook National University, Sangju, Korea
eProfessor, Department of Regional Infrastructure Engineering, Kangwon National University, Chuncheon, Korea
fAssociate Professor, School of Advanced Science and Technology Convergence, Kyungpook National University, Sangju, Korea
a경북대학교 미래과학기술융합학부 박사과정
b상주시 탄소중립지원센터 연구위원
c경북대학교 미래과학기술융합학부 박사과정
d경북대학교 미래과학기술융합학부 박사과정
e강원대학교 지역건설공학과 교수
f경북대학교 미래과학기술융합학부 부교수
*Corresponding Author
30 November 2024. pp. 945-953
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Abstract

Accurate evapotranspiration estimation is critical for optimizing water resource management, agricultural planning, hydrological modeling, and climate adaptation. This study evaluates the performance of two evapotranspiration estimation formulas: the Hargreaves (HG) formula and the Penman-Monteith FAO (PM FAO) formula, utilizing meteorological data from 2017 to 2020 collected at eight sites within the Nakdong River basin. The analysis demonstrates that the PM FAO formula exhibits a superior correlation with observed monthly and daily average evapotranspiration rates compared to the HG formula. The MAE of the HG potential evapotranspiration was 1.81 mm/day, with a tendency for overestimation, particularly in the summer. In contrast, the Mean absolute error (MAE) of the PM FAO potential evapotranspiration was 1.26 mm/day, showing less error than the HG formula. Performance indices, such as NSE and R², further supported the "Good" rating for PM FAO across most study areas. Although the PM FAO formula requires extensive data, it offers more accurate potential evapotranspiration estimates. Thus, integrating the PM FAO formula into models used for agricultural and water resource management, where data availability permits, can significantly improve flow estimation accuracy, supporting better-informed decision-making for sustainable water resource management.

Keywords
Evaporation
Hargreaves
Penman-Monteith FAO
Agricultural water
Climate change

본 연구는 기후변화에 따른 농업용수 부족 문제를 해결하기 위해 증발산량 산정 공식을 비교 분석하였다. Hargreaves (HG) 공식과 Penman-Monteith FAO (PM FAO) 공식의 정확도와 적용 가능성을 평가하기 위해 낙동강 유역의 8개 지점에서 2017년부터 2020년까지의 기상자료를 사용하였다. 연구 결과, PM FAO 공식이 HG 공식에 비해 월평균 및 일평균 증발량과의 상관관계가 더 높게 나타났다. HG 잠재증발량의 평균 절대 오차는 1.81 mm/day로 산정되었으며 주로 여름철에 과대산정으로 인한 오차를 보였다. 반면, PM FAO 공식의 잠재증발량 평균 절대 오차는 1.26 mm/day로 Hargreaves 공식보다 적은 오차를 보였다. PM FAO 공식을 낙동강 지역에 적용한 결과 NSE, R2와 같은 평가지표는 ‘Good’ 등급의 평가지표가 나타남을 확인했다. PM FAO공식은 많은 데이터가 필요함에도 불구하고 더 나은 잠재 증발량을 산정할 수 있다. 데이터를 충분히 확보할 수 있는 경우 농업 및 수자원 관리 모델에 PM FAO 공식을 통합함으로써 흐름 추정의 정확성을 높일 수 있을 것이다. 또한 지속 가능한 수자원 관리를 위한 정확한 의사 결정에 기여할 수 있을 것으로 판단된다.

키워드
증발량
Hargreaves
Penman-Monteith FAO
농업용수
기후변화
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 57
  • No :11
  • Pages :945-953
  • Received Date : 2024-08-08
  • Revised Date : 2024-10-17
  • Accepted Date : 2024-11-06
  • DOI :https://doi.org/10.3741/JKWRA.2024.57.11.945
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