Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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A study on PDSI improvement for drought monitoring: focused on the estimation method of potential evapotranspiration

가뭄감시를 위한 파머가뭄지수 개선 방안 연구: 잠재증발산량 산정 방법을 중심으로

  • Moon, Jang Won (Korea Institute of Civil Engineering and Building Technology) ;
  • Kang, Jae Won (SURI Engineering & Consulting Co., Ltd.) ;
  • Cho, Young Hyun (Hydrometeorological Cooperation Center, Korea Water Resources Corporation)
  • 문장원 (한국건설기술연구원 수자원.하천연구소) ;
  • 강재원 (수리이엔씨 SI사업본부) ;
  • 조영현 (한국수자원공사 수문기상협력센터)
  • Received : 2017.08.22
  • Accepted : 2017.10.27
  • Published : 2017.12.31
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Abstract

In this study, the effects of potential evapotranspiration method on drought index results were evaluated using SC-PDSI. Monthly heat index method, Penman-Monteith method, and Hargreaves equation were used as potential evapotranspiration method. SC-PDSI was calculated using three potential evapotranspiration method at 56 stations and compared the results. As a result, it was confirmed that the results by Penman-Monteith method and Hargreaves equation showed similar SC-PDSI calculation results without much difference, and the result by monthly heat index method showed a relatively large difference. It was confirmed that the results of SC-PDSI and drought situation judgment for the period of spring and winter season showed a big difference by the month. In conclusion, when calculating PDSI in Korea, using Penman-Monteith method and Hargreaves equation will be able to express the drought situation well.

본 연구에서는 SC-PDSI를 이용하여 잠재증발산량 산정 방법이 가뭄지수 산정 결과에 미치는 영향을 평가하였다. 잠재증발산량 산정 방법으로 월열지수법, Penman-Monteith 방법, Hargreaves 공식 등 세 가지 방법을 이용하였으며, 기상청 56개 지점을 대상으로 세 가지 잠재증발산량 산정 방법에 따른 SC-PDSI를 산정하고 그 결과를 비교하였다. 분석 결과, Penman-Monteith 방법에 의한 결과와 Hargreaves 공식에 의한 결과는 월별로 큰 차이 없이 유사한 가뭄지수 산정 결과를 나타내고 있음을 확인하였으며, 월열지수법에 의한 결과는 상대적으로 큰 차이를 보이고 있음을 알 수 있었다. 월별로는 봄철과 겨울철 기간에 대해 산정된 가뭄지수와 가뭄상황 판단 결과가 차이를 보이고 있음을 확인하였다. 결론적으로 우리나라에서 PDSI를 산정하고자 할 경우에는 Penman-Monteith 방법이나 Hargreaves 공식을 이용하는 것이 바람직할 것으로 판단된다.

Keywords

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