Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Evaluation of Hydrometeorological Components Simulated by Water and Energy Balance Analysis

물수지와 에너지수지 해석에 따른 수문기상성분 평가

  • Ji, Hee Sook (Applied Meteorology Research Division, National Institute of Meteorological Research) ;
  • Lee, Byong Ju (Center of Atmospheric science & Earthquake Research) ;
  • Nam, Kyung Yeub (Applied Meteorology Research Division, National Institute of Meteorological Research) ;
  • Lee, Chul Kyu (Applied Meteorology Research Division, National Institute of Meteorological Research) ;
  • Jung, Hyun Sook (Applied Meteorology Research Division, National Institute of Meteorological Research)
  • 지희숙 (국립기상연구소 응용기상연구과 수문자원연구팀) ;
  • 이병주 (기상기술개발원) ;
  • 남경엽 (국립기상연구소 응용기상연구과) ;
  • 이철규 (국립기상연구소 응용기상연구과 수문자원연구팀) ;
  • 정현숙 (국립기상연구소 응용기상연구과)
  • Received : 2013.08.07
  • Accepted : 2013.11.11
  • Published : 2014.01.31
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Abstract

The objective of this study is to evaluate TOPLATS land surface model performance through comparison of results of water and energy balance analysis. The study area is selected Nakdong river basin and high resolution hydrometeorological components of which spatio-temporal resolution is 1 hr and 1 km are simulated during 2003 to 2013. The simulated daily and monthly depth of flows are well fitted with the observed one on Andong and Hapcheon dam basin. In results of diurnally analysis of energy components, change pattern throughout the day of net radiation, latent heat, sensible heat, and ground heat under energy balance analysis have higher accuracy than ones under water balance analysis at C3 and C4 sites. Especially, root mean square errors of net radiation and latent heat at C4 site are shown very low as 22.18 $W/m^2$ and 7.27 $W/m^2$, respectively. Mean soil moisture and evapotranspiration in summer and winter are simulated as 36.80%, 33.08% and 222.40 mm, 59.95 mm, respectively. From this result, when we need high resolution hydrometeorological components, energy balance analysis is more reasonable than water balance analysis. And this results will be used for monitor and forecast of weather disaster like flood and draught using spatial hydrometeorological information.

본 연구는 TOPLATS 지표해석모형의 물수지와 에너지수지 해석에 따른 수문기상성분 비교를 통해 그 적용성을 평가하는데 목적이 있다. 대상지역은 낙동강유역을 선정하였으며 2003~2012년에 대해 1시간, 1 km의 고해상도 수문기상성분을 산출하였다. 안동댐과 합천댐유역의 관측 일/월단위 댐유입량과 모의유량 비교하여 두 유역의 모의치가 관측값과 유사함을 보였다. 또한 C3와 C4지점의 에너지성분에 대한 Diurnally 분석을 수행한 결과 에너지수지 해석에 따른 순복사량, 현열, 잠열의 일중 변화패턴이 물수지 결과에 비해 정확도가 높은 것으로 나타났다. 특히 C4지점의 순복사량과 잠열의 평균제곱근 오차는 각각 22.18 $W/m^2$와 7.27 $W/m^2$로 매우 낮게 나타났다. 여름철과 겨울철의 계절평균 토양수분과 증발산량은 각각 36.80%, 33.08%와 222.40 mm, 59.95 mm로 산정되었다. 이상의 결과로부터 고해상도의 수문기상성분 모의 시 에너지수지 해석방법을 이용하는 것이 더 합리적인 것으로 판단되며 본 연구 결과는 공간수문기상정보를 활용한 홍수 및 가뭄 등의 재해기상 감시 및 예측에 활용할 수 있을 것으로 판단된다.

Keywords

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