The heat budget is investigated in the Gumi Reservoir of the Nakdong river. In warm climate season, solar radiation effects play a important role in the change of water temperature. The features of the surface heat balance are almost derived by the latent heat flux and the solar radiation flux. On the other hand, in cold climate season, change of heat stored in the water is mainly dominated by latent and sensible heat transfer between water and air, since flux of solar radiation and loss of outgoing long wave radiation balance approximately. For the annual averages, net flux of radiation, evaporation(latent heat) loss are dominant in the Gumi reservoir. The evaporation losses are dominant from spring to early winter. This means that the Gumi reservoir rolls like a lake of thermal medium or deep depth.

Abstract
 1. 서 론
 2. 자료와 방법
  2.1. 자료
  2.2. 연구 방법
 3. 결 과
  3.1. 기온과 수온의 연 변화
  3.2. 열수지 각 항의 연 변화
 4. 결 론
 감사의 글
 REFERENCES

• 김학윤(계명대학교 지구환경학과, Department Of Global Environment, Keimyung University) | Hak-Yun Kim
• 서광수(부산대학교 지구과학교육과, Department of Earth Science Education, Pusan National University) | Kwang-Su Seo
• 조창범(국립기상과학원 응용기상연구과, Applied Meteorology Research Division, National Institute of Meteorological Research) | Chang-Bum Cho
• 김해동(계명대학교 지구환경학과, Department Of Global Environment, Keimyung University) | Hae-Dong Kim Corresponding author