Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Comparison of Surface Fluxes Based on Landuse Characteristics Near Gangjeong-Goryeong Weir of the Nakdong River

낙동강 강정고령보에서 관측된 플럭스의 지표면에 따른 특성 비교

  • Kahng, Keumah (Applied Meteorological Research Division, National Institute of Meteorological Research) ;
  • Koo, Hae-Jung (Applied Meteorological Research Division, National Institute of Meteorological Research) ;
  • Byon, Jae-Young (Applied Meteorological Research Division, National Institute of Meteorological Research) ;
  • Park, Young-San (Asian Dust Research Division, National Institute of Meteorological Research) ;
  • Jung, Hyun-Sook (Applied Meteorological Research Division, National Institute of Meteorological Research)
  • 강금아 (국립기상연구소 응용기상연구과) ;
  • 구해정 (국립기상연구소 응용기상연구과) ;
  • 변재영 (국립기상연구소 응용기상연구과) ;
  • 박영산 (국립기상연구소 황사연구과) ;
  • 정현숙 (국립기상연구소 응용기상연구과)
  • Received : 2013.08.09
  • Accepted : 2013.09.14
  • Published : 2013.10.31
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Abstract

This study investigates energy fluxes measured near Gangjeong-Goryeong Weir of the Nakdong River of South Korea for more than a year, from July 2011 to September 2012, in order to analyze the applicability of the data for future impact analyses. Each of the two study sites is located in a rural area, surrounded by agricultural fields, and an urban industrial area. Sensible and latent heat fluxes are analyzed according to the wind direction. In the summertime, when the wind blows from the river, sensible heat tends to decrease and latent heat tends to increase at both sites. This result is considered to be caused by moisture transfer from the river. Bowen ratio, energy balance closure, momentum flux, and stability are analyzed as well. The Bowen ratio of the rural agricultural site turns out higher than that of the urban site regardless of the season. The energy balance closure is higher at the agricultural site compared to the urban area, which is mainly due to exclusion of the storage term calculation at the urban site. The momentum flux is greater at the urban site both in winter and summer. The instability lasts longer during daytime and in the summertime, when there is a strong turbulence. The data from these sites are appropriate to be used in analyzing the impact of river in surrounding areas for future studies.

본 연구에서는 낙동강 강정고령보 근처에서 2011년 7월부터 2012년 9월까지 1년 이상 관측된 에너지 플럭스 자료의 분석을 통해 강 주변 농경지와 도시에 따른 플럭스 특징을 알아보고 향후 영향평가에 활용 가능한 자료인지 평가하고자 하였다. 연구 대상지는 농경지로 둘러싸인 시골지역과 도시공단 지역에 위치하였다. 현열 및 잠열 플럭스를 풍향에 따라 분석하였다. 여름에 바람이 강쪽에서 불어올 때 두 관측지점 모두 현열은 감소하고 잠열은 증가하는 형태를 보였다. 이는 강으로부터 전달된 수분에 의한 것으로 파악된다. 보웬비, 에너지 수지 닫힘, 운동량 플럭스, 안정도에 대한 분석 또한 이루어졌다. 두 지점간 보웬비를 비교한 결과 전 계절에 걸쳐 도시 지역의 보웬비가 농경지 지역의 보웬비보다 더 높았다. 에너지 수지 닫힘은 도시 지역에서 더 낮게 나타났는데 이는 도시 지역에서 저장항 계산이 배제되었기 때문으로 보인다. 운동량 플럭스는 여름과 겨울 두 계절 모두 도시 지역에서 더 높게 나타났다. 강한 난류를 보이는 주간과 여름에 불안정한 상태가 장시간 지속되었다. 이들 지점에서 관측된 자료는 향후 강이 주변지역에 미치는 영향에 대한 연구에 사용하기 적절한 것으로 보인다.

Keywords

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