Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Effects of Differential Heating by Land-Use types on flow and air temperature in an urban area

토지 피복별 차등 가열이 도시 지역의 흐름과 기온에 미치는 영향

  • Park, Soo-Jin (Department of Environmental Atmospheric Sciences, Pukyong National University) ;
  • Choi, So-Hee (Korea Electric Power Corporation Engineering and Construction Company) ;
  • Kang, Jung-Eun (Department of Environmental Atmospheric Sciences, Pukyong National University) ;
  • Kim, Dong-Ju (Department of Environmental Atmospheric Sciences, Pukyong National University) ;
  • Moon, Da-Som (Department of Environmental Atmospheric Sciences, Pukyong National University) ;
  • Choi, Wonsik (Department of Environmental Atmospheric Sciences, Pukyong National University) ;
  • Kim, Jae-Jin (Department of Environmental Atmospheric Sciences, Pukyong National University) ;
  • Lee, Young-Gon (Applied Meteorology Research Division, National Institute of Meteorological Research)
  • 박수진 (부경대학교 환경대기과학과) ;
  • 최소희 (한국전력기술) ;
  • 강정은 (부경대학교 환경대기과학과) ;
  • 김동주 (부경대학교 환경대기과학과) ;
  • 문다솜 (부경대학교 환경대기과학과) ;
  • 최원식 (부경대학교 환경대기과학과) ;
  • 김재진 (부경대학교 환경대기과학과) ;
  • 이영곤 (국립기상과학원 응용기상연구과)
  • Received : 2016.11.01
  • Accepted : 2016.11.21
  • Published : 2016.12.31
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Abstract

In this study, the effects of differential heating by land-use types on flow and air temperature at an Seoul Automated Synoptic Observing Systems (ASOS) located at Songwol-dong, Jongno-gu, Seoul was analyzed. For this, a computation fluid dynamics (CFD) model was coupled to the local data assimilation and prediction system (LDAPS) for reflecting the local meteorological characteristics at the boundaries of the CFD model domain. Time variation of temperatures on solid surfaces was calculated using observation data at El-Oued, Algeria of which latitude is similar to that of the target area. Considering land-use type and shadow, surface temperatures were prescribed in the LDAPS-CFD coupled model. The LDAPS overestimated wind speeds and underestimated air temperature compared to the observations. However, a coupled LDAPS-CFD model relatively well reproduced the observed wind speeds and air temperature, considering complicated flows and surface temperatures in the urban area. In the morning when the easterly was dominant around the target area, both the LDAPS and coupled LDAPS-CFD model underestimated the observed temperatures at the Seoul ASOS. This is because the Kyunghee Palace located at the upwind region was composed of green area and its surface temperature was relatively low. However, in the afternoon when the southeasterly was dominant, the LDAPS still underestimated, on the while, the coupled LDAPS-CFD model well reproduced the observed temperatures at the Seoul ASOS by considering the building-surface heating.

본 연구에서는 기상청 현업 국지기상모델(Local Data Assimilation and Prediction System, LDAPS)과 전산유체역학(Computational Fluid Dynamics, CFD) 모델을 접합하여, 서울 종로구 송월동에 위치한 지동기상관측소(서울 ASOS) 주변 지역의 기상 환경을 분석하였다. 토지 피복별 차등 가열이 도시 지역의 대기 흐름과 기온에 미치는 영향을 분석하기 위하여, 시간 변화에 따른 토지 피복별 지표면 온도와 그림자 영역에 대한 지표면 온도 감소 효과를 고려하였다. LDAPS 모델은 상세한 건물, 지형, 지표면 가열 효과를 고려하지 못하기 때문에, 풍속을 과대모의 하고 기온을 과소 모의하였다. 건물과 지형의 마찰 효과와 태양 복사에 의한 지표면 가열을 고려할 수 있는 LDAPS-CFD 접합 모델은 서울 ASOS 지점의 관측 풍속과 유사한 풍속을 모의하였고, 관측 기온을 잘 재현하였다. 주로 동풍이 부는 오전 시간대에는 LDAPS-CFD 접합 모델 또한 기온을 과소모의 하였는데, 이는 서울 ASOS 지점의 풍상측(동쪽)에 위치한 경희궁 주변 지역에 주로 수목이 분포하고 있고, 표면 온도가 상대적으로 낮기 때문인 것으로 판단된다. 그러나, 주로 남동풍 계열의 바람이 부는 오후 시간대에는 풍상측에 위치한 건물의 표면 가열의 효과로 인해 서울 ASOS 지점의 관측 기온을 상대적으로 잘 모의하였다.

Keywords

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