Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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The Analysis of Mesoscale Circulations Characteristics Caused by the Evaporation-Efficiency of Water Retention Pavement

보수성 도로 포장재의 증발효율 변화에 의한 중규모 순환장 특성 분석

  • Kim, In-Su (Expressway and Transportation Research Institute, Korea Expressway Corporation) ;
  • Lee, Soon-Hwan (Institute for Environmental Studies, Pusan National University) ;
  • Kim, Hae-Dong (Department of Environment Disaster System, Keimyung University) ;
  • Suh, Young-Chan (Department of Transportation Engineering, Hanyang University)
  • 김인수 (한국도로공사 도로교통연구원) ;
  • 이순환 (부산대학교 환경문제연구소) ;
  • 김해동 (계명대학교 환경방재시스템학과) ;
  • 서영찬 (한양대학교 교통공학과)
  • Received : 2009.07.07
  • Accepted : 2009.09.15
  • Published : 2009.10.30
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Abstract

Field observation and numerical experiments were conducted to understand the impact of water retention pavement on the surface heat budget and on the regional circulation. The numerical model applied in this study is the atmospheric dynamic model Local Circulation Model (LCM) with two dimensional grid system, and a field observation was carried out under the clear sky and calm conditions of the weather on 19 July 2007. In the field observation, the maximum value of surface temperature on pavement covered with water retention material reached the $41.2^{\circ}C$ at 1430 LST and the values was lower for $16.1^{\circ}C$ than that of asphalt without the material. The Case BET03 assumed to be 0.3 for the surface evaporation efficiency was in good agreement with the observation and its sensible and latent heat fluxes were numerically estimated to be 229 and 227 $W/m^2$, respectively. Results of the numerical experiments demonstrated that the water retention pavement tends to induce the increase of latent heat flux associated with the lower surface temperature and mixing height during the daytime. Discontinuity of latent heat caused by the water retention pavement also tends to promote the development of mesoscale circulation called as land-land breeze or country breeze.

보수성 포장재가 지표면 열수지와 중규모 순환장에 미치는 영향을 파악하기 위하여 수치실험과 야외 관측을 실시하였다. 수치실험에 이용된 모형은 LCM(Local Circulation Model)이며, 야외 관측은 대기가 안정되어 날씨가 맑은 2007년 7월 19일 실시되었다. 야외 관측실험에서 보수성 포장재 지표면 온도의 최대치는 1430 LST에서 $41.2^{\circ}C$이고, 보수성 재료가 도포되어 있지 않은 일반 아스팔트보다 $16.1^{\circ}C$ 낮게 관측되었다. 수치실험에서는 증발효율 0.3을 가정한 case BET03에서 관측과 가장 유사한 값을 나타내었다. 이때 현열과 잠열플럭스는 각각 227 와 229 $W/m^2$이다. 수치실험 결과, 보수성 포장재는 낮은 지표면 온도, 혼합고와 관련된 잠열플럭스를 높이는 경향이 나타난다. 보수성 포장재에 의한 잠열플럭스의 불연속은 교외풍과 같은 중규모 순환장의 발달을 강화시키는 역할을 한다.

Keywords

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