The objectives of this study are to investigate the effect of plant type on the roof of a model building on the temperature of the interior space, and to provide the suitable plant species for a green roof. On the roof of scaled model building, grass (GR: Zoysia japonica), sedum (SE: Sedum makinoi Aurea), maekmundong (MM: Liriope platyphylla), and jasanhong (JH: Rhododendron schippenbachii) was planted. From June 28 to August 28, i.e., for 63 days, the internal and external temperature of the model building and the light intensity were measured and compared with the control model building (CON: no plant and substrate on the roof). With increased global radiation, the maximum temperature was increased from 28.2℃ to 51.74℃ for CON, from 27.2℃ to 47.7℃ for GR, from 27.7℃ to 49.3℃ for SE, from 27.9℃ to 48.3℃ for MM, from 27.5℃ to 48.9℃ for RD, whereas the outside temperature increased between 25.5℃ and 34.6℃. A positive linear relationship was observed between global radiation and the internal temperature (r=0.987-0.989) and hence, the temperature difference between the internal and external model building (ΔT) was larger with increased radiation. A positive linear relationship was shown between light intensity and ΔT at difference radiation levels. The regression coefficient was estimated as 0.99-1.00℃/[100W/m2] under 500 J/cm2, 1.10-1.15℃/[100W/m2] at averaged radiation 1,800J/cm2, whereas the large decrease in the coefficient, i.e., 0.76-0.86℃ /[100W/m2] was observed for above 1,800J/cm2 radiation level. The ΔT per unit of light intensity observed a significantly different between treatments. With the planted grass on the roof of the model building, the lowest ΔT per unit solar radiation was observed, which means that the covered roof with grass causes the building internal temperature to be less affected by the sun radiation.

도시화가 진행되면서 인구 과밀화, 대기오염, 녹지의 감소, 에너지의 고갈 등의 문제가 발생하고 있으며 이러한 문제는 도시열섬현상이나 여름철 기온상승을 야기한다.본 연구는 여름철 도시내 자연요소에 의한 기온저감효과를 실증적으로 파악하기 위하여 인터로킹블럭 포장, 점토벽돌포장, 화강석 포장, 회양목 식재, 잔디밭, 연못 등과 같은 지표면 피복재별 복사열을 분석하였으며 중앙분리대 녹음수 식재의온도저감효과를 분석하였다.지표면 피복재의 복사열은 수면, 잔디밭, ILB 포장 순으로 낮게 나타났으며 잔디밭에 비하여 녹음수 아래의 온도가 상대적으로낮았다. 점토벽돌, 화강석 판석, 회양목 식재지를 비교하면 복사열은 회양목 식재지, 점토벽돌, 화강석 포장지 순으로 낮게나타났다. 중앙분리대 녹음수 아래의 기온이 보도, 횡단보도 중앙부분에 비하여 낮게 나타났다.도시온도 저감을 위해서는 평면적 구성에서 수공간과 잔디밭의 확보가 바람직하고 대규모 위주의 입체적 식재가 요구되며또한 포장재의 신중한 고려 및 가로수, 중앙분리대 식재 등 도로상에 대형목 식재의 도입을 검토해야 할것이다.