[논문]가로수와 바닥 포장 표면 알베도의 도시 열 환경 개선 효과

김나연; 김은섭; 윤석환; 박정강; 김상혁; 남상준; 제화준; 이동근

doi:10.13087/kosert.2023.26.1.47

가로수와 바닥 포장 표면 알베도의 도시 열 환경 개선 효과
Impact of Urban Thermal Environment Improvement by Street Trees and Pavement Surface Albedo 원문보기

環境復元綠化 = Journal of the Korean Society of Environmental Restoration Technology, v.26 no.1, 2023년, pp.47 - 59

김나연 (서울대학교 생태조경.지역시스템공학부) , 김은섭 (서울대학교 환경대학원 협동과정 조경학) , 윤석환 (서울대학교 환경대학원 협동과정 조경학) , 박정강 (서울대학교 생태조경.지역시스템공학부) , 김상혁 (서울대학교 생태조경.지역시스템공학부) , 남상준 ((주)현우그린) , 제화준 ((주)현우그린) , 이동근 (서울대학교 농업생명과학대학)

Abstract ▼ AI-Helper

Due to climate change and urbanization, abnormally high temperatures and heat waves are expected to increase in urban and deteriorate thermal comfort. Planting of street trees and changing the albedo of urban surfaces are the strategies for mitigating the thermal environment of urban, and both of these strategies affect the exposure and blocking of radiative fluxes to pedestrians. After measuring the shortwave and longwave radiation according to the ground surface with different albedo and the presence of street trees using the CNR4 net radiometer, this study analyzed the relationship between this two strategies in terms of thermal environment mitigation by calculating the MRT(Mean Radiant Temperature) of each environment. As a result of comparing the difference between the downward shortwave radiation measured under the right tree and at the control, the shortwave radiation blocking effect of the tree increased as the downward shortwave radiation increased. During daytime hours (from 11 am to 3 pm), the MRT difference caused by the albedo difference(The albedo of the surfaces are 0.479 and 0.131, respectively.) on surfaces with no tree is approximately 3.58℃. When tree is present, the MRT difference caused by the albedo difference is approximately 0.49℃. In addition, in the case of the light-colored ground surface with high albedo, the surface temperature was low and the range of temperature change was lower than the surrounding surface with low albedo. This result shows that the urban thermal environment can be midigate through the planting of street trees, and that the ground surface with high albedo can be considered for short pedestrians. These results can be utilized in planning street and open space in urban by choosing surfaces with high albedo along with the shading effect of vegetation, considering the use by various users.

주제어

표/그림 (9)

그림 Figure 1. CNR4 net radiometer measurement sites: (left) 3 CNR4 measurement locations, the front CNR4 is installed in the open space, and the rear two CNR4 are installed under the northern part of the zelkova trees (right) CNR4 installation
그림 Figure 2. measurement position and measurement height of CNR4 net radiometer
표 Table 1. Albedo of ground surface
표 Table 2. Performance ability of thermal imaging catmera (model: FLIR E54 24°)
그림 Figure 3. Examples of four study scenarios for calculating the MRT difference from pedestrian perspective and the resulting shortwave and longwave radiation fluxes effects: (a) above a light-colored ground surface with high albedo, (b) above a dark-colored ground surface with low albedo, (c) a light-colored ground surface with high albedo and a street tree are present together, (d) a dark-colored ground surface with a low albedo and a street tree are present together
그림 Figure 4. Radiation flux calculations in six directions
그림 Figure 5. Changes in downward shortwave radiation during one day and the effect of blocking shortwave radiation of tree
그림 Figure 6. MRT changes during one day in four study scenarios
그림 Figure 7. Observing the surface temperature of the light-colored pavement and surroundings with a thermal imaging camera from 12:00 pm to 15:00 pm

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