5:15 PM - 6:45 PM
[U02-P01] Assessment of the effects of rooftop greening using high-concentration CO2 from university lecture rooms with remote sensing techniques
Keywords:Carbon dioxide, Rooftop greening, University campus, Insulation effect
Since the advent of human industrialization, there has been a significant increase in the use of fossil fuels, resulting in a surge in greenhouse gas emissions and subsequent global warming. Global efforts are underway to reduce greenhouse gas emissions aiming for carbon neutrality. University campuses, known for their substantial energy consumption, also contribute to carbon dioxide emissions. In this study, rooftop greening, which can be used to secure green spaces, was applied to the campus of Dong-A University located in the city of Busan, South Korea, and carbon dioxide generated in the classroom was used as fertilizer for rooftop greening. The study compared the energy-saving amounts between rooftop gardens supplied with carbon dioxide and those not supplied, based on the building volume in the study area. Additionally, the potential reduction in carbon dioxide achievable through rooftop greening was calculated based on the rooftop area.
ArcGIS software and digital topographic maps (1:5000 scale) were used to calculate the rooftop area and building volume. Using high-resolution aerial imagery, suitable buildings for rooftop greening on the campus were identified, and the evaluated volume of the buildings was 1,071,088m3. It was confirmed that 700-1,000 ppm of carbon dioxide, which increases the growth of vegetation, was generated inside the lecture room. A scaled model experiment was applied to the rooftop greening vegetation (Dendrantema zawadskii) when carbon dioxide was collected inside the lecture room. Through stereo image-based 3D modeling, it was confirmed that vegetation supplied with carbon dioxide exhibited greater growth compared to the unsupplied vegetation. Temperature measurements revealed that vegetation supplied with carbon dioxide had an insulation effect of 0.53°C compared to the unsupplied unsupplied vegetation. Furthermore, we calculated the absorption of carbon dioxide by rooftop greening at Dong-A University Campus. The vegetation, Dendranthema zawadskii, was found to absorb 3.65 kg of carbon dioxide per year per square meter. Assuming 60% greening of the building's rooftop area, rooftop greening was calculated to result in a reduction of 85 tons of carbon dioxide per year.
The results suggest that this approach can be applied not only to university campuses but also to buildings frequently used by people. As demonstrated in this study, carbon dioxide can be utilized as fertilizer to mitigate urban heat islands and reduce carbon dioxide emissions by rooftop greening.
ArcGIS software and digital topographic maps (1:5000 scale) were used to calculate the rooftop area and building volume. Using high-resolution aerial imagery, suitable buildings for rooftop greening on the campus were identified, and the evaluated volume of the buildings was 1,071,088m3. It was confirmed that 700-1,000 ppm of carbon dioxide, which increases the growth of vegetation, was generated inside the lecture room. A scaled model experiment was applied to the rooftop greening vegetation (Dendrantema zawadskii) when carbon dioxide was collected inside the lecture room. Through stereo image-based 3D modeling, it was confirmed that vegetation supplied with carbon dioxide exhibited greater growth compared to the unsupplied vegetation. Temperature measurements revealed that vegetation supplied with carbon dioxide had an insulation effect of 0.53°C compared to the unsupplied unsupplied vegetation. Furthermore, we calculated the absorption of carbon dioxide by rooftop greening at Dong-A University Campus. The vegetation, Dendranthema zawadskii, was found to absorb 3.65 kg of carbon dioxide per year per square meter. Assuming 60% greening of the building's rooftop area, rooftop greening was calculated to result in a reduction of 85 tons of carbon dioxide per year.
The results suggest that this approach can be applied not only to university campuses but also to buildings frequently used by people. As demonstrated in this study, carbon dioxide can be utilized as fertilizer to mitigate urban heat islands and reduce carbon dioxide emissions by rooftop greening.