5:15 PM - 7:15 PM
[HCG24-P07] Evaluating Urban Greening’s effects on Water Retention and Cooling in East Asia for Climate Change Adaptation
Keywords:Climate change, Urban greening, Green infrastructure
Recent global climate change and rapid urbanization have increased the risk of various environmental problems in cities. Urban greening, a form of green infrastructure, is attracting attention as a climate change adaptation measure because it has two environmental improvement effects: a rainwater retention effect that retains rainfall in the soil and reduces runoff, and a cooling effect that reduces temperatures through evapotranspiration. Although there are many studies that have evaluated these two effects independently, few studies have addressed the synergistic effects of the two effects or evaluated their relative performance. It is believed that a relative evaluation of the two effects is necessary to ensure that they are effective in effectively greening each other without being disadvantaged by either one or the other.
In this study, we aimed to clarify the relative relationship between the rainwater retention and cooling effects of urban greening as a climate change adaptation measure and the differences in the degree of effectiveness among different greening conditions and regional climates. We used a simple land surface model, SMBM, to reproduce urban greening in East Asian cities, which are undergoing significant urbanization, and conceptually evaluated the rainwater retention and cooling effects of greening in the target cities.
The results obtained in this study indicate that the rainwater retention effect is dominant in arid regions, while the cooling effect is dominant in wet regions. The results suggest that the retention and cooling effects depend on the climate and have a trade-off relationship. The results also showed that the degree of both effects can be increased in urban parks where the soil thickness is large. The model also reproduced soil with high water retention properties and irrigation water such as those used in green roofs, and it was found that the introduction of these elements can improve the effectiveness.
We believe that the results of this study are useful in showing the effectiveness and relationship between the two environmental improvement effects of greening, retention and cooling, conceptually, as a preliminary step for local governments and companies that are trying to promote the spread of greening to plan more specific initiatives from the perspective of the characteristics and impacts of each region.
In this study, we aimed to clarify the relative relationship between the rainwater retention and cooling effects of urban greening as a climate change adaptation measure and the differences in the degree of effectiveness among different greening conditions and regional climates. We used a simple land surface model, SMBM, to reproduce urban greening in East Asian cities, which are undergoing significant urbanization, and conceptually evaluated the rainwater retention and cooling effects of greening in the target cities.
The results obtained in this study indicate that the rainwater retention effect is dominant in arid regions, while the cooling effect is dominant in wet regions. The results suggest that the retention and cooling effects depend on the climate and have a trade-off relationship. The results also showed that the degree of both effects can be increased in urban parks where the soil thickness is large. The model also reproduced soil with high water retention properties and irrigation water such as those used in green roofs, and it was found that the introduction of these elements can improve the effectiveness.
We believe that the results of this study are useful in showing the effectiveness and relationship between the two environmental improvement effects of greening, retention and cooling, conceptually, as a preliminary step for local governments and companies that are trying to promote the spread of greening to plan more specific initiatives from the perspective of the characteristics and impacts of each region.