【Sub-theme 4(2)】Impact Projection and Evaluation of Climate Change Adaptation Measures for Sustainable Urban Built Environment

Sub-theme leader

TANIKAWA Hiroki (Nagoya University)

Outline

Based on climate change adaptation scenarios, supportive information for the discussion of adaptation plans and measures for buildings and infrastructure facilities will be provided in this study. First, we will analyze and model the stock and flow of buildings and infrastructure facilities (roads, water, sewage, etc.) for Japan, and then examine the impacts of different climate change adaptation scenarios based on spatial information. In order to examine this at the city level, urban structure level, and construction material level, the impact of adaptation scenarios for buildings and infrastructure facilities will be conducted by implementing the targets outlined below ((1)–(4)). From a multifaceted perspective of urban material cycling, energy, construction materials, urban meteorological phenomena, and urban economy, we will consider and further discuss strengthening urban functions and the possible impact on carbon emissions, lifetime change and its impact on opportunities for new technology introduction, and increasing building and infrastructure stock that is vulnerable to climate change.

Goals

• To build a core database for thoroughly understanding the high resolution status of material stock and flow of buildings and infrastructure facilities (town, block, or urban structure level) and to consider adaptation measures in the construction field.
• To clarify the spatiotemporal impact of more severe climate change on buildings and infrastructure facilities (and the impact on establishing a sound-material cycle society, etc.).
• To clarify the impact of materials performance and design methods that constitute buildings and infrastructure facilities in cities.
• To clarify changes in urban weather (especially hot environments in summer) and related economic costs caused by changes in urban spatial configurations such as new construction, demolition, maintenance, and renewal in adaptation scenarios.

Target and plan

The entire country will be analyzed as the target area by combining the following elements with high-resolution data at the town, block, or structure level.

1. Establishment and refinement of spatiotemporal databases related to material stock and flow of buildings and infrastructure facilities
2. Evaluation of durability, recyclability, etc. of construction materials used for buildings and infrastructure facilities.
   a. Concrete
   b. Steel
3. Quantification of impact on buildings and infrastructure facilities based on a common scenario (cooperation with Theme 1).
   a. Impact considering the spatial characteristics of buildings and infrastructure facilities (utilizing the database in (1))
   b. Impact of the durability of buildings and infrastructure facilities (utilizing the results of (2))
   c. Impact of changes in the hot environment (in conjunction with the database in (1))
   d. Economic impact considering new construction, demolition, maintenance, and renewal (cooperation with Theme 5)
4. Examination and proposal of a resilient urban system that can reduce damage.

Adaptation options

• Deterioration and maintenance of buildings and infrastructure and the impact of climate change.
• Impact of climate change adaptation on establishing a sound-material cycle society.
• Impact on the hot environment and resource cycling system along with changes in urban morphology due to adaptation measures.