Abstract
In Medan City, the Indonesian largest urban area in Sumatra Island, the extreme temperature events in the past 30 years have become more frequent. This phenomenon causes potential health thread to rapidly growing urban population. Moreover, the situation is likely to become more severe in the future under urban sprawl and climate change. Accordingly, it is imperative to understand the vulnerability of the city to extreme temperature with robust indices and spatial visualization in order to provide a baseline for planning responses to such risk. Thus, this research aims to assess heat vulnerability in Medan City, by developing and applying Heat Vulnerability Index (HVI) based on the commonly used health indicators and Principal Component Analysis (PCA). Spatial visualization of the HVI analysis demonstrated a higher vulnerability within the downtown areas of Medan City, compared with suburbs where the density of built-up areas contributes as the highest factor loading for the index. The positive effect of urban green area also can be shown by the assessment of PCA where the sign of factor loading was negative. Furthermore, our assessment also indicates that the HVI has positive correlation with number of hypertension patient and respiratory disease patient as 0.71 and 0.46, respectively. Though the impacts of heat stress are alarming, the integration of heat-related risk map into the master plan for spatial planning of Medan City have not been taken into consideration. This information will be very useful for local authorities when deciding on targeted campaign of urban climate adaptation, for example, increasing open green space by private sector including green roof top initiative. In addition, one of the HVI components (i.e., Universal Thermal Climate Index) also could assist the heat warning system in the future. However, some limitations existed in this study such as the analysis was at sub-district level instead of finer spatial resolution and the ideal study should include more heat-related illnesses but these data are not currently available in the study area.
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Acknowledgements
We would like to thank Ministry of the Environment Japan for funding the research under the theme of Climate Change Adaptation in Indonesia in collaboration with Ministry of National Development Planning of the Republic of Indonesia (BAPPENAS), and to Indonesian authorities (BMKG and BPS) for providing climatic and statistical data. Also, this research was partially supported by the Japan Society for Promotion of Science (JSPS) through Kakenhi Program (i.e., Award no. 19H0114, PI: Kensuke Fukushi) and JSPS's core-to-core program, Center of Excellence in Health Risk Assessment for Adaptation to Climate Change.
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Appendices
Appendix 1: Energy Consumption in Non-Residential Building (MJ/m2/year)
Type | Electricity | Urban gas |
---|---|---|
Office (including factory) | 788 | 213 |
Department store | 1458 | 438 |
Commodity retail | 1421 | 185 |
Other retail | 1421 | 185 |
Restaurant/cafe | 1418 | 2013 |
Hotel | 1400 | 1431 |
School | 377 | 191 |
Hospital | 996 | 846 |
Others | 836 | 664 |
Appendix 2: Energy Consumption Per Residential Building (MJ/year)
Electricity (MJ/year) | Urban gas (MJ/year) | |
---|---|---|
Single person | 10,497.44882 | 8524.069917 |
Multiple people | 13,672.69638 | 10,784.191 |
Appendix 3: Anthropogenic Resources of Heat
Appendix 4: Heat Vulnerability Index Map
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Setiawati, M.D., Jarzebski, M.P., Fukushi, K. (2021). Heat Vulnerability Index Development and Application in Medan City, Indonesia. In: Djalante, R., Bisri, M.B.F., Shaw, R. (eds) Integrated Research on Disaster Risks. Disaster Risk Reduction. Springer, Cham. https://doi.org/10.1007/978-3-030-55563-4_6
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