3:45 PM - 4:00 PM
[AAS10-02] Heat environment evaluation in Sapporo based on observations and numerical simulation
Keywords:heat environment, wbgt, observation, numerical simulation
In recent years, the deterioration of the heat environment due to climate change and urbanization have caused the increase in health hazards like heatstroke. Even in the relatively cool city of Sapporo, the heat environment will likely change significantly in the future due to rapid redevelopment.
The purpose of this study is to investigate the hot environment in the city center of Sapporo and reproduce the results with a numerical weather model, and to evaluate the future hot environment under the progress of urbanization and global warming. We conducted multi-point observations within a 1-km radius around Sapporo Station and validated the accuracy of an urban meteorological model City-LES[1]. In addition, we carried out the numerical experiments using the model imposing buildings after redevelopment by 2030.
Observations were made on July 29 and July 30, 2022, when high temperatures were recorded in Sapporo. To calculate the heat index WBGT, air temperature, humidity, and black-bulb temperature were observed at five locations in central Sapporo. The relative difference of air temperature and WBGT associated with land use was detected by a combination of mobile and fixed-point observation methods. The results of the validation experiments showed that the model tended to underestimate air temperatures and WBGTs compared to observations, but was able to calculate values that were generally close to observations.
Calculations assuming the year 2030 showed that air temperatures and WBGTs would decrease in the vicinity of the redeveloped building. We will examine this point in terms of turbulent transport around the building.
Reference
1. Ikeda, R., Kusaka, H., Iizuka, S. and Boku, T. 2015. Development of urban meteorological LES model for thermal environment at city scale. In 9th International Conference for Urban Climate, Toulouse, France.
The purpose of this study is to investigate the hot environment in the city center of Sapporo and reproduce the results with a numerical weather model, and to evaluate the future hot environment under the progress of urbanization and global warming. We conducted multi-point observations within a 1-km radius around Sapporo Station and validated the accuracy of an urban meteorological model City-LES[1]. In addition, we carried out the numerical experiments using the model imposing buildings after redevelopment by 2030.
Observations were made on July 29 and July 30, 2022, when high temperatures were recorded in Sapporo. To calculate the heat index WBGT, air temperature, humidity, and black-bulb temperature were observed at five locations in central Sapporo. The relative difference of air temperature and WBGT associated with land use was detected by a combination of mobile and fixed-point observation methods. The results of the validation experiments showed that the model tended to underestimate air temperatures and WBGTs compared to observations, but was able to calculate values that were generally close to observations.
Calculations assuming the year 2030 showed that air temperatures and WBGTs would decrease in the vicinity of the redeveloped building. We will examine this point in terms of turbulent transport around the building.
Reference
1. Ikeda, R., Kusaka, H., Iizuka, S. and Boku, T. 2015. Development of urban meteorological LES model for thermal environment at city scale. In 9th International Conference for Urban Climate, Toulouse, France.