Between 1961 and 1990, Vienna experienced on average 9.6 heat days per year. From 1981 to 2010, the number of heat days rose to 15. According to forecasts, there will be an average of 19 hot days between 2021 and 2050, and 41 between 2071 and 2100. Moreover, the population is expected to increase from 1.8 million to 2 million by 2029. To protect the population from the consequences of heat events, the Energy Planning department of Vienna decided to take action.
EXPOSURE is measured by studying and quantifying the occurence of high temperatures within the city between 2015 and 2019
SENSITIVITY is measuring the population density for individual younger than 17 and older than 65.
ADAPTIVE CAPACITY highlights greeneries and water-bodies. It is the ability of the ecosystem to cope with heat events.
RESULTS AND ACTIONS
The top 10 districts have been ranked based on their average Urban Heat Vulnerability Index. These districts present a very little vegetation. The map also shows that even in less urbanized areas, heat vulnerability points are likely to appear. Through the study, we found that by 2050, Vienna will heat up to 8 degrees if no action is taken.
Vienna is developing „Cool Streets“: places for people to stay outdoors, play games, and socialise. This program intends to provide additional seating, cooling systems such as mist showers and establish parking ban to allow citizens enjoy the city at its best. After interviewing 518 citizens results showed that „Cool Streets“ was a great success and should be continued next year. The municipality plans to extend this measure to all 23 Viennese districts.
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