Hotterdam

How space is making Rotterdam warmer, how this affects the health of its inhabitants, and what can be done about it

Authors

Frank van der Hoeven
Delft University of Technology
https://orcid.org/0000-0001-9308-0828
Alexander Wandl
Delft University of Technology
https://orcid.org/0000-0003-1163-0529

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hotterdam UHI

Synopsis

Heat waves will occur in Rotterdam with greater frequency in the future. Those affected most will be the elderly – a group that is growing in size. In the light of the Paris heat wave of August 2003 and the one in Rotterdam in July 2006, mortality rates among the elderly in particular are likely to rise in the summer.

METHOD

The aim of the Hotterdam research project was to gain a better understanding of urban heat. The heat was measured and the surface energy balance modelled from that perspective. Social and physical features of the city we identified in detail with the help of satellite images, GIS and 3D models. We determined the links between urban heat/surface energy balance and the social/physical features of Rotterdam by multivariable regression analysis. The crucial elements of the heat problem were then clustered and illustrated on a social and a physical heat map.

RESULTS

The research project produced two heat maps, an atlas of underlying data and a set of adaptation measures which, when combined, will make the city of Rotterdam and its inhabitants more aware and less vulnerable to heat wave-related health effects.

CONCLUSION

In different ways, the pre-war districts of the city (North, South, and West) are warmer and more vulnerable to urban heat than are other areas of Rotterdam. The temperature readings that we carried out confirm these findings as far as outdoor temperatures are concerned. Indoor temperatures vary widely. Homes seem to have their particular dynamics, in which the house’s age plays a role. The above-average mortality of those aged 75 and over during the July 2006 heat wave in Rotterdam can be explained by a) the concentration of people in this age group, b) the age of the homes they live in, and c) the sum of sensible heat and ground heat flux. A diverse mix of impervious surfaces, surface water, foliage, building envelopes and shade make one area or district warmer than another. Adaptation measures are in the hands of residents, homeowners and the local council alike, and relate to changing behaviour, physical measures for homes, and urban design respectively.

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van der Hoeven, F., & Wandl, A. (2015). Hotterdam: Hoe ruimte Rotterdam warmer maakt, hoe dat van invloed is op de gezondheid van de inwoners, en wat er aan te doen is. Delft, Nederland: TU Delft Bouwkunde. doi:10.7480//bkbooks/hotterdam/nl

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Keywords:

Hotterdam, urban heat island, climate adaptation, urban design, spatial planning

Forthcoming

26 August 2015

License

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Details about this monograph

ISBN-13 (15)

9789461865120

Date of first publication (11)

2015

Physical Dimensions

210mm x 279mm