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| Titel |
Sustainable Management of Urban Heat Islands |
| VerfasserIn |
K. Zhu, S. Rumohr, K.-D. Balke, P. Bayer, P. Blum |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250025990
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| Zusammenfassung |
| In recent years, geothermal energy has become increasingly popular, because it offers a
number of advantages over traditional energy sources based on fossil fuels. It is a renewable
energy source, it is clean and safe for the surrounding environment, and it also
contributes to reduction of CO2 emissions. Geothermal energy systems are recognized as
one of the most efficient heating and cooling systems on the market. Therefore,
there is great chance for future growth of geothermal energy use, particularly in
densely populated urban regions. But there are also drawbacks: In many large cities,
groundwater is heated up by several degrees (~ 5Ë C) compared to the surrounding
areas. Causes might be microclimatic changes in the urban environment and the
heating effect of sewage effluents. In fact, a major role plays overutilization of
the ground as a cooling medium during the hot seasons for the air conditioning of
large office buildings. The focus of this project is set on sustainable geothermal
use in such large and densely populated areas, which are also called “urban heat
islands”.
Previous studies focus on spatial temperature trends in the subsurface, and only a few
have been able to reveal temporal trends, for which long-term measurement records are
needed. This study is dedicated to two German locations: the city of Frankfurt/Main and the
city of Cologne. The purpose of the study in Frankfurt is a comprehensive field investigation
of the spatial temperature variations in the underlying aquifers, while in Cologne the attention
is also on the temporal trends of urban groundwater temperatures. Of particular interest
is not only to develop a sustainable management concept, but also a quantitative
geophysical and hydrogeological assessment. For the city of Frankfurt/Main, the
Hessian Agency for the Environment and Geology (HLUG) provides access to
ongoing, highly spatially resolved field measurement locations. For Cologne, about
40 years old intensive temperature records will be utilized and compared to the
status-quo. Furthermore, major geothermal projects in both cities will be reported and
quantitatively analyzed in order to study the urban anthropogenic impacts. For this,
heat transport models will be set up for at least one city. In site-specific integrative
management strategies a balance between heat extraction and injection is elaborated.
Finally, the findings of these case studies will be translated into a general guidance
for those other urban areas with substantial heat anomalies that exist worldwide. |
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