Unraveling the heat island effect observed in urban groundwater bodies - Definition of a potential natural state

Epting, Jannis and Huggenberger, Peter. (2013) Unraveling the heat island effect observed in urban groundwater bodies - Definition of a potential natural state. Journal of hydrology, Vol. 501. pp. 193-204.

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Official URL: http://edoc.unibas.ch/dok/A6212167

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A superposition of several thermal processes leads to an elevation of groundwater temperatures of up to 9 degrees C above the natural state in the city of Basel, Switzerland. The urban thermal groundwater regime is influenced by: (1) urbanization and annual heating periods; (2) thermal groundwater use; (3) seasonal trends; (4) river-groundwater interaction; and (5) climate change and consequences thereof. The combination of short- and long-term data analysis, including conventional and high-resolution multilevel groundwater temperature monitoring, as well as 3D numerical groundwater flow and heat-transport modeling allowed quantifying the thermal influences on the investigated urban groundwater body. Results facilitate to describe the "present state" of the urban thermal groundwater regime and to derive a "potential natural state" of the investigated groundwater body. The study originated from a request of the executive council to provide a basis for cost estimates of infrastructure adaptation measures necessary to mitigate the impact of climate change. It is shown that the principal trigger for the observed thermal development is not climate change but that local and regional anthropogenic factors are dominating. Although in urban areas, groundwater is increasingly used for cooling purposes; the geothermal potential, resulting from elevated groundwater temperatures, is generally not exploited. The presented approach provides a basis for the setup of combined and thermally balanced heating and cooling systems. (C) 2013 Elsevier B.V. All rights reserved. Hydrogeologie der Nordwestschweiz, Grundwasser in Basel
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Applied Geology (Huggenberger)
UniBasel Contributors:Huggenberger, Peter and Epting, Jannis
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:18 Dec 2015 09:32
Deposited On:31 Jan 2014 09:50

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