Project

Back to overview

Multi-scale Investigation of Principal Heat Transport Processes in Subsurface Urban Heat Islands

English title Multi-scale Investigation of Principal Heat Transport Processes in Subsurface Urban Heat Islands
Applicant Löw Simon
Number 144288
Funding scheme Project funding (Div. I-III)
Research institution Departement Erdwissenschaften ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Hydrology, Limnology, Glaciology
Start/End 01.05.2013 - 31.10.2016
Approved amount 229'006.00
Show all

All Disciplines (4)

Discipline
Hydrology, Limnology, Glaciology
Other disciplines of Earth Sciences
Geophysics
Other disciplines of Environmental Sciences

Keywords (5)

Monitoring; Urban Heat Island; Groundwater; Geothermics; Simulation

Lay Summary (German)

Lead
Das Zusammenwirken vieler Faktoren, wie z.B. Wärmeabstrahlung von Gebäuden, führt zu einem urbanen Mikroklima mit erhöhten Temperaturen in der Atmosphäre. Während dieses Phänomen der Urbanen Wärmeinseln weitreichend bekannt ist, betrachtet man fast ausschließlich die atmosphärischen Effekte. Allerdings auch im Untergrund entstehen weit ausgedehnte Temperaturanomalien, die sich dynamisch entwickeln und sich ausgehend vom Stadtzentrum sowohl lateral als auch in die Tiefe ausbreiten.
Lay summary

Inhalt und Ziel des Forschungsprojekts

Die wesentlichen Prozesse, die zur Ausbildung von urbanen Wärmeinseln im Untergrund und somit zu einer langfristigen Erwärmung von oberflächennahen Grundwasserleitern führen, sind kaum untersucht. Ziel dieser Arbeit ist nun, mit Hilfe von Modellierung und Feldmessungen am Beispiel von Zürich und Karlsruhe die räumliche und zeitliche Temperaturentwicklung im Untergrund zu untersuchen. Auf dieser Grundlage werden die kontrollierenden Wärmetransportprozesse herausgearbeitet.

Wissenschaftlicher und gesellschaftlicher Kontext des Forschungsprojekts

Die Ergebnisse unserer Arbeit werden neue Einblicke liefern in den Energiehaushalt im Untergrund von Städten. Wir erarbeiten somit eine wichtige Grundlage zur ökologischen Beurteilung von Grundwasser im urbanen Raum. Ebenso bedeutsam ist die Arbeit im Hinblick auf die geothermische Nutzung der Untergrunds in Städten. Erhöhte Temperaturen stellen ein erhöhtes geothermisches Potential dar und werden idealerweise in ein gezieltes Energiemanagement einer Sadt integriert. 

 

Direct link to Lay Summary Last update: 28.11.2012

Responsible applicant and co-applicants

Employees

Publications

Publication
A finite line source model with Cauchy-type top boundary conditions for simulating near surface effects on borehole heat exchangers
Rivera Jaime A., Blum Philipp, Bayer Peter (2016), A finite line source model with Cauchy-type top boundary conditions for simulating near surface effects on borehole heat exchangers, in ENERGY, 98, 50-63.
Extracting past atmospheric warming and urban heating effects from borehole temperature profiles
Bayer Peter, Rivera Jaime A., Schweizer Daniel, Schaerli Ulrich, Blum Philipp, Rybach Ladislaus (2016), Extracting past atmospheric warming and urban heating effects from borehole temperature profiles, in GEOTHERMICS, 64, 289-299.
Influence of spatially variable ground heat flux on closed-loop geothermal systems: Line source model with nonhomogeneous Cauchy-type top boundary conditions
Rivera Jaime A., Blum Philipp, Bayer Peter (2016), Influence of spatially variable ground heat flux on closed-loop geothermal systems: Line source model with nonhomogeneous Cauchy-type top boundary conditions, in APPLIED ENERGY, 180, 572-585.
Analytical simulation of groundwater flow and land surface effects on thermal plumes of borehole heat exchangers
Rivera Jaime A., Blum Philipp, Bayer Peter (2015), Analytical simulation of groundwater flow and land surface effects on thermal plumes of borehole heat exchangers, in APPLIED ENERGY, 146, 421-433.
Ground energy balance for borehole heat exchangers: Vertical fluxes, groundwater and storage
Rivera Jaime A., Blum Philipp, Bayer Peter (2015), Ground energy balance for borehole heat exchangers: Vertical fluxes, groundwater and storage, in RENEWABLE ENERGY, 83, 1341-1351.
Increased ground temperatures in urban areas: Estimation of the technical geothermal potential
Rivera Jaime, Blum Philippe, Bayer Peter, Increased ground temperatures in urban areas: Estimation of the technical geothermal potential, in Renewable Energy.

Collaboration

Group / person Country
Types of collaboration
KIT-IMK, Meteorological Satellite Analysis (MSA) Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Prof.em. Dr. Dr.h.c. Ladislaus Rybach, Director, International Geothermal Association (IGA) Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
em. Prof. Dr. Fritz Stauffer, Institute of Environmental Engineering (ETH Zurich) Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure

Communication with the public

Communication Title Media Place Year
Media relations: radio, television Das Grundwasser wird wärmer Deutschlandfunk International 2015
Media relations: print media, online media Groundwater as a heat reservoir Horizons Western Switzerland German-speaking Switzerland Rhaeto-Romanic Switzerland Italian-speaking Switzerland 2015
Media relations: print media, online media Unterirdisch warm Die Welt International 2015

Abstract

As a result of population growth and urbanization, air temperatures in urban regions are significantly elevated, which is known as the so-called Urban Heat Island (UHI) effect. To a lesser extent, research has been dedicated to the thermal impact on the subsurface. The temperature in the shallow urban subsurface slowly increases with urban development, leading to large-scale thermal ano¬malies underground as well. Now, are these subsurface UHIs a blessing or a curse? On the one hand, elevated ground temperatures might promote the growth of pathogens in groundwater. On the other hand, the amount of heat available in such aquifers offers a great potential to cover energy demands and/or storages in urban areas using it for space heating or cooling by means of geothermal heat pump systems. To take advantage of this potential of urban aquifers, the principal heat transport processes in the subsurface urban heat islands have to be comprehensively understood. Hence, the main objective of this research project is to examine the intensity of subsurface UHIs and to quantify all dominant heat fluxes beneath. As study sites, we selected the two cities, Zurich and Karlsruhe, to be able to distinguish between site-specific and universally valid findings. The collaborative project of the two local partners will also benefit from their complementary expertise in field investigation and simulation. The methodological framework is innovative, uses a multi-scale monitoring strategy and process-based analytical and numerical simulations in anthropogenically influenced environments, together with geophysical/hydro¬geological, statistical, engineering and remote sensing techniques.
-