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SUMMARY:Anthropogenic and natural alterations of shallow groundwater tempe
 ratures - Dr Kathrin Menberg - Research Associate Structures Group
DTSTART:20150220T150000Z
DTEND:20150220T160000Z
UID:TALK57896@talks.cam.ac.uk
CONTACT:Lorna Everett
DESCRIPTION:Shallow subsurface temperatures are influenced by various proc
 esses. In particular\, the thermal environment under urban\, built-up area
 s is profoundly changed by anthropogenic activities. These changes in the 
 urban environment lead to microclimatic changes and increasing atmospheric
  temperatures\, a phenomenon which is commonly referred to as the atmosphe
 ric urban heat island (UHI) effect. A respective anthropogenic warming can
  also be observed in the subsurface\, where elevated groundwater temperatu
 res (GWT) occur in urban aquifers. Several studies reported locally measur
 ed increased GWTs from fast-growing mega-cities\, but also in smaller citi
 es\, significant heat anomalies in the urban groundwater are observed. The
  examination of potential heat sources by analytical modelling reveals tha
 t increased ground surface temperatures and basements of buildings act as 
 dominant drivers for the anthropogenic heat input into the groundwater. Wh
 ile some studies discuss these heat anomalies as beneficial for shallow ge
 othermal energy use\, thermally affected GWT are also likely to have an im
 pact on groundwater quality and thus potentially drinking water quality. F
 urthermore\, atmospheric temperatures in rural areas also exhibit an incre
 asing trend due to climatic changes and influence the temperature conditio
 ns in the subsurface. Statistical analyses of long-term temperature time-s
 eries indicate that shallow aquifers\, which are linked to the atmosphere 
 through the unsaturated zone\, exhibit a pronounced coupling to short-term
  changes in air temperature. Thus\, further atmospheric warming is likely 
 to have a significant influence\, not only on soil temperatures\, but also
  on temperatures of economically important water resources.
LOCATION:Cambridge University Engineering Department\, LR5
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