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Deterministic modeling of the impact of underground structures on urban groundwater temperature

Abstract : Underground structures have a major in␣uence on groundwater temperature and have a major contribution on the anthropogenic heat ␣uxes into urban aquifers. Groundwater temperature is crucial for resource management as it can provide operational sustainability indicators for groundwater quality and geothermal energy. Here, a three dimensional heat transport modeling approach was conducted to quantify the thermally affected zone (TAZ, i.e. increase in temperature of more than +0.5 °C) caused by two common underground structures: (1) an impervious structure and (2) a draining structure. These design techniques consist in (1) ballasting the un- derground structure in order to resist hydrostatic pressure, or (2) draining the groundwater under the structure in order to remove the hydrostatic pressure. The volume of the TAZ caused by these underground structures was shown to range from 14 to 20 times the volume of the underground structure. Additionally, the cumulative im- pact of underground structures was assessed under average thermal conditions at the scale of the greater Lyon area (France). The heat island effect caused by underground structures was highlighted in the business center of the city. Increase in temperature of more than +4.5 °C were locally put in evidence. The annual heat ␣ow from underground structures to the urban aquifer was computed deterministically and represents 4.5 GW·h. Considering these impacts, the TAZ of deep underground structures should be taken into account in the geother- mal potential mapping. Finally, the amount of heat energy provided should be used as an indicator of heating po- tential in these areas.
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Submitted on : Thursday, August 30, 2018 - 2:09:37 PM
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Guillaume Attard, Yvan Rossier, Thierry Winiarski, Laurent Eisenlohr. Deterministic modeling of the impact of underground structures on urban groundwater temperature. Science of the Total Environment, Elsevier, 2016, 572, pp.986 - 994. ⟨10.1016/j.scitotenv.2016.07.229⟩. ⟨hal-01864727⟩



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