Simulation of temperature effects on groundwater flow, contaminant dissolution, transport and biodegradation due to shallow geothermal use

摘要: The quantitative prognosis and assessment of possible impacts temperature changes in groundwater due to the geothermal use shallow subsurface urban regions requires process-based numerical models coupled non-isothermal flow, heat mass transport processes biogeochemical reactive processes. This work therefore aims at developing implementing methods as well required parameterizations simulate effects increases injection a aquifer. Parameter process for fluid solute transport, transfer between aqueous non-aqueous phases, microbial growth contaminant biodegradation are expressed functions this purpose. developed model is implemented OpenGeoSys code applied set benchmark simulations, where thermal borehole exchangers (BHE) simulated an aquifer with TCE contamination residual NAPL source zone. plumes emitted by BHEs result focusing flow viscosity reduction heated water. local increase solubility leads increased emissions from At same time, rates allow higher degradation reductive dechlorination. Results simulations insights into interactions individual potential benefits or conflicts natural attenuation contaminated sites. Also, can be used test cases intercomparison validation codes.